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Proceedings Paper

Hysteresis-free, stable and efficient perovskite solar cells achieved by vacuum-treated thermal annealing of CH3NH3PbI3
Author(s): Fengxian Xie; Di Zhang; Wallace C. H. Choy
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Paper Abstract

The lead halide-based perovskite solar cells have emerged as a promising candidate in photovoltaic applications. However, the precise control over the morphologiy of the perovskite films (minimizing pore formation) and enhanced stability and reproducibility of the devices remain challenging, even though both will be necessary for further advancements. Here we introduce vacuum-assisted thermal annealing as a means of controlling the composition and morphology of the CH3NH3PbI3 films formed from PbCl2 and CH3NH3I as precursors. We identify the critical role that the CH3NH3Cl generated as a byproduct during the pervoskite synthesis plays for the photovoltaic performance of the perovskite film. Removing this byproduct through vacuum-assisted thermal annealing we succeeded in producing pure, pore-free planar CH3NH3PbI3 films showing high conversion efficiency (PCE) reaching 14.5%). Removal of CH3NH3Cl strongly attenuate the photocurrent hysteresis.

Paper Details

Date Published: 9 September 2015
PDF: 3 pages
Proc. SPIE 9567, Organic Photovoltaics XVI, 95670L (9 September 2015); doi: 10.1117/12.2187973
Show Author Affiliations
Fengxian Xie, The Univ. of Hong Kong (Hong Kong, China)
Di Zhang, The Univ. of Hong Kong (Hong Kong, China)
Wallace C. H. Choy, The Univ. of Hong Kong (Hong Kong, China)

Published in SPIE Proceedings Vol. 9567:
Organic Photovoltaics XVI
Zakya H. Kafafi; Paul A. Lane; Ifor D. W. Samuel, Editor(s)

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