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Self-Biased High-Responsivity Photodetector Based on a Bi2SeTe2 Topological Insulator

Publication at Faculty of Mathematics and Physics, Central Library of Charles University |
2023

Abstract

Topological insulators show promise for high-performance optoelectronic applications due to their nonlinear optical properties, broad spectral absorption, ultrafast response to optical excitation, and excellent thermoelectric properties. Here, we introduce a self-biased photodetector based on the topological insulator Bi2SeTe2, driven by the photothermoelectric effect.

Operating without external bias, the photodetector delivers a competitive visible-range photoresponse reaching responsivity of approximate to 27 mA/W and detectivity of approximate to 2 x 10(9) Jones at 458 nm. Comparable to individual topological insulators as well as topological insulator-based heterojunctions, this underscores Bi2SeTe2's potential, especially in scenarios where external power sources cannot be used.

Its self-biased nature eliminates the need for an external bias, making it an ideal material for low-power and remote-sensing applications.