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Related Experiment Video

Updated: Oct 25, 2025

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials

Published on: January 5, 2019

Actively variable-spectrum optoelectronics with black phosphorus.

Hyungjin Kim^1,2, Shiekh Zia Uddin^1,2, Der-Hsien Lien^1,2

¹Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA.

|August 12, 2021

Summary

This summary is machine-generated.

Black phosphorus enables tunable infrared optoelectronics at room temperature. This strain-sensitive material allows reversible wavelength adjustments in devices, advancing applications like gas sensing.

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Area of Science:

Materials Science
Optoelectronics
Infrared Technology

Background:

Room-temperature infrared optoelectronic devices are crucial for various applications.
Current methods for tuning operating wavelengths involve complex fabrication and fixed spectral ranges.
A platform for actively tunable optoelectronics after fabrication is highly desirable.

Purpose of the Study:

To demonstrate a novel platform for high-performance, room-temperature infrared optoelectronics with actively variable spectra.
To explore the potential of black phosphorus for tunable optoelectronic devices.
To showcase multiplexed gas sensing capabilities using this tunable platform.

Main Methods:

Utilizing the strain-sensitive bandgap of black phosphorus (0.22–0.53 eV) for spectral tuning.
Fabricating and testing black phosphorus-based light-emitting diodes and photodetectors.
Developing a multiplexed nondispersive infrared gas sensing system.

Main Results:

Achieved continuous and reversible tuning of operating wavelengths in black phosphorus optoelectronics.
Demonstrated high-performance room-temperature operation.
Successfully implemented multiplexed sensing of multiple gases (CO2, CH4, H2O) with a single light source.

Conclusions:

Black phosphorus offers an ideal material platform for actively tunable infrared optoelectronics.
This technology bridges a gap by enabling variable emission and detection spectra post-fabrication.
The developed platform holds significant potential for diverse optoelectronic applications, including advanced gas sensing.