Actively variable-spectrum optoelectronics with black phosphorus

Hyungjin Kim, Shiekh Zia Uddin, Lien Der-Hsien, Matthew Yeh, Nima Sefidmooye Azar, Sivacarendran Balendhran, Taehun Kim, Niharika Gupta, Yoonsoo Rho, Costas P. Grigoropoulos, Kenneth B. Crozier and Ali Javey ()
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Hyungjin Kim: University of California
Shiekh Zia Uddin: University of California
Lien Der-Hsien: University of California
Matthew Yeh: University of California
Nima Sefidmooye Azar: University of Melbourne
Sivacarendran Balendhran: University of Melbourne
Taehun Kim: University of California
Niharika Gupta: University of California
Yoonsoo Rho: University of California
Costas P. Grigoropoulos: University of California
Kenneth B. Crozier: University of Melbourne
Ali Javey: University of California

Nature, 2021, vol. 596, issue 7871, 232-237

Abstract: Abstract Room-temperature optoelectronic devices that operate at short-wavelength and mid-wavelength infrared ranges (one to eight micrometres) can be used for numerous applications1–5. To achieve the range of operating wavelengths needed for a given application, a combination of materials with different bandgaps (for example, superlattices or heterostructures)6,7 or variations in the composition of semiconductor alloys during growth8,9 are used. However, these materials are complex to fabricate, and the operating range is fixed after fabrication. Although wide-range, active and reversible tunability of the operating wavelengths in optoelectronic devices after fabrication is a highly desirable feature, no such platform has been yet developed. Here we demonstrate high-performance room-temperature infrared optoelectronics with actively variable spectra by presenting black phosphorus as an ideal candidate. Enabled by the highly strain-sensitive nature of its bandgap, which varies from 0.22 to 0.53 electronvolts, we show a continuous and reversible tuning of the operating wavelengths in light-emitting diodes and photodetectors composed of black phosphorus. Furthermore, we leverage this platform to demonstrate multiplexed nondispersive infrared gas sensing, whereby multiple gases (for example, carbon dioxide, methane and water vapour) are detected using a single light source. With its active spectral tunability while also retaining high performance, our work bridges a technological gap, presenting a potential way of meeting different requirements for emission and detection spectra in optoelectronic applications.

Date: 2021
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DOI: 10.1038/s41586-021-03701-1

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