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Organic-inorganic metal halide perovskite solar cells (PSCs) have been widely studied due to their excellent photoelectric conversion performance, but the inherent chemical instability of CH(NH2)2PbI3 (FAPbI3) hinders its sustainable development. In particular, the surface interface of the membrane has prominent humidity sensitivity due to lower activation energy, the defect of the surface interface has a strong correlation with the film stability, and the treatment result of the defect is one of the key factors to improve the long-term stability. The FAPbI3 suffers phase transition from black perovskite phase to yellow non-perovskite phase at room temperature, and the moisture will accelerate this phase transition. Interface engineering is one of the common methods to improve the stability of perovskite solar cells. In addition to interface engineering, there is a strategy of stacking a two-dimensional (2D) perovskite layer on the surface for interface passivation. However, most of the preparation methods of 2D perovskite layer have limitations. In this work, the full solution method and post-treatment mode of annealing are adopted, the hybrid perovskite solar cells of vitamin perovskite are successfully fabricated. The FAPbI3 perovskite surface is uniformly spin-coated with butylamine iodide (BAI) solution, and the formation of 2D perovskite is driven on the surface of FAPbI3 perovskite. Due to the passivation of surface interface defects by the 2D perovskite layer, the non-radiative recombination of charge carriers is reduced, greatly improving the carrier lifetime. Because of the hydrophobicity of long chain molecules in 2D perovskite, the long-term stability of the device is significantly improved. Consequently, the unencapsulated device containing 2D perovskite layer remains above 80% after operating at room temperature in ambient air with a relative humidity (RH) of 60% for nearly 1000 hours. The 2D perovskite layer can significantly improve the long-term stability of the film without affecting the charge carrier transport performance. This method of improving the stability of the device by constructing 2D perovskite layer is in line with the requirements and development trend of high-quality perovskite solar cells, and is a strategy with great development potential.
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图 1 钙钛矿薄膜中2D相与3D相的示意与表征 (a) 二维钙钛矿薄膜与2D-3D钙钛矿薄膜结构的制备图; (b)—(d) 3D薄膜(对照组)和2D薄膜(实验组, BAI/IPA 0.5 mg/mL)的表征, 其中(b) XRD图谱, (c) 紫外-可见光吸收图谱, (d) 稳态PL图谱
Figure 1. Schematic and characterization of 2D and 3D phases in perovskite films. (a) Preparation diagram of perovskite structure at the interface of 2D and 2D-3D perovskite film (CB, chlorobenzene). (b)–(d) The characterization of 3D film (control) and 2D film (target, with BAI/IPA 0.5 mg/mL): (b) X-ray diffraction patterns; (c) UV-vis absorption spectra; (d) steady-state PL spectra.
图 2 钙钛矿薄膜SEM形貌表征 (a) 3D钙钛矿薄膜的表面; (b) 2D-3D钙钛矿薄膜的表面; (c) 3D钙钛矿薄膜的截面; (d) 2D-3D钙钛矿薄膜的截面
Figure 2. Surface morphology characterization of perovskite film: (a) Surface image of 3D perovskite film; (b) surface image of 2D-3D perovskite film; (c) surface image of 3D perovskite film; (d) surface image of 2D-3D perovskite film.
图 3 电池器件的载流子传输性能分析 (a) 钙钛矿薄膜的瞬态(TRPL)光谱; (b) FTO/ETL (TiO2) /Perovskite/PCBM/Ag结构的纯电子器件空间电荷限制电流(SCLC); (c) 3D与2D-3D钙钛矿器件的暗电流-电压(I-V)特性; (d) 3D与2D-3D钙钛矿器件的电化学阻抗谱(EIS)
Figure 3. Analysis of carrier transport performance of devices: (a) Time-resolved photoluminescence (TRPL) for 3D perovskite film and 2D-3D perovskite film; (b) space charge limited current (SCLC) plots of electron-only devices with an architecture of FTO/ETL (TiO2) /Perovskite/PCBM/Ag based on 3D perovskite film and 2D-3D perovskite film; (c) dark current density-voltage (I-V ) characteristics of 3D perovskite film and 2D-3D perovskite film devices; (d) EIS of devices with 3D perovskite film and 2D-3D perovskite film.
图 4 电池器件的光电性能分析 (a) 钙钛矿太阳能电池的器件结构图; (b) 3D钙钛矿与2D-3D钙钛矿器件的J-V曲线; (c)—(f) 20组钙钛矿器件的光伏性能参数统计图
Figure 4. Analysis of photoelectric performance of devices: (a) Device structure of perovskite solar cells; (b) J-V curves of perovskite solar cells prepared by 3D perovskite film and 2D-3D perovskite film; (c)–(f) statistical distribution of photovoltaic performance of perovskite devices.
图 5 电池器件的稳定性分析 (a) 3D钙钛矿薄膜与2D-3D钙钛矿薄膜的接触角测试; (b) 未封装器件在60%的相对湿度下, 在环境空气中进行近1000 h的PCE稳定性试验; (c)—(e) 3D钙钛矿薄膜与2D-3D钙钛矿薄膜在(c) 加热 (85 ℃)、(d) 高湿度 (RH: 85%)、(e) 光照 (AM 1.5G)下的相应XRD谱图
Figure 5. Stability of devices: (a) Contact angle images of 3D perovskite film and 2D-3D perovskite film; (b) PCE stability test of the unencapsulated devices under 60% relative humidity at ambient air for nearly 1000 h; (c)–(e) XRD patterns of the control and target layers against (c) heat (85 ℃) , (d) moisture (RH: 85%), and (e) light (AM 1.5G).
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[1] Wang Y W, Zhang Y B, Zhang P H, Zhang W Q 2015 Phys. Chem. Chem. Phys. 17 11516
Google Scholar
[2] Wehrenfennig C, Eperon G E, Johnston M B, Snaith H J, Herz L M 2014 Adv. Mater. 26 1584
Google Scholar
[3] Miyata A, Mitioglu A, Plochocka P, Portugall O, Wang J T W, Stranks S D, Snaith H J, Nicholas R J 2015 Nat. Phys. 11 582
Google Scholar
[4] Eperon G E, Stranks S D, Menelaou C, Johnston M B, Herz L M, Snaith H J 2014 Energy Environ. Sci. 7 982
Google Scholar
[5] Du Q G, Shen G, John S 2016 AIP Adv. 6 065002
Google Scholar
[6] 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, Grätzel M, Han H W 2014 Science 345 295
Google Scholar
[7] Yin W J, Shi T T, Yan Y F 2014 Appl. Phys. Lett. 104 063903
Google Scholar
[8] Park N G 2015 Mater. Today 18 65
Google Scholar
[9] Dong Q, Liu F, Wong M K, Tam H W, Djurišić A B, Ng A, Surya C, Chan W K, Ng A M C 2016 ChemSusChem 9 2597
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[10] Lee J W, Kim D H, Kim H S, Seo S W, Cho S M, Park N G 2015 Adv. Energy Mater. 5 1501310
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[11] Meng R, Wu G B, Zhou J Y, Zhou H Q, Fang H, Loi M A, Zhang Y 2019 Chem. A Eur. J. 25 5480
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[12] Wu G B, Zhou J Y, Meng R, Xue B D, Zhou H Q, Tang Z Y, Zhang Y 2019 Phys. Chem. Chem. Phys. 21 3106
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[13] Yang T H, Ma C, Cai W L, Wang S Q, Wu Y, Feng J S, Wu N, Li H J, Huang W L, Ding Z C, Gao L L, Liu S Z, Zhao K 2023 Joule 7 574
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[14] Best Research-Cell Efficiencies https://www.nrel.gov/pv/cell-efficiency.html [2023-10-19]
[15] Wang D, Wright M, Elumalai N K, Uddin A 2016 Sol. Energy Mater. Sol. Cells 147 255
Google Scholar
[16] Philippe B, Park B W, Lindblad R, Oscarsson J, Ahmadi S, Johansson E M J, Rensmo H 2015 Chem. Mater. 27 1720
Google Scholar
[17] Kim H S, Seo J Y, Park N G 2016 ChemSusChem 9 2528
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Google Scholar
[19] Li N X, Niu X X, Chen Q, Zhou H P 2020 Chem. Soc. Rev. 49 8235
Google Scholar
[20] Li X, Hoffman J M, Kanatzidis M G 2021 Chem. Rev. 121 2230
Google Scholar
[21] Tsai H, Nie W, Blancon J C, Stoumpos C C, Asadpour R, Harutyunyan B, Neukirch A J, Verduzco R, Crochet J J, Tretiak S, Pedesseau L, Even J, Alam M A, Gupta G, Lou J, Ajayan P M, Bedzyk M J, Kanatzidis M G, Mohite A D 2016 Nature 536 312
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