Abnormal behaviors in stability and crystal of CH3NH3PbI3 in liquid-type perovskite solar cell

Cheng-You Hong^a, Tzu-Chien Wei^a, Tsung-Yu Hsieh^a

^aNational Tsing Hua University (Hsinchu, Taiwan), R418, Department of Chemical Engineering, NTHU, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C., Hsinchu, 30013, Taiwan, Republic of China

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Cheng-You Hong, 335
Publication date: 5th February 2015

Liquid-type perovskite solar cell (PSC), the first developed form in PSC, has been known for facing the hurdle of poor stability which results from the dissolution of CH₃NH₃PbI₃ by the attack of I^-/I₃^--contained liquid electrolyte. However, the study and information on how it happens is very deficient. In this work, two abnormal behaviors in stability and crystal of CH₃NH₃PbI₃ are found. The first is that 4-tert-butylpyridine (tBP) acts as a helper from attacker in liquid-type PSC and a better stability is obtained while tBP exists in I^-/I₃^--contained electrolyte, although sole tBP itself can corrode CH₃NH₃PbI₃. The interaction between tBP and iodine probably accounts for this behavior. And the other abnormal behavior is that the loss of photoelectric conversion characteristics in liquid-type PSC is believed to be owing to dissolution of CH₃NH₃PbI₃, but in contrast, the increment in the crystallinity of CH₃NH₃PbI₃ is evidenced by X-ray diffraction analysis after the contact of CH₃NH₃PbI₃ with liquid electrolyte. At the same time, larger crystal of CH₃NH₃PbI₃ on the top of mesoporous layer can be seen from image by scanning electron microscopy, too. This indicates that CH₃NH₃PbI₃ is dissolved at first, but then precipitate to help the growth of incompletely dissolved crystal. These two abnormal behaviors in liquid-type PSC unveil some unknown information before and can help us to know the fundamentals for its poor stability and to improve the performance of liquid-type PSC in the future.

1. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. Journal of the American Chemical Society 2009, 131(17), 6050-6051. 2. Im, J. H.; Lee, C. R.; Lee, J. W.; Park, S. W.; Park, N. G. 6.5% efficient perovskite quantum-dot-sensitized solar cell. Nanoscale 2011, 3(10), 4088-4093. 3. Zhao, Y.; Zhu, K. Charge transport and recombination in perovskite (CH3NH3)PbI3 sensitized TiO2 solar cells. The Journal of Physical Chemistry Letters 2013, 4(17), 2880-2884. 4. Li, W.; Li, J.; Wang, L.; Niu, G.; Gao, R.; Qiu, Y. Post modification of perovskite sensitized solar cells by aluminum oxide for enhanced performance. Journal of Materials Chemistry A 2013, 1(38), 11735-11740.

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