Self-Powered Solar-Blind Photodetectors and Arrays Based on Honeycomb-Grid Transparent Conductive Electrodes

Solar-blind photodetectors (SBPDs) are widely used in fire alarms, environmental ultraviolet (UV) monitoring, and secure communications. However, their performance is limited by the lack of high-performance short-wavelength transparent conductive electrodes (TCEs). Ag metal grid is proposed as the TCE for deep UV electrical devices, and the effects of the structure, duty ratio, and thickness of the grid on the transmittance and conductivity of the TCE are investigated. A honeycomb-shaped TCE with high UV transmittance (>85%) and low sheet resistance ( $10.3~\Omega $ /□) was achieved. Based on the honeycomb Ag grid TCEs, Ga2O3/Si self-powered SBPDs were developed, leading to a significant improvement in the devices’ photoresponse performance. In addition, detector arrays were fabricated, successfully enabling the imaging of SB signals. The short-wavelength TCEs with high transmittance and conductivity are expected to be applied to various UV optoelectronic devices, overcoming performance limitations and promoting the widespread use of UV optoelectronic devices in daily life.