Efficient Carrier Separation and Intriguing Switching of Bound Charges in Inorganic鈥揙rganic Lead Halide Solar Cells

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• 作者：Gee Yeong Kim ; Seol Hee Oh ; Bich Phuong Nguyen ; William Jo ; Byeong Jo Kim ; Dong Geon Lee ; Hyun Suk Jung
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：June 18, 2015
• 年：2015
• 卷：6
• 期：12
• 页码：2355-2362
• 全文大小：478K
• ISSN：1948-7185

文摘

We fabricated a mesoporous perovskite solar cell with a 鈭?4% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH₃NH₃Pb(I_0.88,Br_0.12)₃ showed a significant potential barrier bending at the grain boundary and induced passivation. The potential difference value in the x = 0.00 sample is 鈭?0 mV, and the distribution of the positive potential is lower than that of the x = 0.12 sample. We also investigated the polarization and hysteretic properties of the perovskite thin films by measuring the local piezoresponse. Specifically, the charged grain boundaries play a beneficial role in electron鈥揾ole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells.