FePSe₃ layers detect infrared radiation at room temperature
The detector used the temperature sensitivity of FePSe₃ resistance to read out heating by infrared light.
Alei Li and colleagues measured a room-temperature resistance coefficient of about −2.96% per kelvin in FePSe₃ layers. They used this response to make an uncooled bolometer and tested it at infrared wavelengths from 980 to 1550 nm.
The temperature change also depends on how quickly absorbed heat can escape. The authors attributed the response to both the resistance coefficient and the thermal isolation between inner layers and their surroundings. Liyuan Zhang was a coauthor of the collaboration.