Microstructure Studies of Hybrid Perovskite Solar Cells
Yi-Bing Cheng a
a Department of Materials Science and Engineering, Monash University
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, Yi-Bing Cheng, presentation 066
Publication date: 7th November 2016

One of the most important factors leading to the rapid advancement of perovskite solar cells is the ability to manipulate the microstructure of the perovskite layer and the adjacent functional layers within the device. Through the manipulation of the solution concentration and degree of supersaturation, it is possible to control the size and morphology of perovskite grains. A non-classical growth mechanism was found in solution-processed thin films containing large perovskite grains. This serves as a useful framework for the design of future perovskite morphologies.

Planar and mesoscopic perovskite architectures were characterized to assess the effect of the perovskite morphology on the charge transport and recombination dynamics. It was found that the large perovskite grains in the planar structure exhibited longer radiative recombination lifetimes as well as faster charge mobilities. But the mesoporous scaffold is more effective at suppressing recombination across the FTO/c-TiO2/perovskite interfaces.

Through proper control of the electron dose and the exposure time in transmission electron microscopy study we have been able to provide direct and unequivocal evidence for the existence and crystallography of twin domains in tetragonal CH3NH3PbI3 thin films. The twin domains range from ~100-300 nm in width and have a twin boundary parallel to {112}. The absence/presence of the twin domains is reversible when cycling through the cubic/tetragonal phase transition.

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