Bipolar photoresponse photodetectors enable spectral discrimination and optical logic, but conventional devices often suffer from poor stability and complex fabrication. Here, we report a fully solid-state, chip-scale BaTiO3/ZnO heterojunction photodetector with a simple structure, compact size, and precise wavelength discrimination. Under self-powered operation, it selectively detects 330 nm and 395 nm light with positive and negative photocurrents, showing responsivities of 6.7 and -26.1 mA/W, respectively. Fast response and narrow wavelength selectivity (∼67 nm) are achieved via optimized pyroelectric current regulation. The interplay between the photovoltaic effect in the heterojunction and the polarization of the BaTiO3 is investigated. Finally, a 5 × 5 BaTiO3/ZnO array was further demonstrated for encrypted imaging. This work presents a compact, high-performance platform for precise light-wavelength discrimination, optical logic, and secure optical communication.
Ultraviolet (UV) photodetectors (PDs) have been extensively investigated; however, achieving high-performance photodetection in the vacuum-ultraviolet (VUV) spectral region remains relatively challenging. In this work, a p-hBN/n-ZnO heterojunction UVA-VUV broadband UV PD was fabricated with wavelength-dependent trap-as...
Self-powered detectors with bipolar photoresponse have significant potential applications across various fields. However, achieving both fast response and high-sensitivity simultaneously in a single bipolar photodetector remains a challenge. In this study, we present a self-powered photodetector based on a MoS2/SnBi2Te...
Yu-Run Qu, Cheng-Yu Leng, Wei Zhou et al.· ACS Applied Materials and In...· 0 citations
Organic−inorganic heterojunctions have emerged as a promising platform for high-performance photodetectors, yet most existing works integrate organic crystalline or amorphous thin films with 2D inorganic semiconductors, which are fundamentally limited by high defect densities, short exciton diffusion lengths, and the...
Qiu-Qin Ye, Shu-Wen Shen, Chenxu Sheng et al.· ACS Applied Nano Materials· 0 citations
The convergence of ultraviolet (UV) communication and neuromorphic computing demands multifunctional devices that integrate high-speed photodetection with synaptic learning, yet the intrinsic mismatch between fast photoresponse and slow memory retention poses a fundamental challenge for monolithic integration. Here, we...
Jie Huang, Wen-Dong Lu, C. Lu et al.· ACS Applied Materials and In...· 0 citations
Organic photodetectors (OPDs) are emerging as versatile alternatives to traditional inorganic photodetectors, offering tunable optical properties, flexible architectures, and cost-effective, solution-processable fabrication. While single-band OPDs have been developed for specific spectral ranges, high-performance multi...
