Journal
NANO ENERGY
Volume 10, Issue -, Pages 10-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.08.015
Keywords
Lead iodide perovskite; Gas-assisted crystallization; Microstructural analysis; Single crystal grains; Planar thin film solar cells
Categories
Funding
- Australian Centre for Advanced Photovoltaics
- Australian Renewable Energy Agency
- Victorian State Government (DBI-VSA)
- Victorian State Government (DPI-ETIS)
- Commonwealth Scientific and Industrial Research Organization through OCE Science Leader positions
- Australian Research Council [FT0990583]
- Melbourne Research Grant Support Scheme
- Australian Research Council (ARC) [DP110104734]
- Tecnai G2 F20 TEM at the MCEM - ARC, Australia [LE110100223]
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The simple planar configuration of organic-inorganic hybrid perovskite solar cells produced by a solution coating process has great potential to be a low-cost and high efficiency photovoltaic technology. However planar perovskite films produced by normal spin coating usually show a dendritic grain morphology giving many gaps in the film, resulting in poor coverage of the substrate and thus a low power conversion efficiency. Here a facile gas-assisted solution processing technique is reported that has changed the kinetics of nucleation and crystal growth of the perovskite during the spin coating, producing very uniform perovskite thin films consisting of densely packed single crystalline grains. This microstructure is an ideal candidate for the p-i-n solar cell device. Planar perovskite solar cells constructed from these films produced a highly reproducible average power conversion efficiency of 15.7 +/- 0.7%. The highest efficiency achieved was 17.0% with a slightly lower steady-state value of 16.5% at the maximum power output of the solar cell. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
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