Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 8, Pages 1278-1285Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201504190
Keywords
gas-assisted crystallization method; perovskite solar cell; textured morphology
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Funding
- Australian Renewable Energy Agency (ARENA)
- Australian Centre for Advanced Photovoltaics (ACAP)
- Alexander von Humboldt Foundation
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Perovskite-based solar cells are generally assembled as planar structures comprising a flat organoammonium metal halide perovskite layer, or mesoscopic structures employing a mesoporous metal-oxide scaffold into which the perovskite material is infiltrated. To present, little attention has been directed toward the texturing of the perovskite material itself. Herein, a textured CH3NH3PbI3 morphology formed through a thin mesoporous TiO2 seeding layer and a gas-assisted crystallization method is reported. The textured morphology comprises a multitiered nanostructure, which allows for significant improvements in the light harvesting and charge extraction performance of the solar cells. Due to these improvements, average short-circuit current densities for a batch of 28 devices are in excess of 22 mA cm(-2), and the maximum recorded power conversion efficiency is 16.3%. The performance gains concomitant with this textured CH3NH3PbI3 morphology provide further insights into how control of the perovskite microstructure can be used to enhance the cell performance.
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