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Reduced graphene oxide-induced crystallization of CuPc interfacial layer for high performance of perovskite photodetectors

Zou, T; Zhang, J; Huang, S; Liu, C; Qiu, R; Wang, X; Wu, W; ... Zhou, H; + view all (2019) Reduced graphene oxide-induced crystallization of CuPc interfacial layer for high performance of perovskite photodetectors. RSC Advances , 9 (7) pp. 3800-3808. 10.1039/c8ra08864k. Green open access

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Abstract

Perovskite-based photodetectors have great potential in light-signal conversion; the suppression of the dark current is regarded as one of the main concerns within the academic research communities to achieve a high-performance photodetector. Interfacial engineering in the transport layer is considered as one of the most essential methods for enhancement of perovskite photodetectors. Here, a nanocomposite thin film of tetra-sulfonated copper phthalocyanines and reduced graphene oxide (TSCuPc/rGO) was investigated as the interfacial layer in perovskite-based photodetectors. Photodetectors with the TS-CuPc/rGO thin film as the interfacial layer exhibited a low dark current density of 2.2 � 108 A cm2 at bias of 0.1 V as well as high responsivity and detectivity of �357 mA W1 and �4.2 � 1012 jones, respectively; moreover, we observed an ON/OFF ratio of 7.33 � 103 to 520 nm light with an intensity of �0.077 mW cm2 . Our study revealed that with rGO additives, TS-CuPc molecules were favorable for the formation of an edge-on stacking film with high crystallinity. The rGO-induced crystalline TS-CuPc thin film with lower crystallographic defects effectively reduced the carrier recombination rate at the interfaces, leading to a suppressed dark current and enhanced photocurrent in the photodetector device, when compared to the less crystalline TS-CuPc layer.

Type: Article
Title: Reduced graphene oxide-induced crystallization of CuPc interfacial layer for high performance of perovskite photodetectors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c8ra08864k
Publisher version: https://doi.org/10.1039/c8ra08864k
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10069186
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