@article{Li2026, 
author = {Jiaxu Li and Wenping Cao and Yunbiao Dong and Mingrui Zhou and Xingchi Liu and Jiahao Yao and Tao Xu and Litao Sun},
title = {Synergistic photovoltaic-pyroelectric coupling in a Ga2O3/BaTiO3 heterojunction for highly sensitive solar-blind ultraviolet photodetection},
year = {2026},
journal = {Nano Research},
keywords = {Ga2O3/BaTiO3 heterojunction, solar-blind ultraviolet photodetector, pyro-phototronic effect, self-powered photodetection, secure optical communication},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94909046},
doi = {10.26599/NR.2026.94909046},
abstract = {Ga2O3-based solar-blind ultraviolet photodetectors are promising for low-background UV sensing but remain limited by the trade-off between sensitivity and effective transient photoresponse. Here, a Ga2O3/BaTiO3 (BTO) heterojunction photodetector is developed to enable highly sensitive, self-powered detection of transient optical events through the synergistic coupling of photovoltaic and pyroelectric effects. Owing to the type-II band alignment and the spontaneous polarization of BTO, the device delivers an ultralow dark current on the order of 10-13 A, a photo-to-dark current ratio exceeding 106, and a specific detectivity of 2.63 × 1013 Jones. Under zero-bias and low-bias conditions, light-induced pyroelectric polarization modulation generates giant bipolar transient current pulses, contributing significantly to the self-powered photoresponse. Furthermore, the pyroelectric field also dynamically enhances interfacial carrier separation, thereby amplifying the overall photoresponse. This work offers a promising route toward intelligent solar-blind optoelectronic systems integrating event-driven sensing, self-powered operation, and hardware-level information security.}
}