2021Advanced Materials Interfaces

Ternary FePSe₃ Atomic Layers with Competitive Temperature Coefficient of Resistance for Uncooled Infrared Bolometers

Alei Li, Yanfeng Ge, Yuan Gan, Yulu L. Ren, Yingjie He, Qianxue Chen, Peipei Wang, Kai Zhang, Shengyuan A. Yang, Judy Z. Wu, Rui Chen, Liyuan Zhang, Youpin Gong

Advanced Materials Interfaces · 8, 2100491 (2021)

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DOI 10.1002/admi.202100491

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Introduction

FePSe₃ flakes are used as uncooled bolometers: absorbed infrared radiation warms the device, and the temperature-dependent resistance converts that heating into an electrical signal. The tests cover 980–1550 nm at room temperature.

A closer reading

Separate the thermometer from its thermal environment. A large resistance change per kelvin helps only if the absorbed power can actually raise the flake’s temperature; interlayer thermal isolation is therefore part of the detector design.