Air-Stable Self-Powered Photodetectors Based on Lead-Free CsBi3I10/SnO2 Heterojunction for Weak Light Detection

Lead halide perovskites (LHPs) have been widely investigated in photodetection applications owing to their intriguing optoelectronic properties. However, the application of LHPs-based photodetectors (PDs) is hindered because of the toxicity of lead and instability in ambient air. Here, an air-stable self-powered photodetector is designed based on all-inorganic lead-free CsBi3I10/SnO2 heterojunction. The device exhibits broad spectral response in both UV and visible light, fast response on mu s scale, and decent long-term stability. The device holds a faster response speed (t(r)/t(d) = 7.8/8.8 mu s), among the best reported self-powered lead-free perovskites photodetectors. More importantly, the device can display obvious photoresponses even under ultra-weak light intensity as low as 10 pW cm(-2), showing better weak-light sensitivity than previously reported lead-free perovskites photodetectors, to the best of our knowledge. Moreover, the device holds good air stability in the 73 days test without encapsulation. These results suggest that CsBi3I10/SnO2-based self-powered PDs with high photodetection capability possess enormous potential in stable and broadband PDs for weak light detection in the future.

Automated summary

The self-powered photodetector based on CsBi3I10/SnO2 exhibits broad spectral response, fast response time, and good long-term stability. It demonstrates high photodetection capability, especially for weak light detection, making it a promising option for stable and broadband photodetectors in the future.