Hysteresis Passivation in Planar Perovskite Solar Cells Utilizing Facile Chemical Vapor Deposition Process and PCBM Interlayer

Chongqiu Yang, Xiaobiao Shan and Tao Xie
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Chongqiu Yang: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Xiaobiao Shan: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Tao Xie: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2019, vol. 12, issue 23, 1-13

Abstract: Low-cost, high-efficiency perovskite solar cells (PSCs) have the distinguished potential to be next commercialized photovoltaic devices. Chemical vapor deposition (CVD) process was regarded as an excellent choice as compared to solution deposition technique, however, the photovoltaic and stable performance of the former lags behind that of the latter. In this work, we propose a facile CVD pattern to fabricate PSCs, substrates covered by lead iodide (PbI 2 ) sandwich-surrounded by the source methyl-ammonium iodide (CH 3 NH 3 I, MAI) powder. Heat and mass transfer, surface reactions are involved in the CVD deposition procedure. Numerical calculations present a uniform distribution of MAI vapor, contributing to homogeneous perovskite films with comparable surface morphologies, crystal structures and photovoltaic performances, despite of the notorious hysteresis. Herein, a PCBM ([6,6]-Phenyl C 61 butyric acid methyl ester) interlayer is introduced before the PbI 2 coating and the CVD process. Results show that even suffered from the torturous CVD procedure, the PCBM interlayer still works to passivating the bulk and interfacial recombination, reducing the hysteresis, improving the grain structure of perovskite films. Hence, the photovoltaic performance of PSCs enhances by 30%, and the filling factor difference between the forward and the reverse scan reduces to 6%.

Keywords: perovskite solar cells; chemical vapor deposition; uniform; recombination; hysteresis passivation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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