300% Enhancement of Carrier Mobility in Uniaxial-Oriented Perovskite Films Formed by Topotactic-Oriented Attachment
- Authors
- Kim, Dong Hoe; Park, Jaehong; Li, Zhen; Yang, Mengjin; Park, Ji-Sang; Park, Ik Jae; Kim, Jin Young; Berry, Joseph J; Rumbles, Garry; Zhu, Kai
- Issue Date
- Jun-2017
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- carrier mobility; orientation; perovskite films; solar cells; topotactic-oriented attachment
- Citation
- ADVANCED MATERIALS, v.29, no.23
- Journal Title
- ADVANCED MATERIALS
- Volume
- 29
- Number
- 23
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146977
- DOI
- 10.1002/adma.201606831
- ISSN
- 0935-9648
1521-4095
- Abstract
- 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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