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Transport phenomenon of anormalous carriers in ferroelectric-semiconductor coupled solar cell

Shuai Jia-Li Liu Xiang-Xin Yang Biao

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Transport phenomenon of anormalous carriers in ferroelectric-semiconductor coupled solar cell

Shuai Jia-Li, Liu Xiang-Xin, Yang Biao
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  • In recent years, a variety of new-concept solar cells have attracted the attention of many scholars. The CdS-CdTe ferroelectric-semiconductor coupled (FSC) solar cell is a novel concept of photovoltaic device that is designed with ferroelectric nano particles of S-rich CdS1-xTex, which are embedded in the light-absorbing semiconductors of Te-rich CdSyTe1-y. In our previous work, we have developed a two-step process to fabricate a nano-dipole photovoltaic device, including a thin film deposition in vacuum and high-temperature phase segregation at elevated temperature in sequence. The X-ray diffraction (XRD) and high-resolution scanning transmission electric microscopy (STEM) results confirm the formation of S-rich CdS1-xTex particles with a wurtzite structure embedded in a Te-rich CdSyTe1-y film with a zinc blend structure. The localized ferroelectric hysteretic behavior of these particles is confirmed through piezoelectric force microscopy (PFM). Meanwhile, a set of CdS-CdTe FSC devices with a symmetrical structure of ITO/FSC/ITO is fabricated. We observe not only a reasonable photovoltage output on the order of hundreds of mV but also the hysteretic behavior of photovoltage through external electric field post-fabrication. To search for direct evidence of the working mechanism of the FSC solar cell, we further study the film surface micro current distribution of the FSC thin film solar cell. In this work, we adopt the CAFM method to acquire electron distribution of the FSC thin film surface and STEM, the electron diffraction for element distribution, and crystal structure of FSC thin film. Also, Schottky solar cell of FTO/pure CdTe/metal structure which is fabricated by the same process as the FSC solar cell is used as reference sample in the CAFM analysis. In this work, we fabricate the CdS-CdTe FSC film solar cell through a radio-frequency magnetron sputtering method, whose structure is a glass/FTO/CdSTe/back contact (Cu/Au) configuration. In order to enhance the polarization of nano dipole particles in the device, an electric field bias across the FSC film is applied in the high-temperature phase segregation process. Micro-current distribution in CdS-CdTe FSC solar cell is investigated by CAFM. Grain boundaries of the FSC film are found to be non-conductive with high current corridors adjacent to them. And some small particles with diameter about 100 nm are embedded in grain boundaries (GBs) of CdTe grains. By applying positive and opposite voltage separately between measurement tip and TCO of sample, we find that the non-conductive GBs have a strong piezoelectric response, which are most likely S-rich CdS1-xTex in wurtzite structure. By contrast with pure CdTe film, the possibility that the non-conductive particles are CdCl2 residuals is excluded. We also find by STEM that many particles with sizes about 100-200 nm are embedded in FSC thin film, mostly at the GBs. The XRD results confirm that the small particles are S-rich CdS1-xTex particles with a wurtzite structure and the big grains are Te-rich CdSyTe1-y with a zinc blend structure. We could conclude reasonably that the small particles observed in CAFM image probably are S-rich CdS1-xTex:The apparent correlation between the carrier transport channel and nano-dipole material is also established. An interesting discovery from such devices is that such cells exhibit performance improvement over time in months after storage with encapsulation in ambient environment. A linear relationship between Voc and the external field strength is observed and the best conversion efficiency is improved from 11.3% to 13.2% further after 6-month storage. We believe that all these microscopic and macroscopic evidences are consistent with the FSC photovoltaic mechanism.
      Corresponding author: Liu Xiang-Xin, shinelu@mail.iee.ac.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61274060), 100 Talents Program of IEE CAS (Grant No. Y010411C41), 100 Talents Preferred Support Plan of the CAS (Grant No. Y210431C41) and the National High Technology Research and Development Program of China (Grant No. 2015AA050609).
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    Diana S, Victor K G 2008 33th IEEE Photovoltaic Specialists Conference San Diego, CA, USA, May 11-16 2008 p1

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    Yang B, Liu X X, Li H 2015 Acta Phys. Sin. 64 038807 (in Chinese) [杨彪, 刘向鑫, 李辉 2015 物理学报 64 038807]

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    Liu X X 2014 High Power Conv. Technol. 3 10 (in Chinese) [刘向鑫 2014 大功率变流技术 3 10]

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    Li H M, Zhu J G, Zhuang J, Lin Y H, Wu Y P, Zhou Y 2014 Func. Mater. s1 25 (in Chinese) [李海敏, 朱建国, 庄稼, 林元华, 武元鹏, 周莹 2014 功能材料 s1 25]

    [6]

    Li J D, Li Z Q, Lu X L, Shen H 2000 Acta Phys. Sin. 49 160 (in Chinese) [李景德, 李智强, 陆夏莲, 沈韩 2000 物理学报 49 160]

    [7]

    Chen B, Li M, Liu Y W, Zuo Z H, Zhuge F, Zhan Q F, Li R W 2011 Nanotechnology 22 195201

    [8]

    Nechache R, Harnagea C, Li S, Cardenas L, Huang W, Chakrabartty J, Rosei F 2015 Nat. Photon. 9 61

    [9]

    Chen H W, Sakai N, Ikegami M, Miyasaka T 2015 J. Phy. Chem.Lett. 6 935

    [10]

    Michele G, Matteo P, Vittoria R, Aurora R, Giuseppe G, Annamaria P, Guglielmo L 2012 Nanoscale 4 1728

    [11]

    Buhbut S, Itzhakov S, Hod I, Dan O, Zaban A 2013 Nano Lett. 13 4456

    [12]

    Huang F, Liu X, Wang W J 2015 Prog. Photovolt: Res. Appl. 23 319

    [13]

    Huang H, Liu X 2013 Appl. Phys. Lett. 102 103501

    [14]

    Li H, Liu X, Lin Y S, Yang B, Du Z M 2015 Phys. Chem. Chem. Phys. 17 11150

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    Sadewasser S, Glatzel T, Rusu M, Jger-Waldau A, Lux-Steiner M C 2002 Appl. Phys. Lett. 80 2979

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    Niles D W, Waters D, Rose D 1998 Appl. Surf. Sci. 136 221

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  • [1]

    Diana S, Victor K G 2008 Appl. Phys. Lett. 92 053507

    [2]

    Diana S, Victor K G 2008 33th IEEE Photovoltaic Specialists Conference San Diego, CA, USA, May 11-16 2008 p1

    [3]

    Yang B, Liu X X, Li H 2015 Acta Phys. Sin. 64 038807 (in Chinese) [杨彪, 刘向鑫, 李辉 2015 物理学报 64 038807]

    [4]

    Liu X X 2014 High Power Conv. Technol. 3 10 (in Chinese) [刘向鑫 2014 大功率变流技术 3 10]

    [5]

    Li H M, Zhu J G, Zhuang J, Lin Y H, Wu Y P, Zhou Y 2014 Func. Mater. s1 25 (in Chinese) [李海敏, 朱建国, 庄稼, 林元华, 武元鹏, 周莹 2014 功能材料 s1 25]

    [6]

    Li J D, Li Z Q, Lu X L, Shen H 2000 Acta Phys. Sin. 49 160 (in Chinese) [李景德, 李智强, 陆夏莲, 沈韩 2000 物理学报 49 160]

    [7]

    Chen B, Li M, Liu Y W, Zuo Z H, Zhuge F, Zhan Q F, Li R W 2011 Nanotechnology 22 195201

    [8]

    Nechache R, Harnagea C, Li S, Cardenas L, Huang W, Chakrabartty J, Rosei F 2015 Nat. Photon. 9 61

    [9]

    Chen H W, Sakai N, Ikegami M, Miyasaka T 2015 J. Phy. Chem.Lett. 6 935

    [10]

    Michele G, Matteo P, Vittoria R, Aurora R, Giuseppe G, Annamaria P, Guglielmo L 2012 Nanoscale 4 1728

    [11]

    Buhbut S, Itzhakov S, Hod I, Dan O, Zaban A 2013 Nano Lett. 13 4456

    [12]

    Huang F, Liu X, Wang W J 2015 Prog. Photovolt: Res. Appl. 23 319

    [13]

    Huang H, Liu X 2013 Appl. Phys. Lett. 102 103501

    [14]

    Li H, Liu X, Lin Y S, Yang B, Du Z M 2015 Phys. Chem. Chem. Phys. 17 11150

    [15]

    Sadewasser S, Glatzel T, Rusu M, Jger-Waldau A, Lux-Steiner M C 2002 Appl. Phys. Lett. 80 2979

    [16]

    Niles D W, Waters D, Rose D 1998 Appl. Surf. Sci. 136 221

    [17]

    Romeo N, Bosio A, Tedeschi R, Canevari V 2000 Mater. Chem. Phys. 66 201

    [18]

    Mccandless B E, Hanket G M, Jensen D G, Birkmire R W 2002 J. Vac. Sci. Technol. 20 1462

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Publishing process
  • Received Date:  25 January 2016
  • Accepted Date:  26 February 2016
  • Published Online:  05 June 2016

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