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Achievable high Voc of carbon based all-inorganic CsPbIBr2 perovskite solar cells through interface engineering

Abstract

In this work, a simple interface engineering process for SnO2 electron selective layer (ESL) surface passivation employing SnCl2 solution is introduced, where it has successfully reduced the energy loss for high open-circuit voltage (Voc) output and consequently improved the performance of the all-inorganic CsPbIBr2 perovskite solar cells (PSCs). It was found that the surface passivation can effectively suppress the recombination process at the interface between the perovskite and the SnO2 due to higher recombination resistance. The shorter PL decay time is dedicated to the more excellent electron extraction from the perovskite film. After optimizing the surface passivation, the power conversion efficiency (PCE) was enhanced from 4.73% to 7.00% and a high Voc of 1.31 V was achieved, which is one of the highest Voc reported for the inorganic Cs-based PSCs. More importantly, the passivated SnO2 based device retains 95.5% of its initial performance at 90 oC in the air without encapsulation. This work provides a simple and efficient interface engineering method to improve the Voc and efficiency of all-inorganic PSCs.

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Publication details

The article was received on 12 Oct 2018, accepted on 28 Nov 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA09838G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Achievable high Voc of carbon based all-inorganic CsPbIBr2 perovskite solar cells through interface engineering

    Z. Guo, S. H. H. Teo, Z. Xu, C. Zhang, Y. Kamata, S. Hayase and T. Ma, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09838G

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