Crystal Size Effect on Carrier Transport of Microscale Perovskite Junctions via Soft Contact
- Authors
- Zhao, Zhibin; Wang, Wenduo; Zhou, Xin; Ni, Lifa; Kang, Keehoon; Lee, Takhee; Han, Hong; Yuan, Hongrui; Guo, Chenyang; Wang, Maoning; Ko, Min Jae; Li, Yuelong; Xiang, Dong
- Issue Date
- Dec-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- perovskite single crystals; switches and rectifier; liquid metal electrode; negative differential resistance; size effect
- Citation
- NANO LETTERS, v.20, no.12, pp.8640 - 8646
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 20
- Number
- 12
- Start Page
- 8640
- End Page
- 8646
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32725
- DOI
- 10.1021/acs.nanolett.0c03347
- ISSN
- 1530-6984
- Abstract
- To reduce the size of optoelectronic devices, it is essential to understand the crystal size effect on the carrier transport through microscale materials. Here, we show a soft contact method to probe the properties of irregularly shaped microscale perovskite crystals by employing a movable liquid metal electrode to form a self-adaptative deformable electrode-perovskite-electrode junction. Accordingly, we demonstrate that (1) the photocurrents of perovskite quantum dot films and microplatelets show profound differences regarding both the on/off ratio and the response time upon light illumination; and (2) small-size perovskite (<50 mu m) junctions may show negative differential resistance (NDR) behavior, whereas the NDR phenomenon is absent in large-size perovskite junctions within the same bias regime. Our studies provide a method for studying arbitrary-shaped crystals without mechanical damage, assisting the understanding of the photogenerated carriers transport through microscale crystals.
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