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Issue 15, 2018
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High-performing ultrafast transparent photodetector governed by the pyro–phototronic effect

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Abstract

In this work we utilized the advantage of the photo-induced pyroelectric effect – known as “Pyro–phototronic” – to design a self-powered, ultrafast, transparent ultraviolet (UV, 365 nm) photodetector. The device architecture contains an UV absorbing pyroelectric ZnO layer sandwiched between hole-selective V2O5 and a bottom ITO electrode. In addition, the device shows a high optical transmittance, >70%, in the entire visible region. The photo current of the device was enhanced from 19 to 42 μA under pulsed UV light illumination (λ = 365 nm, 4 mW cm−2) by exploiting the pyro–phototronic potential. In addition, the photodetector demonstrated ultrafast responses of ∼4 μs for the rise time and ∼16 μs for the fall time. Further, a high photoresponsivity of ∼36.34 mA W−1 and excellent photodetectivity of ∼6.04 × 1014 Jones, with an enhancement of 725% in both due to the pyroelectric potential, were measured. This novel approach will open a new path to design transparent and ultrafast devices, as well as on the flexible substrates, for future optoelectronic applications.

Graphical abstract: High-performing ultrafast transparent photodetector governed by the pyro–phototronic effect

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Publication details

The article was received on 29 Dec 2017, accepted on 15 Mar 2018 and first published on 17 Mar 2018


Article type: Paper
DOI: 10.1039/C7NR09699B
Citation: Nanoscale, 2018,10, 6928-6935
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    High-performing ultrafast transparent photodetector governed by the pyro–phototronic effect

    M. Kumar, M. Patel, T. T. Nguyen, J. Kim and J. Yi, Nanoscale, 2018, 10, 6928
    DOI: 10.1039/C7NR09699B

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