Heterostructured WS2/CH3NH3PbI3Photoconductors with Suppressed Dark Current and Enhanced Photodetectivity

Chun Ma, Yumeng Shi, Weijin Hu, Ming-Hui Chiu, Zhixiong Liu, Ashok Bera, Feng Li, Hong Wang, Lain-Jong Li, Tao Wu

Research output: Contribution to journalArticlepeer-review

281 Scopus citations

Abstract

High-performance planar photoconductors based on hybrid perovskite CH3NH3 PbI3 and 2D material WS2 were fabricated and characterized for the first time. Due to the superior properties of both perovskite and WS2, these photodetectors with a simple bilayer structure exhibited high on/off ratios and high responsivity. Owing to the high mobility of the WS2 monolayer and the efficient inter facial charges separation, the response speed of the hybrid WS2/perovskite photoconductor was enhanced by four orders of magnitude compared to the reference perovskite single layer. Furthermore, the WS2 monolayer served as an atomically flat substrate, and the perovskite films grown on top showed better crystallinity, which may facilitate the synthesis of other perovskite-based devices. Overall, our results demonstrated a prototypical optoelectronic device built on TMD/perovskite hetero structures, paving their way for future applications.
Original languageEnglish (US)
Pages (from-to)3683-3689
Number of pages7
JournalAdvanced Materials
Volume28
Issue number19
DOIs
StatePublished - Mar 23 2016

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