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- Title
Self‐Assembled Perovskite Nanoislands on CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Cuboid Single Crystals by Energetic Surface Engineering.
- Authors
Zhang, Yurou; Kim, Dohyung; Yun, Jung‐Ho; Lim, Jongchul; Jung, Min‐Cherl; Wen, Xiaoming; Seidel, Jan; Choi, Eunyoung; Xiao, Mu; Qiu, Tengfei; Lyu, Miaoqiang; Han, EQ; Ghasemi, Mehri; Lim, Sean; Snaith, Henry J.; Yun, Jae Sung; Wang, Lianzhou
- Abstract
Organometal perovskite single crystals have been recognized as a promising platform for high‐performance optoelectronic devices, featuring high crystallinity and stability. However, a high trap density and structural nonuniformity at the surface have been major barriers to the progress of single crystal‐based optoelectronic devices. Here, the formation of a unique nanoisland structure is reported at the surface of the facet‐controlled cuboid MAPbI3 (MA = CH3NH3+) single crystals through a cation interdiffusion process enabled by energetically vaporized CsI. The interdiffusion of mobile ions between the bulk and the surface is triggered by thermally activated CsI vapor, which reconstructs the surface that is rich in MA and CsI with reduced dangling bonds. Simultaneously, an array of Cs‐Pb‐rich nanoislands is constructed on the surface of the MAPbI3 single crystals. This newly reconstructed nanoisland surface enhances the light absorbance over 50% and increases the charge carrier mobility from 56 to 93 cm2 V−1 s−1. As confirmed by Kelvin probe force microscopy, the nanoislands form a gradient band bending that prevents recombination of excess carriers, and thus, enhances lateral carrier transport properties. This unique engineering of the single crystal surface provides a pathway towards developing high‐quality perovskite single‐crystal surface for optoelectronic applications.
- Subjects
SINGLE crystals; CRYSTAL surfaces; KELVIN probe force microscopy; CHARGE carrier mobility; PEROVSKITE; OPTOELECTRONIC devices
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 50, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202105542