biostudies-literatureZhang ZHScience and Technology Planning Project of Guangdong ProvinceFundo para o Desenvolvimento das Ci?ncias e da TecnologiaUniversidade de Macau10398-10406https://www.ebi.ac.uk/biostudies/studies/S-EPMC10910456biostudies-literatureUnknown16(8)The rapid evolution of the Internet of Things has engendered increased requirements for low-cost, self-powered UV photodetectors. Herein, high-performance self-driven UV photodetectors are fabricated by designing asymmetric metal-semiconductor-metal structures on the high-quality large-area CsCu₂I₃ microwire arrays. The asymmetrical depletion region doubles the photocurrent and response speed compared to the symmetric structure device, leading to a high responsivity of 233 mA/W to 355 nm radiation. Notably, at 0 V bias, the asymmetric device produces an open-circuit voltage of 356 mV and drives to a short-circuit current of 372 pA; meanwhile, the switch ratio (<i>I</i>_ph/<i>I</i>_dark) reaches up to 10³, indicating its excellent potential for detecting weak light. Furthermore, the device maintains stable responses throughout 10000 UV-light switch cycles, with negligible degradation even after 90-day storage in air. Our work establishes that CsCu₂I₃ is a good candidate for self-powered UV detection and thoroughly demonstrates its potential as a passive device.ACS applied materials & interfacesAir-Stable Self-Driven UV Photodetectors on Controllable Lead-Free CsCu₂I₃ Microwire Arrays.PMC10910456MYRG2020-00207-IAPME0107/2023/AFJ0071/2019/AMJ0052/2021/AGJ0027/2023/AMJ2022A0505050067MYRG2020-00082-IAPMEMYRG-GRG2023-00230-IAPME-UMDFFu AYan SSZhang ZHKong YCSu SCNg KWWang SPLi LChen YLWei ZPLiu HCLian ZDfalseAir-Stable Self-Driven UV Photodetectors on Controllable Lead-Free CsCu₂I₃ Microwire Arrays.The rapid evolution of the Internet of Things has engendered increased requirements for low-cost, self-powered UV photodetectors. Herein, high-performance self-driven UV photodetectors are fabricated by designing asymmetric metal-semiconductor-metal structures on the high-quality large-area CsCu₂I₃ microwire arrays. The asymmetrical depletion region doubles the photocurrent and response speed compared to the symmetric structure device, leading to a high responsivity of 233 mA/W to 355 nm radiation. Notably, at 0 V bias, the asymmetric device produces an open-circuit voltage of 356 mV and drives to a short-circuit current of 372 pA; meanwhile, the switch ratio (<i>I</i>_ph/<i>I</i>_dark) reaches up to 10³, indicating its excellent potential for detecting weak light. Furthermore, the device maintains stable responses throughout 10000 UV-light switch cycles, with negligible degradation even after 90-day storage in air. Our work establishes that CsCu₂I₃ is a good candidate for self-powered UV detection and thoroughly demonstrates its potential as a passive device.2024-01-01T00:00:00Z2024 Feb2025-04-05T11:38:51.389Z2025-04-05T11:38:51.389ZS-EPMC109104563838097810.1021/acsami.3c17881