High-Performance, Self-Powered Photodetectors Based on Perovskite and Graphene

Juan Li, Shihao Yuan, Guanqi Tang, Guijun Li, Dan Liu, Jing Li, Xihong Hu, Yucheng Liu, Jianbo Li, Zhou Yang, Shengzhong Frank Liu, Zhike Liu, Fei Gao, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

Abstract

An ideal photodetector must exhibit a fast and wide tunable spectral response, be highly responsive, have low power consumption, and have a facile fabrication process. In this work, a self-powered photodetector with a graphene electrode and a perovskite photoactive layer is assembled for the first time. The graphene electrode is prepared using a solution transfer process, and the perovskite layer is prepared using a solution coating process, which makes the device low cost. Graphene can form a Schottky junction with TiO2to efficiently separate/transport photogenerated excitons at the graphene/perovskite interface. Unlike the conventional photovoltaic structure, in this photodetector, both photogenerated electrons and holes are transported along the same direction to graphene, and electrons tunneled into TiO2are collected by the cathode and holes transported by graphene are collected by the anode; therefore, the photodetector is self-powered. The photodetector has a broad range of detection, from 260 to 900 nm, an ultrahigh on-off ratio of 4 × 106, rapid response to light on-off (<5 ms), and a high level of detection of ∼1011Jones. The high performance is primarily due to the unique charge-transport property of graphene and strong light absorption properties of perovskite. This work suggests a new method for the production of self-powered photodetectors with high performance and low power consumption on a large scale.
Original languageEnglish
Pages (from-to)42779-42787
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number49
DOIs
Publication statusPublished - 13 Dec 2017

Keywords

  • graphene
  • high performance
  • perovskite
  • photodetector
  • self-powered

ASJC Scopus subject areas

  • Materials Science(all)

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