Efficient Carrier Separation and Intriguing Switching of Bound Charges in Inorganic–Organic Lead Halide Solar Cells

We fabricated a mesoporous perovskite solar cell with a ∼14% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH3NH3Pb­(I0.88,Br0.12)3 showed a significant potential barrier bending at...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2015-06, Vol.6 (12), p.2355-2362
Main Authors: Kim, Gee Yeong, Oh, Seol Hee, Nguyen, Bich Phuong, Jo, William, Kim, Byeong Jo, Lee, Dong Geon, Jung, Hyun Suk
Format: Article
Language:English
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Summary:We fabricated a mesoporous perovskite solar cell with a ∼14% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH3NH3Pb­(I0.88,Br0.12)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 ∼50 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–hole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.5b00967