Skin Safety Monitor Based on CsPbCl 3 /p-Si Heterojunction Optoelectronic Logic Gates

Excessive ultraviolet (UV) radiation and high humidity in the natural environment pose significant risks to human skin. Research indicates that the human skin surface becomes highly susceptible to various dermatological conditions when the UV index exceeds level 7. Similarly, humidity surpassing 70% can induce diseases such as eczema, dermatitis, and various allergic reactions. There is a compelling need for real-time monitoring of ambient UV levels and humidity intensity. In this work, high-performance optoelectronic logic gates (OELGs) based on a CsPbCl 3 /p-Si heterojunction were fabricated by a two-step spin-coating method. Based on different bias voltages and light intensity, the five logic functions (AND, OR, NOR, NOT and NAND) of the OELGs were implemented. Specifically, the OR gate was displayed for real-time environmental monitoring. Whatever the UV intensity exceeds level 7 or the ambient humidity surpasses 70%, the device outputs signal “1” to trigger the alarm, suggesting that individuals take timely protective measures. The findings illustrate the substantial potential of CsPbCl 3 /p-Si heterojunction OELGs for applications in skin safety monitor systems.