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Crystal Size Effect on Carrier Transport of Microscale Perovskite Junctions via Soft Contact

Cited 19 time in Web of Science Cited 19 time in Scopus
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
2020-12
Publisher
American Chemical Society
Citation
Nano Letters, Vol.20 No.12, pp.8640-8646
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.
ISSN
1530-6984
URI
https://hdl.handle.net/10371/202529
DOI
https://doi.org/10.1021/acs.nanolett.0c03347
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  • College of Engineering
  • Department of Materials Science & Engineering
Research Area Molecular doping in emerging semiconductors, Next-generation electronic devices, Transport phenomena in organic semiconductors

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