On the Impact of Cadmium Sulfide Layer Thickness on Kesterite Photodetector Performance

Kesterites are currently viewed as one of the most promising candidates for earth abundant and benign elements to substitute critical raw materials in photovoltaic technologies may also be suitable low-noise, room-temperature, self-powered photodetectors. However, while impact buffer layers on kesterite solar cell efficiency has been an active area investigation, links between photodetector performance intermediate yet addressed. Herein, cadmium sulfide (Cu2ZnSnS4) photodetectors is probed. Specifically, effect layer thickness various metrices clarified, including noise current, spectral responsivity, equivalent power, frequency response, specific detectivity. Devices with a 100 nm perform best, achieving linear dynamic range 180 dB responses tens kHz. The key loss mechanisms identified, it found that primarily limited by shunt resistance-induced thermal defect-induced nonradiative losses. Furthermore, we estimate upper radiative limit detectivity approximately 10 19 Jones. Our results highlight potential kesterites used interesting candidate photodetection applications.