Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Recent advances in organolead halide perovskite solar cells have led to a remarkable improvement in the cell efficiency [1]. Yet, it is still challenging to achieve good moisture resistance of the perovskite films while obtaining high cell efficiency [2, 3, 4]. Here we address the issue through a simple post-deposition passivation treatment of perovskite films with small-sized amine molecules containing benzene rings [5]. We compared three structurally similar aromatic molecules, including aniline, benzylamine and phenethylamine, and observed a drastic difference in their passivation effect. Through density functional theory calculations we found that the efficacy of the moisture resistance and defect passivation is extremely sensitive to the steric arrangement of the amine molecules and that only benzylamine provides the optimal configuration. Solar cells based on benzylamine modified formamidinium lead iodide (FAPbI3) perovskite films exhibit a champion efficiency of 19.2% and an open-circuit voltage (Voc) of 1.12 V, revealing extremely low loss-in-potential (0.36 eV) in the cells. The modified FAPbI3 films exhibit no degradation in their structural and electronic properties after >2800 hours air exposure. The study elucidates the molecular passivation principles to achieve simultaneous efficiency and stability improvement.
References
[1] M. A. Green, A. Ho-Baillie and H. J. Snaith, Nat. Photonics (2014), 8, 506.
[2] X. Li, M. I. Dar and C. Y. Yi, et al. Nat. Chem. (2015), 7, 703.
[3] S. Yang, Y. Wang and P. Liu, et al. Nature Energy (2016), 1, 15016.
[4] I. C. Smith, E. T. Hoke and D. Solis-Ibarra, et al. Angew. Chem. Int. Edit. (2014), 53, 11232;
[5] F. Wang, W. Geng and Y. Zhou, et al. Adv. Mater. DOI:10.1002/adma.201603062.
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