Peng Xiaoli, Wang Weihao, Zeng Yiyu, Pan Xinhua, Ye Zhizhen, Zeng Yujia
State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University Hangzhou 310027 People's Republic of China
Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University Shenzhen 518060 People's Republic of China.
RSC Adv. 2018 Sep 26;8(58):33174-33179. doi: 10.1039/c8ra05909h. eCollection 2018 Sep 24.
A flexible self-powered ultraviolet (UV) photodetector based on ZnO nanorods (NRs) and a novel iodine-free quasi solid-state electrolyte was fabricated. The obtained device has a fast and high response to UV light illumination at zero bias and also shows long-term stability. The responsivity is 50.5 mA W and the response time is less than 0.2 s. Strain-induced piezo-phototronic potential within wurtzite-structured ZnO can optimize the performance of corresponding optoelectronic devices since it could effectively tune the charge carriers' separation and transport. The photoresponse performances of the photodetector under different upward angles (tensile strain) and downward angles (compressive strain) at 0 V bias were studied in detail. A 163% change of responsivity was obtained when the downward angle reached 60°. The enhancement could be interpreted by the piezo-phototronic effect. The piezoelectric potential (piezopotential) at the ZnO NRs/electrolyte interface can expand the built-in field, and as a result, it is easier for charge carriers to separate and transport.
基于氧化锌纳米棒（NRs）和新型无碘准固态电解质制备了一种柔性自供电紫外（UV）光电探测器。所制备的器件在零偏压下对紫外光照射具有快速且高的响应，并且还表现出长期稳定性。响应度为50.5 mA/W，响应时间小于0.2 s。纤锌矿结构的氧化锌内的应变诱导压光电子势可以优化相应光电器件的性能，因为它可以有效地调节电荷载流子的分离和传输。详细研究了该光电探测器在0 V偏压下不同向上角度（拉伸应变）和向下角度（压缩应变）时的光响应性能。当向下角度达到60°时，响应度变化了163%。这种增强可以用光压电效应来解释。氧化锌纳米棒/电解质界面处的压电势可以扩展内建电场，结果，电荷载流子更容易分离和传输。
