Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Improvement of current characteristic of perovskite solar cells using dodecanedioic acid modified TiO2 electron transporting layer

Du Xiang Chen Si Lin Dong-Xu Xie Fang-Yan Chen Jian Xie Wei-Guang Liu Peng-Yi

Improvement of current characteristic of perovskite solar cells using dodecanedioic acid modified TiO2 electron transporting layer

Du Xiang, Chen Si, Lin Dong-Xu, Xie Fang-Yan, Chen Jian, Xie Wei-Guang, Liu Peng-Yi
PDF
Get Citation
  • In the classical planar heterojunction perovskite solar cells (PSCs), the electron conducting TiO2 layer shows lower conductivity than the hole transporting materials such as spiro-OMeTAD, which becomes one of the key problems in improving the power conversion efficiency (PCE) of PSCs. In this study, the surface of compact TiO2 layer is modified by a thin self-assembled dodecanedioic acid (DDDA) molecular layer. The TiO2 substrates are immersed into the DDDA solution for 0.5, 2.5, 4.5, 22 h, respectively. It is found that the PCE of PSCs is improved when using the DDDA modified TiO2, showing optimized PCE of 15.35%0.75% under AM 1.5G illumination at 100 mWcm-2 after 4.5 h modification. The short current density (JSC) of the best device is improved from 20.34 mA cm-2 to 23.28 mA cm-2, with the PCE increasing from 14.17% to 15.92%. And it is found that the hysteresis of the PSC is also reduced remarkably with hysteresis index decreasing from 0.4288 to 0.2430. In the meantime, the device with DDDA modification shows a significant improvement in light stability, keeping 71% of its initial PCE value after 720 min exposure under AM 1.5G illumination at 100 mW cm-2 without encapsulation. As a contrast, the device without DDDA modification keeps 59% of its initial PCE value under the same condition. To reveal the mechanism, we investigate the surface energy level change using ultraviolet photoemission spectroscopy. It is found that after DDDA modification, the valence-band maximum energy (EVBM) of TiO2 decreases from -7.25 eV to -7.32 eV, and the conduction-band minimum energy (ECBM) of TiO2 from -4.05 eV to -4.12 eV. The shifting of energy level optimizes the energy level alignment at the interface between the TiO2 and perovskite. It promotes the transport of electrons from perovskite layer to compact TiO2 layer and obstructs the transport of holes from perovskite layer to compact TiO2 layer more effectively. In addition, the decrease of ECBM implies the increase of conductivity of TiO2. We further design a series of electrical experiments, and confirm that the modification improves the conductivity of TiO2 obviously with both contact resistance and thin-film resistance decreasing. In summary, our results indicate the enormous potential of the compact TiO2 layer with a thin self-assembled DDDA molecular layer modification to construct efficient and stable planar heterojunction PSCs for practical applications.
      Corresponding author: Xie Wei-Guang, wgxie@email.jnu.edu.cn;tlpy@jnu.edu.cn ; Liu Peng-Yi, wgxie@email.jnu.edu.cn;tlpy@jnu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61674070, 11574119, 21576301, 51303217, 51373205) and the Science and Technology Planning Project of Guangzhou, China (Grant No. 201605030008).
    [1]

    Kojima A, Teshima K, Shirai Y, Miyasaka T J 2009 Am. Chem. Soc. 131 6050

    [2]

    Lee M M, Teuscher J, Miyasaka T, Murakami T N, Snaith H J 2012 Science 338 643

    [3]

    Kim H S, Lee C R, Im J H, Lee K B, Moehl T, Marchioro A, Moon S J, Humphry-Baker R, Yum J H, Moser J E, Grtzel M, Park N G 2012 Sci. Rep. 2 591

    [4]

    Liu M Z, Johnston M B, Snaith H J 2013 Nature 501 395

    [5]

    Lee J W, Seol D J, Cho A N, Park N G 2014 Adv. Mater. 26 4991

    [6]

    Zhou H P, Chen Q, Li G, Luo S, Song T B, Duan H S, Hong Z R, You J B, Liu Y S, Yang Y 2014 Science 345 542

    [7]

    Yang W S, Noh J H, Jeon N J, Kim Y C, Ryu S, Seo J, Seok S I 2015 Science 348 1234

    [8]

    Saliba M, Matsui T, Domanski K, Seo J Y, Ummadisingu A, Zakeeruddin S M, Correa-Baena J P, Tress W R, Abate A, Hagfeldt A, Grtzel M 2016 Science 354 206

    [9]

    Yang W S, Park B W, Jung E H, Jeon N J, Kim Y C, Lee D U, Shin S S, Seo J, Kim E K, Noh J H, Seok S I 2017 Science 356 1376

    [10]

    Li Y W, Zhao Y, Chen Q, Yang Y, Liu Y S, Hong Z R, Liu Z H, Hsieh Y T, Meng L, Li Y F, Yang Y 2015 J. Am. Chem. Soc. 137 15540

    [11]

    Wang F Z, Tan Z A, Dai S Y, Li Y F 2015 Acta Phys. Sin. 64 038401 (in Chinese) [王福芝, 谭占鳌, 戴松元, 李永舫 2015 物理学报 64 038401]

    [12]

    Stranks S D, Eperon G E, Grancini G, Menelaou C, Alcocer M J P, Leijtens T, Herz L M, Petrozza A, Snaith H J 2013 Science 342 341

    [13]

    Zhao Y X, Nardes A M, Zhu K 2014 J. Phys. Chem. Lett. 5 490

    [14]

    Xing G C, Mathews N, Sun S, Lim S S, Lam Y M, Grtzel M, Mhaisalkar S, Sum T C 2013 Science 342 344

    [15]

    Yao X, Ding Y L, Zhang X D, Zhao Y 2015 Acta Phys. Sin. 64 038805 (in Chinese) [姚鑫, 丁艳丽, 张晓丹, 赵颖 2015 物理学报 64 038805]

    [16]

    Song Z H, Wang S R, Xiao Y, Li X G 2015 Acta Phys. Sin. 64 033301 (in Chinese) [宋志浩, 王世荣, 肖殷, 李祥高 2015 物理学报 64 033301]

    [17]

    Liu P, Yang B C, Liu G, Wu R S, Zhang C J, Wan F, Li Y G, Yang J L, Gao Y L, Zhou C H 2017 Chin. Phys. B 26 058401

    [18]

    Shi J J, Xu X, Li D M, Meng Q B 2015 Small 11 2472

    [19]

    Kumar M H, Yantara N, Dharani S, Graetzel M, Mhaisalkar S, Boix P P, Mathews N 2013 Chem. Commun. 49 11089

    [20]

    Zhang Q F, Dandeneau C S, Zhou X Y, Cao G Z 2009 Adv. Mater. 21 4087

    [21]

    Ariyanto N P, Abdullah H, Syarif J, Yuliarto B, Shaari S 2010 Funct. Mater. Lett. 3 303

    [22]

    Goncalves A S, Ges M S, Fabregat-Santiago F, Moehl T, Davolos M R, Bisquert J, Yanagida S, Nogueira A F, Bueno P R 2011 Electrochim. Acta 56 6503

    [23]

    Liu Y, Xu Z, Zhao S L, Qiao B, Li Y, Qin Z L, Zhu Y Q 2017 Acta Phys. Sin. 66 118801 (in Chinese) [刘毅, 徐征, 赵谡玲, 乔泊, 李杨, 秦梓伦, 朱友勤 2017 物理学报 66 118801]

    [24]

    Ding X J, Ni L, Ma S B, Ma Y Z, Xiao L X, Chen Z J 2015 Acta Phys. Sin. 64 038802 (in Chinese) [丁雄傑, 倪露, 马圣博, 马英壮, 肖立新, 陈志坚 2015 物理学报 64 038802]

    [25]

    Wojciechowski K, Saliba M, Leijtens T, Abate A, Snaith H J 2014 Energy Environ. Sci. 7 1142

    [26]

    Hendry E, Koeberg M, O'Regan B, Bonn M 2006 Nano Lett. 6 755

    [27]

    Savenije T J, Huijser A, Vermeulen M J W, Katoh R 2008 Chem. Phys. Lett. 461 93

    [28]

    Fravventura M C, Deligiannis D, Schins J M, Siebbeles L D A, Savenije T J 2013 J. Phys. Chem. C 117 8032

    [29]

    Chen J Q, Yang D H, Jiang J H, Ma A B, Song D, Ni C Y, Hu M Z 2015 Mater Rev.: Rev. 29 1 (in Chinese) [陈建清, 杨东辉, 江静华, 马爱斌, 宋丹, Ni Chaoying, Hu Michael Z 2015 材料导报: 综述篇 29 1]

    [30]

    Abate A, Leijtens T, Pathak S, Teuscher J, Avolio R, Errico M E, Kirkpatrik J, Ball J M, Docampo P, McPherson I, Snaith H J 2013 Phys. Chem. Chem. Phys. 15 2572

    [31]

    Poplavskyy D, Nelson J 2003 J. Appl. Phys. 93 341

    [32]

    Abrusci A, Stranks S D, Docampo P, Yip H L, Jen A K Y, Snaith H J 2013 Nano Lett. 13 3124

    [33]

    Wojciechowski K, Stranks S D, Abate A, Sadoughi G, Sadhanala A, Kopidakis N, Rumbles G, Li C Z, Friend R H, Jen A K Y, Snaith H J 2014 ACS Nano 8 12701

    [34]

    Wang J X, Bi Z N, Liang Z R, Xu X Q 2016 Acta Phys. Sin. 65 058801 (in Chinese) [王军霞, 毕卓能, 梁柱荣, 徐雪青 2016 物理学报 65 058801]

    [35]

    Burschka J, Pellet N, Moon S J, Baker R H, Gao P, Nazeeruddin M K, Grtzel M 2013 Nature 499 316

    [36]

    Cojocaru L, Uchida S, Sanehira Y, Nakazaki J, Kubo T, Segawa H 2015 Chem. Lett. 44 674

    [37]

    Lao C S, Li Y, Wong C P, Wang Z L 2007 Nano Lett. 7 1323

    [38]

    Xu L, Tang C Q, Qian J 2010 Acta Phys. Sin. 59 2721 (in Chinese) [徐凌, 唐超群, 钱俊 2010 物理学报 59 2721]

    [39]

    Park N G 2013 J. Phys. Chem. Lett. 4 2423

    [40]

    Snaith H J, Abate A, Ball J M, Eperon G E, Leijtens T, Noel N K, Stranks S D, Wang J T, Wojciechowski K, Zhang W 2014 J. Phys. Chem. Lett. 5 1511

    [41]

    Yella A, Heiniger L P, Gao P, Nazeeruddin M K, Grtzel M 2014 Nano Lett. 14 2591

    [42]

    Jeon N J, Noh J H, Kim Y C, Yang W S, Ryu S, Seok S I 2014 Nat. Mater. 13 897

    [43]

    Dualeh A, Moehl T, Tetreault N, Teuscher J, Gao P, Nazeeruddin M K, Grtzel M 2014 ACS Nano 8 362

    [44]

    Mei A Y, Li X, Liu L F, Ku Z L, Liu T F, Rong Y G, Xu M, Hu M, Chen J Z, Yang Y, Grtzel M, Han H W 2014 Science 345 295

    [45]

    Bai Y B, Wang Q Y, L R T, Zhu H W, Kang F Y 2016 Chin. Sci. Bull. 61 489 (in Chinese) [白宇冰, 王秋莹, 吕瑞涛, 朱宏伟, 康飞宇 2016 科学通报 61 489]

    [46]

    Ito S, Tanaka S, Manabe K, Nishino H 2014 J. Phys. Chem. C 118 16995

    [47]

    Fujishima A, Rao T N, Tryk D A 2000 J. Photochem. Photobiol. C 1 1

    [48]

    Leijtens T, Eperon G E, Pathak S, Abate A, Lee M M, Snaith H J 2013 Nat. Commun. 4 2885

    [49]

    Guo X D, Niu G D, Wang L D 2015 Acta Chim. Sin. 73 211 (in Chinese) [郭旭东, 牛广达, 王立铎 2015 化学学报 73 211]

  • [1]

    Kojima A, Teshima K, Shirai Y, Miyasaka T J 2009 Am. Chem. Soc. 131 6050

    [2]

    Lee M M, Teuscher J, Miyasaka T, Murakami T N, Snaith H J 2012 Science 338 643

    [3]

    Kim H S, Lee C R, Im J H, Lee K B, Moehl T, Marchioro A, Moon S J, Humphry-Baker R, Yum J H, Moser J E, Grtzel M, Park N G 2012 Sci. Rep. 2 591

    [4]

    Liu M Z, Johnston M B, Snaith H J 2013 Nature 501 395

    [5]

    Lee J W, Seol D J, Cho A N, Park N G 2014 Adv. Mater. 26 4991

    [6]

    Zhou H P, Chen Q, Li G, Luo S, Song T B, Duan H S, Hong Z R, You J B, Liu Y S, Yang Y 2014 Science 345 542

    [7]

    Yang W S, Noh J H, Jeon N J, Kim Y C, Ryu S, Seo J, Seok S I 2015 Science 348 1234

    [8]

    Saliba M, Matsui T, Domanski K, Seo J Y, Ummadisingu A, Zakeeruddin S M, Correa-Baena J P, Tress W R, Abate A, Hagfeldt A, Grtzel M 2016 Science 354 206

    [9]

    Yang W S, Park B W, Jung E H, Jeon N J, Kim Y C, Lee D U, Shin S S, Seo J, Kim E K, Noh J H, Seok S I 2017 Science 356 1376

    [10]

    Li Y W, Zhao Y, Chen Q, Yang Y, Liu Y S, Hong Z R, Liu Z H, Hsieh Y T, Meng L, Li Y F, Yang Y 2015 J. Am. Chem. Soc. 137 15540

    [11]

    Wang F Z, Tan Z A, Dai S Y, Li Y F 2015 Acta Phys. Sin. 64 038401 (in Chinese) [王福芝, 谭占鳌, 戴松元, 李永舫 2015 物理学报 64 038401]

    [12]

    Stranks S D, Eperon G E, Grancini G, Menelaou C, Alcocer M J P, Leijtens T, Herz L M, Petrozza A, Snaith H J 2013 Science 342 341

    [13]

    Zhao Y X, Nardes A M, Zhu K 2014 J. Phys. Chem. Lett. 5 490

    [14]

    Xing G C, Mathews N, Sun S, Lim S S, Lam Y M, Grtzel M, Mhaisalkar S, Sum T C 2013 Science 342 344

    [15]

    Yao X, Ding Y L, Zhang X D, Zhao Y 2015 Acta Phys. Sin. 64 038805 (in Chinese) [姚鑫, 丁艳丽, 张晓丹, 赵颖 2015 物理学报 64 038805]

    [16]

    Song Z H, Wang S R, Xiao Y, Li X G 2015 Acta Phys. Sin. 64 033301 (in Chinese) [宋志浩, 王世荣, 肖殷, 李祥高 2015 物理学报 64 033301]

    [17]

    Liu P, Yang B C, Liu G, Wu R S, Zhang C J, Wan F, Li Y G, Yang J L, Gao Y L, Zhou C H 2017 Chin. Phys. B 26 058401

    [18]

    Shi J J, Xu X, Li D M, Meng Q B 2015 Small 11 2472

    [19]

    Kumar M H, Yantara N, Dharani S, Graetzel M, Mhaisalkar S, Boix P P, Mathews N 2013 Chem. Commun. 49 11089

    [20]

    Zhang Q F, Dandeneau C S, Zhou X Y, Cao G Z 2009 Adv. Mater. 21 4087

    [21]

    Ariyanto N P, Abdullah H, Syarif J, Yuliarto B, Shaari S 2010 Funct. Mater. Lett. 3 303

    [22]

    Goncalves A S, Ges M S, Fabregat-Santiago F, Moehl T, Davolos M R, Bisquert J, Yanagida S, Nogueira A F, Bueno P R 2011 Electrochim. Acta 56 6503

    [23]

    Liu Y, Xu Z, Zhao S L, Qiao B, Li Y, Qin Z L, Zhu Y Q 2017 Acta Phys. Sin. 66 118801 (in Chinese) [刘毅, 徐征, 赵谡玲, 乔泊, 李杨, 秦梓伦, 朱友勤 2017 物理学报 66 118801]

    [24]

    Ding X J, Ni L, Ma S B, Ma Y Z, Xiao L X, Chen Z J 2015 Acta Phys. Sin. 64 038802 (in Chinese) [丁雄傑, 倪露, 马圣博, 马英壮, 肖立新, 陈志坚 2015 物理学报 64 038802]

    [25]

    Wojciechowski K, Saliba M, Leijtens T, Abate A, Snaith H J 2014 Energy Environ. Sci. 7 1142

    [26]

    Hendry E, Koeberg M, O'Regan B, Bonn M 2006 Nano Lett. 6 755

    [27]

    Savenije T J, Huijser A, Vermeulen M J W, Katoh R 2008 Chem. Phys. Lett. 461 93

    [28]

    Fravventura M C, Deligiannis D, Schins J M, Siebbeles L D A, Savenije T J 2013 J. Phys. Chem. C 117 8032

    [29]

    Chen J Q, Yang D H, Jiang J H, Ma A B, Song D, Ni C Y, Hu M Z 2015 Mater Rev.: Rev. 29 1 (in Chinese) [陈建清, 杨东辉, 江静华, 马爱斌, 宋丹, Ni Chaoying, Hu Michael Z 2015 材料导报: 综述篇 29 1]

    [30]

    Abate A, Leijtens T, Pathak S, Teuscher J, Avolio R, Errico M E, Kirkpatrik J, Ball J M, Docampo P, McPherson I, Snaith H J 2013 Phys. Chem. Chem. Phys. 15 2572

    [31]

    Poplavskyy D, Nelson J 2003 J. Appl. Phys. 93 341

    [32]

    Abrusci A, Stranks S D, Docampo P, Yip H L, Jen A K Y, Snaith H J 2013 Nano Lett. 13 3124

    [33]

    Wojciechowski K, Stranks S D, Abate A, Sadoughi G, Sadhanala A, Kopidakis N, Rumbles G, Li C Z, Friend R H, Jen A K Y, Snaith H J 2014 ACS Nano 8 12701

    [34]

    Wang J X, Bi Z N, Liang Z R, Xu X Q 2016 Acta Phys. Sin. 65 058801 (in Chinese) [王军霞, 毕卓能, 梁柱荣, 徐雪青 2016 物理学报 65 058801]

    [35]

    Burschka J, Pellet N, Moon S J, Baker R H, Gao P, Nazeeruddin M K, Grtzel M 2013 Nature 499 316

    [36]

    Cojocaru L, Uchida S, Sanehira Y, Nakazaki J, Kubo T, Segawa H 2015 Chem. Lett. 44 674

    [37]

    Lao C S, Li Y, Wong C P, Wang Z L 2007 Nano Lett. 7 1323

    [38]

    Xu L, Tang C Q, Qian J 2010 Acta Phys. Sin. 59 2721 (in Chinese) [徐凌, 唐超群, 钱俊 2010 物理学报 59 2721]

    [39]

    Park N G 2013 J. Phys. Chem. Lett. 4 2423

    [40]

    Snaith H J, Abate A, Ball J M, Eperon G E, Leijtens T, Noel N K, Stranks S D, Wang J T, Wojciechowski K, Zhang W 2014 J. Phys. Chem. Lett. 5 1511

    [41]

    Yella A, Heiniger L P, Gao P, Nazeeruddin M K, Grtzel M 2014 Nano Lett. 14 2591

    [42]

    Jeon N J, Noh J H, Kim Y C, Yang W S, Ryu S, Seok S I 2014 Nat. Mater. 13 897

    [43]

    Dualeh A, Moehl T, Tetreault N, Teuscher J, Gao P, Nazeeruddin M K, Grtzel M 2014 ACS Nano 8 362

    [44]

    Mei A Y, Li X, Liu L F, Ku Z L, Liu T F, Rong Y G, Xu M, Hu M, Chen J Z, Yang Y, Grtzel M, Han H W 2014 Science 345 295

    [45]

    Bai Y B, Wang Q Y, L R T, Zhu H W, Kang F Y 2016 Chin. Sci. Bull. 61 489 (in Chinese) [白宇冰, 王秋莹, 吕瑞涛, 朱宏伟, 康飞宇 2016 科学通报 61 489]

    [46]

    Ito S, Tanaka S, Manabe K, Nishino H 2014 J. Phys. Chem. C 118 16995

    [47]

    Fujishima A, Rao T N, Tryk D A 2000 J. Photochem. Photobiol. C 1 1

    [48]

    Leijtens T, Eperon G E, Pathak S, Abate A, Lee M M, Snaith H J 2013 Nat. Commun. 4 2885

    [49]

    Guo X D, Niu G D, Wang L D 2015 Acta Chim. Sin. 73 211 (in Chinese) [郭旭东, 牛广达, 王立铎 2015 化学学报 73 211]

  • [1] Yao Xin, Ding Yan-Li, Zhang Xiao-Dan, Zhao Ying. A review of the perovskite solar cells. Acta Physica Sinica, 2015, 64(3): 038805. doi: 10.7498/aps.64.038805
    [2] Wang Fu-Zhi, Tan Zhan-Ao, Dai Song-Yuan, Li Yong-Fang. Recent advances in planar heterojunction organic-inorganic hybrid perovskite solar cells. Acta Physica Sinica, 2015, 64(3): 038401. doi: 10.7498/aps.64.038401
    [3] Li Shao-Hua, Li Hai-Tao, Jiang Ya-Xiao, Tu Li-Min, Li Wen-Biao, Pan Ling, Yang Shi-E, Chen Yong-Sheng. Quality management of high-efficiency planar heterojunction organic-inorganic hybrid perovskite solar cells. Acta Physica Sinica, 2018, 67(15): 158801. doi: 10.7498/aps.67.20172600
    [4] Liu Wei-Qing, Kou Dong-Xing, Hu Lin-Hua, Dai Song-Yuan. Effect of light path folding on the properties of electron transport in dyesensitized solar cell. Acta Physica Sinica, 2012, 61(16): 168201. doi: 10.7498/aps.61.168201
    [5] Xi Xiao-Wang, Hu Lin-Hua, Xu Wei-Wei, Dai Song-Yuan. Influence of TiCl4 nanoporous TiO2 films on the performance of dye-sensitized solar cells. Acta Physica Sinica, 2011, 60(11): 118203. doi: 10.7498/aps.60.118203
    [6] Liang Lin-Yun, Dai Song-Yuan, Hu Lin-Hua, Dai Jun, Liu Wei-Qing. Effect of TiO2 particle size on the properties of electron transport and back-reaction in dye-sensitized solar cells. Acta Physica Sinica, 2009, 58(2): 1338-1343. doi: 10.7498/aps.58.1338
    [7] Zhao Sheng-Sheng, Xu Yu-Zeng, Chen Jun-Fan, Zhang Li, Hou Guo-Fu, Zhang Xiao-Dan, Zhao Ying. Research progress of crystalline silicon solar cells with dopant-free asymmetric heterocontacts. Acta Physica Sinica, 2019, 68(4): 048801. doi: 10.7498/aps.68.20181991
    [8] Yang Xu-Dong, Chen Han, Bi En-Bing, Han Li-Yuan. Key issues in highly efficient perovskite solar cells. Acta Physica Sinica, 2015, 64(3): 038404. doi: 10.7498/aps.64.038404
    [9] Xiao You-Peng, Wang Tao, Wei Xiu-Qin, Zhou Lang. Physical mechanism and optimal design of silicon heterojunction solar cells. Acta Physica Sinica, 2017, 66(10): 108801. doi: 10.7498/aps.66.108801
    [10] Hari Bala, Shi Lan, Jiang Lei, Guo Jin-Yu, Yuan Guang-Yu, Wang Li-Bo, Liu Zong-Rui. Preparation of lamina-shape TiO2 nanoarray electrode and its electron transport in dye-sensitized solar cells. Acta Physica Sinica, 2011, 60(8): 088101. doi: 10.7498/aps.60.088101
    [11] Chen Xin-Liang, Chen Li, Zhou Zhong-Xin, Zhao Ying, Zhang Xiao-Dan. Progress of Cu2O/ZnO oxide heterojunction solar cells. Acta Physica Sinica, 2018, 67(11): 118401. doi: 10.7498/aps.67.20172037
    [12] Liang Lin-Yun, Dai Song-Yuan, Fang Xia-Qin, Hu Lin-Hua. Research on the electron transport and back-reaction kinetics in TiO2 films applied in dye-sensitized solar cells. Acta Physica Sinica, 2008, 57(3): 1956-1962. doi: 10.7498/aps.57.1956
    [13] Chen Liang, Zhang Li-Wei, Chen Yong-Sheng. Progress in Pb-free and less-Pb organic-inorganic hybrid perovskite solar cells. Acta Physica Sinica, 2018, 67(2): 028801. doi: 10.7498/aps.67.20171956
    [14] Pan Hong-Ying, Quan Zhi-Jue. Effects of p-layer hole concentration and thickness on performance of p-i-n InGaN homojunction solar cells. Acta Physica Sinica, 2019, 68(19): 196103. doi: 10.7498/aps.68.20191042
    [15] Liao Xian-Bo, Zeng Xiang-Bo, Xu Yan-Yue, Zhang Shi-Bin, Diao Hong-Wei, Kong Guang-Lin, Hu Zhi-Hua. Numerical simulation of nc-Si:H/ c-Si heterojunction solar cells. Acta Physica Sinica, 2003, 52(1): 217-224. doi: 10.7498/aps.52.217
    [16] Zhang Yong, Shan Zhi-Fa, Cai Jian-Jiu, Wu Hong-Qing, Li Jun-Cheng, Chen Kai-Xuan, Lin Zhi-Wei, Wang Xiang-Wu. Investigation of inverted metamorphic GaInP/GaAs/In0.3Ga0.7As (1 eV) triple junction solar cells for space applications. Acta Physica Sinica, 2013, 62(15): 158802. doi: 10.7498/aps.62.158802
    [17] Zeng Xiang-An, Ai Bin, Deng You-Jun, Shen Hui. Study on light-induced degradation of silicon wafers and solar cells. Acta Physica Sinica, 2014, 63(2): 028803. doi: 10.7498/aps.63.028803
    [18] Xu Wei-Wei, Dai Song-Yuan, Fang Xia-Qin, Hu Lin-Hua, Kong Fan-Tai, Pan Xu, Wang Kong-Jia. Optimization of photoelectrode introduced to dye-sensitized solar cells by anodic oxidative hydrolysis. Acta Physica Sinica, 2005, 54(12): 5943-5948. doi: 10.7498/aps.54.5943
    [19] Dai Song-Yuan, Kong Fan-Tai, Hu Lin-Hua, Shi Cheng-Wu, Fang Xia-Qin, Pan Xu, Wang Kong-Jia. Investigation on the dye-sensitized solar cell. Acta Physica Sinica, 2005, 54(4): 1919-1926. doi: 10.7498/aps.54.1919
    [20] Zeng Long-Yue, Dai Song-Yuan, Wang Kong-Jia, Kong Fan-Tai, Hu Lin-Hua, Pan Xu, Shi Cheng-Wu. The mechanism of dye-sensitized solar cell based on nanocrystalline ZnO films. Acta Physica Sinica, 2005, 54(1): 53-57. doi: 10.7498/aps.54.53
  • Citation:
Metrics
  • Abstract views:  161
  • PDF Downloads:  99
  • Cited By: 0
Publishing process
  • Received Date:  31 December 2017
  • Accepted Date:  19 February 2018
  • Published Online:  05 May 2018

Improvement of current characteristic of perovskite solar cells using dodecanedioic acid modified TiO2 electron transporting layer

    Corresponding author: Xie Wei-Guang, wgxie@email.jnu.edu.cn;tlpy@jnu.edu.cn
    Corresponding author: Liu Peng-Yi, wgxie@email.jnu.edu.cn;tlpy@jnu.edu.cn
  • 1. Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China;
  • 2. Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou 510275, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 61674070, 11574119, 21576301, 51303217, 51373205) and the Science and Technology Planning Project of Guangzhou, China (Grant No. 201605030008).

Abstract: In the classical planar heterojunction perovskite solar cells (PSCs), the electron conducting TiO2 layer shows lower conductivity than the hole transporting materials such as spiro-OMeTAD, which becomes one of the key problems in improving the power conversion efficiency (PCE) of PSCs. In this study, the surface of compact TiO2 layer is modified by a thin self-assembled dodecanedioic acid (DDDA) molecular layer. The TiO2 substrates are immersed into the DDDA solution for 0.5, 2.5, 4.5, 22 h, respectively. It is found that the PCE of PSCs is improved when using the DDDA modified TiO2, showing optimized PCE of 15.35%0.75% under AM 1.5G illumination at 100 mWcm-2 after 4.5 h modification. The short current density (JSC) of the best device is improved from 20.34 mA cm-2 to 23.28 mA cm-2, with the PCE increasing from 14.17% to 15.92%. And it is found that the hysteresis of the PSC is also reduced remarkably with hysteresis index decreasing from 0.4288 to 0.2430. In the meantime, the device with DDDA modification shows a significant improvement in light stability, keeping 71% of its initial PCE value after 720 min exposure under AM 1.5G illumination at 100 mW cm-2 without encapsulation. As a contrast, the device without DDDA modification keeps 59% of its initial PCE value under the same condition. To reveal the mechanism, we investigate the surface energy level change using ultraviolet photoemission spectroscopy. It is found that after DDDA modification, the valence-band maximum energy (EVBM) of TiO2 decreases from -7.25 eV to -7.32 eV, and the conduction-band minimum energy (ECBM) of TiO2 from -4.05 eV to -4.12 eV. The shifting of energy level optimizes the energy level alignment at the interface between the TiO2 and perovskite. It promotes the transport of electrons from perovskite layer to compact TiO2 layer and obstructs the transport of holes from perovskite layer to compact TiO2 layer more effectively. In addition, the decrease of ECBM implies the increase of conductivity of TiO2. We further design a series of electrical experiments, and confirm that the modification improves the conductivity of TiO2 obviously with both contact resistance and thin-film resistance decreasing. In summary, our results indicate the enormous potential of the compact TiO2 layer with a thin self-assembled DDDA molecular layer modification to construct efficient and stable planar heterojunction PSCs for practical applications.

Reference (49)

Catalog

    /

    返回文章
    返回