Hysteresis-free, stable and efficient perovskite solar cells achieved by vacuum-treated thermal annealing of CH3NH3PbI3

Fengxian Xie; Di Zhang; Wallace C. H. Choy

doi:10.1117/12.2187973

9 September 2015 Hysteresis-free, stable and efficient perovskite solar cells achieved by vacuum-treated thermal annealing of CH₃NH₃PbI₃

Fengxian Xie, Di Zhang, Wallace C. H. Choy

Author Affiliations +

Proceedings Volume 9567, Organic Photovoltaics XVI; 95670L (2015) https://doi.org/10.1117/12.2187973
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

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.

Citation Download Citation

Fengxian Xie, Di Zhang, and Wallace C. H. Choy "Hysteresis-free, stable and efficient perovskite solar cells achieved by vacuum-treated thermal annealing of CH₃NH₃PbI₃", Proc. SPIE 9567, Organic Photovoltaics XVI, 95670L (9 September 2015); https://doi.org/10.1117/12.2187973

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