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Issue 27, 2015
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A low temperature gradual annealing scheme for achieving high performance perovskite solar cells with no hysteresis

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Abstract

CH3NH3PbI3 is commonly used in perovskite solar cells due to its long diffusion length and good crystallinity. In this paper, in the one-step approach using CH3NH3I and PbCl2 for forming the perovskite, we present a new low temperature annealing approach of gradually increasing the temperature to fabricate perovskite films. Various temperatures and temperature ranges for the formation of perovskite films have been studied. Using the gradual annealing process, we can tune the amount of chlorine in the atomic ratio of chlorine/iodine from 1.2 to 4.0%. Meanwhile, the gradual annealing process influences the quality of the perovskite film and importantly the device performance. The results show that through the optimized process, the film quality is improved with high surface coverage and good photoluminescence and reproducibility. We find that a higher amount of chlorine in the perovskite film plays a positive role in the device performance in the approach for achieving a power conversion efficiency of 14.9% with no obvious hysteresis.

Graphical abstract: A low temperature gradual annealing scheme for achieving high performance perovskite solar cells with no hysteresis

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Supplementary files

Article information


Submitted
15 Apr 2015
Accepted
05 Jun 2015
First published
08 Jun 2015

J. Mater. Chem. A, 2015,3, 14424-14430
Article type
Paper

A low temperature gradual annealing scheme for achieving high performance perovskite solar cells with no hysteresis

M. Xu, H. Zhang, S. Zhang, H. L. Zhu, H. Su, J. Liu, K. S. Wong, L. Liao and W. C. H. Choy, J. Mater. Chem. A, 2015, 3, 14424
DOI: 10.1039/C5TA02730F

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