Metal contact and carrier transport in single crystalline CH3NH3PbBr3 perovskite

Lin, Chun-Ho, Li, Ting-You, Cheng, Bin, Liu, Changxu, Yang, Chih-Wen, Ke, Jr-Jian, Wei, Tzu-Chiao, Li, Lain-Jong, Fratalocchi, Andrea and He, Jr-Hau (2018) Metal contact and carrier transport in single crystalline CH3NH3PbBr3 perovskite. Nano Energy, 53. pp. 817-827. ISSN 2211-2855

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Organic-inorganic perovskites have arrived at the forefront of solar technology due to their impressive carrier lifetimes and superior optoelectronic properties. By having the cm-sized perovskite single crystal and employing device patterning techniques, and the transfer length method (TLM), we are able to get the insight into the metal contact and carrier transport behaviors, which is necessary for maximizing device performance and efficiency. In addition to the metal work function, we found that the image force and interface charge pinning effects also affect the metal contact, and the studied single crystal CH3NH3PbBr3 features Schottky barriers of 0.17 eV, 0.38 eV, and 0.47 eV for Au, Pt, and Ti electrodes, respectively. Furthermore, the surface charges lead to the thermally activated transport from 207 K to 300 K near the perovskite surface. In contrast, from 120 K to 207 K, the material exhibited three-dimensional (3D) variable range hopping (VRH) carrier transport behavior. Understanding these fundamental contact and transport properties of perovskite will enable future electronic and optoelectronic applications.

Item Type: Article
Additional Information: This work was financially supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) (OSR-2016-CRG5-3005), KAUST solar center (FCC/1/3079-08-01), and KAUST baseline funding.
Uncontrolled Keywords: Carrier transport, Schottky barrier, Metal contact, CH3NH3PbBr3, Perovskite
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 13 Sep 2021 15:33
Last Modified: 13 Sep 2021 15:45

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