Journal
SMALL
Volume 15, Issue 25, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201901004
Keywords
black phosphorus; fast response; perovskites; phototransistors; ultrahigh sensitivity
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Funding
- Research Grants Council (RGC) of Hong Kong, China [PolyU 152087/17E]
- Hong Kong Polytechnic University [1-YW0Y]
- NSFC [61704051]
- Hunan Province Natural Science Foundation [2017JJ3033]
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Phototransistors are recognized as highly sensitive photodetectors owing to their high gain induced by a photogating effect. However, the response speed of a typical phototransistor is rather slow due to the long lifetime of trapped carriers in the channel. Here, a novel Schottky barrier-controlled phototransistor that shows ultrahigh sensitivity as well as a fast response speed is reported. The device is based on a channel of few-layer black phosphorous modified with a MAPbI(3-x)Cl(x) perovskite layer, whose channel current is limited by the Schottky barrier at the source electrode. The photoresponse speed of the device can be tuned by changing the drain voltage, which is attributed to a field-assisted detrapping process of electrons in the perovskite layer close to the Schottky barrier. Under optimal conditions, the device exhibits a high responsivity of 10(6)-10(8) A W-1, an ultrahigh specific detectivity up to 9 x 10(13) Jones, and a response time of approximate to 10 ms.
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