Schottky junctions on perovskite single crystals: light-modulated dielectric constant and self-biased photodetection

Parvez Abdul Ajij Shaikh, Dong Shi, Jose Ramon Duran Retamal, Arif D. Sheikh, Mohammed Haque, Chen-Fang Kang, Jr-Hau He, Osman Bakr, Tao Wu

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Schottky junctions formed between semiconductors and metal contacts are ubiquitous in modern electronic and optoelectronic devices. Here we report on the physical properties of Schottky-junctions formed on hybrid perovskite CH3NH3PbBr3 single crystals. It is found that light illumination can significantly increase the dielectric constant of perovskite junctions by 2300%. Furthermore, such Pt/perovskite junctions are used to fabricate self-biased photodetectors. A photodetectivity of 1.4 × 1010 Jones is obtained at zero bias, which increases to 7.1 × 1011 Jones at a bias of +3 V, and the photodetectivity remains almost constant in a wide range of light intensity. These devices also exhibit fast responses with a rising time of 70 μs and a falling time of 150 μs. As a result of the high crystal quality and low defect density, such single-crystal photodetectors show stable performance after storage in air for over 45 days. Our results suggest that hybrid perovskite single crystals provide a new platform to develop promising optoelectronic applications. © 2016 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)8304-8312
Number of pages9
JournalJ. Mater. Chem. C
Volume4
Issue number35
DOIs
StatePublished - 2016

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