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Highly narrowband perovskite single-crystal photodetectors enabled by surface-charge recombination

Highly narrowband perovskite single-crystal photodetectors enabled by surface-charge recombination Organolead trihalide perovskite is an emerging low-cost, solution-processable material with a tunable bandgap from the violet to near-infrared, which has attracted a great deal of interest for applications in high-performance optoelectronic devices. Here, we present hybrid perovskite single-crystal photodetectors that have a very narrow spectral response with a full-width at half-maximum of <20 nm. The response spectra are continuously tuned from blue to red by changing the halide composition and thus the bandgap of the single crystals synthesized by solution processes. The narrowband photodetection can be explained by the strong surface-charge recombination of the excess carriers close to the crystal surfaces generated by short-wavelength light. The excess carriers generated by below-bandgap excitation locate away from the surfaces and can be much more efficiently collected by the electrodes, assisted by the applied electric field. This provides a new design paradigm for a narrowband photodetector with broad applications where background noise emission needs to be suppressed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Photonics Springer Journals

Highly narrowband perovskite single-crystal photodetectors enabled by surface-charge recombination

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References (49)

Publisher
Springer Journals
Copyright
Copyright © 2015 by Nature Publishing Group
Subject
Physics; Physics, general; Applied and Technical Physics; Quantum Physics
ISSN
1749-4885
eISSN
1749-4893
DOI
10.1038/nphoton.2015.156
Publisher site
See Article on Publisher Site

Abstract

Organolead trihalide perovskite is an emerging low-cost, solution-processable material with a tunable bandgap from the violet to near-infrared, which has attracted a great deal of interest for applications in high-performance optoelectronic devices. Here, we present hybrid perovskite single-crystal photodetectors that have a very narrow spectral response with a full-width at half-maximum of <20 nm. The response spectra are continuously tuned from blue to red by changing the halide composition and thus the bandgap of the single crystals synthesized by solution processes. The narrowband photodetection can be explained by the strong surface-charge recombination of the excess carriers close to the crystal surfaces generated by short-wavelength light. The excess carriers generated by below-bandgap excitation locate away from the surfaces and can be much more efficiently collected by the electrodes, assisted by the applied electric field. This provides a new design paradigm for a narrowband photodetector with broad applications where background noise emission needs to be suppressed.

Journal

Nature Photonics – Springer Journals

Published: Aug 31, 2015

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