300% Enhancement of Carrier Mobility in Uniaxial‐Oriented Perovskite Films Formed by Topotactic‐Oriented Attachment. Issue 23 (18th April 2017)

• Record Type: Journal Article
• 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
• Is Part Of: Advanced materials. Volume 29:Issue 23(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-18
• Subjects: carrier mobility -- orientation -- perovskite films -- solar cells -- topotactic‐oriented attachment; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201606831
• Languages: English
• ISSNs: 0935-9648

Abstract

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 (≈4 × 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. Abstract : A facile topotactic‐oriented attachment process can produce uniaxially oriented perovskite thin films with micrometer‐grain morphology, high crystallinity, low trap density (≈4 × 10 14 cm −3 ), and fast 9 GHz charge‐carrier mobility (71 cm 2 V −1 s −1 ). The n‐i‐p planar perovskite solar cell exhibits a power conversion efficiency of 19.7% (with stabilized efficiency output of 19.0%).