Day-Night imaging without Infrared Cutfilter removal based on metal-gradient perovskite single crystal photodetector
Yao Ma, Leting Shan, Yiran Ying, Liang Shen, Yufeng Fu, Linfeng Fei, Yusheng Lei, Nailin Yue, Wei Zhang, Hong Zhang, Haitao Huang, Kai Yao, Junhao Chu
Abstract
Day-Night imaging technology that obtains full-color and infrared images has great market demands for security monitoring and autonomous driving. The current mainstream solution relies on wide-spectrum silicon photodetectors combined with Infrared Cutfilter Removal, which increases complexity and failure rate. Here, we address these challenges by employing a perovskite photodetector based on Pb−Sn alloyed single crystal with a vertical bandgap-graded structure that presents variable-spectrum responses at different biases and extends the infrared detection range close to 1100 nm. Taking advantage of the Pb−Sn gradients in mobility and built-in field, the perovskite photodetector shows a large linear dynamic range of 177 dB. In addition, the optoelectronic characteristics feature long-term operational stability over a year. We further develop an imaging module prototype without Infrared Cutfilter Removal that exhibits excellent color fidelity with RGB color differences ranging from 0.48 to 2.46 under infrared interference and provides over 26-bit grayscale resolution in infrared imaging. Ma et al. report Pb-Sn alloyed perovskite with vertical gradient bandgap for bias-switchable photodetectors with response from visible to NIR region, enabling day-night imaging without Infrared Cutfilter Removal for color perception under infrared interference and 26 bit gray-level resolution.