Impact of Perovskite Film Morphology and Grain Boundary on Perovskite Solar Cells
Kai Zhu a
a National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado, 80401, United States
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker, Kai Zhu, presentation 098
Publication date: 7th November 2016

Organic-inorganic hybrid halide perovskites (e.g., CH3NH3PbI3 or MAPbI3) have recently emerged as a new class of light absorbers that have demonstrated a rapid progress for solar cell applications. The certified solar conversion efficiencies have reached >22% for a small-area (~0.1 cm2) device and close to 20% for a device with 1-cm2 active area. Despite the rapid progress demonstrated by these light absorbers, there is still a lack of understanding of some fundamental material/physical/chemical properties of these materials. Here I will discuss our recent studies toward a better understanding and control of perovskite nucleation, grain growth, and microstructure evolution using solution processing [1,2]. The precursor chemistry and growth conditions are found to affect significantly the structural and electro-optical properties of perovskite thin films. Our recent study shows that a simple post-growth MABr treatment to the perovskite MAPbI3 thin films can induce substantial grain coarsening via Ostwald ripening, leading to much improved film properties regardless of the initial film quality (e.g., pinholes and grain size). Thus, this new chemical approach enhances processing tolerance to the initial perovskite film quality and improves the reproducibility of device fabrication. The impact of grain boundary on charge transport and recombination as well as on perovskite stability will be discussed. In addition, I will briefly discuss our recent investigation on stabilizing perovskite structures by tuning tolerance factor through solid state alloying [3]. These results and others will be discussed. 


[1] M. Yang, Y. Zhou, Y. Zeng, C.-S. Jiang, N. P. Padture, K. Zhu, Adv. Mater. (2015) 27, 6363;  [2] M. Yang, T. Zhang, P. Schulz, Z. Li, G. Li, D. H. Kim, N. Guo, J. J. Berry, K. Zhu, Y. Zhao, Nat Commun (2016), 7, 12305;  [3] Z. Li, M. J. Yang, J. S. Park, S. H. Wei, J. J. Berry, K. Zhu, Chem. Mater. (2016) 28, 284.

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