Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/137245
Title: Surface molecular doping of all-inorganic perovskite using zethrenes molecules
Authors: Arramel
Pan, Hu
Xie, Aozhen
Hou, Songyan
Yin, Xinmao
Tang, Chi Sin
Hoa, Nguyen T.
Muhammad D. Birowosuto
Wang, Hong
Dang, Cuong
Rusydi, Andrivo
Wee Andrew T. S.
Wu, Jishan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Arramel, Pan, H., Xie, A., Hou, S., Yin, X., Tang, C. S., . . . Wu, J. (2019). Surface molecular doping of all-inorganic perovskite using zethrenes molecules. Nano Research, 12(1), 77–84. doi:10.1007/s12274-018-2183-9
Journal: Nano Research
Abstract: We present an optical and photoelectron spectroscopic study to elucidate the interfacial electronic properties of organic-inorganic semiconductor heterojunctions formed in a kinetically blocked heptazethrene triisopropylsilyl ethynylene (HZ-TIPS) and its homologue, octazethrene (OZ-TIPS) on an all-inorganic perovskite cesium lead bromide (CsPbBr3) surface. The photoluminescence behavior of the underlying perovskites upon differing molecular doping conditions was examined. It turns out that the charge transfer dynamics of thermally-evaporated OZ-TIPS molecule exhibited a faster average lifetime than that of the HZ-TIPS case suggesting the importance of the biradical state in the former molecule. An interfacial dipole was formed at the interface due to the competing interaction between the dispersion force of the bulky TIPS-substituent group and the attractive van der Waals interaction at the first few layers. Photoemission spectroscopy of the physisorbed HZ-TIPS shows chemical shifts, which indicates electron transfer from HZ-TIPS molecules to the CsPbBr3 perovskite single crystal. In contrast, the adsorbed OZ-TIPS molecular layer on CsPbBr3 demonstrates the opposite trend indicating a hole transfer process. The average molecular orientation as determined by near edge X-ray absorption fine structure (NEXAFS) suggests that the HZ-TIPS molecular plane is generally lifted with respect to the perovskite surface. We suggest that the nature of the closed-shell electronic ground state of HZ-TIPS could contribute to the formation of interfacial dipole at the molecule/perovskite interface.
URI: https://hdl.handle.net/10356/137245
ISSN: 1998-0124
DOI: 10.1007/s12274-018-2183-9
Rights: © 2018 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. This paper was published in Nano Research and is made available with permission of Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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