Journal
ADVANCED MATERIALS
Volume 29, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201606831
Keywords
carrier mobility; orientation; perovskite films; solar cells; topotactic-oriented attachment
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Funding
- U.S. Department of Energy [DE-AC36-08GO28308]
- U.S. DOE SunShot Initiative under the Next Generation Photovoltaics 3 program [DE-FOA-0000990]
- Solar Photochemistry program within the U.S. DOE, Office of Basic Sciences, Office of Science
- National Center for Photovoltaics - U.S. DOE, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2012M3A7B4049989]
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Organic-inorganic perovskites with intriguing optical and electrical properties have attracted significant research interests due to their excellent performance in optoelectronic devices. Recent efforts on preparing uniform and large-grain polycrystalline perovskite films have led to enhanced carrier lifetime up to several microseconds. However, the mobility and trap densities of polycrystalline perovskite films are still significantly behind their single-crystal counterparts. Here, a facile topotactic-oriented attachment (TOA) process to grow highly oriented perovskite films, featuring strong uniaxial-crystallographic texture, micrometer-grain morphology, high crystallinity, low trap density (approximate to 4 x 10(14) cm(-3)), and unprecedented 9 GHz charge-carrier mobility (71 cm(2) V-1 s(-1)), is demonstrated. TOA-perovskite-based n-i-p planar solar cells show minimal discrepancies between stabilized efficiency (19.0%) and reverse-scan efficiency (19.7%). The TOA process is also applicable for growing other state-of-the-art perovskite alloys, including triple-cation and mixed-halide perovskites.
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