State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.
College of Physics, Optoelectronics and Energy, Center for Energy Conversion Materials & Physics (CECMP), Soochow University, Suzhou, 215006, P. R. China.
Adv Mater. 2018 May;30(21):e1706986. doi: 10.1002/adma.201706986. Epub 2018 Apr 11.
Self-powered flexible photodetectors without an external power source can meet the demands of next-generation portable and wearable nanodevices; however, the performance is far from satisfactory becuase of the limited match of flexible substrates and light-sensitive materials with proper energy levels. Herein, a novel self-powered flexible fiber-shaped photodetector based on double-twisted perovskite-TiO -carbon fiber and CuO-Cu O-Cu wire is designed and fabricated. The device shows an ultrahigh detectivity of 2.15 × 10 Jones under the illumination of 800 nm light at zero bias. CuO-Cu O electron block bilayer extends response range of perovskite from 850 to 1050 nm and suppresses dark current down to 10 A. The fast response speed of less than 200 ms is nearly invariable after dozens of cycles of bending at the extremely 90 bending angle, demonstrating excellent flexibility and bending stability. These parameters are comparable and even better than reported flexible and even rigid photodetectors. The present results suggest a promising strategy to design photodetectors with integrated function of self-power, flexibility, and broadband response.
自供电的柔性光电探测器无需外部电源，可满足下一代便携式和可穿戴纳米器件的需求；然而，由于柔性衬底和光敏材料与适当能级的有限匹配，其性能远不能令人满意。在此，设计并制造了一种基于双扭钙钛矿-TiO2-碳纤维和 CuO-Cu2O-Cu 线的新型自供电柔性光纤状光电探测器。该器件在零偏压下 800nm 光照射下的探测率高达 2.15×1012Jones。CuO-Cu2O 电子阻挡双层将钙钛矿的响应范围扩展至 850nm-1050nm，并将暗电流抑制至 10-10A。在极其 90°的弯曲角度下弯曲几十次后，其快速响应速度（小于 200ms）几乎不变，表现出优异的柔韧性和弯曲稳定性。这些参数与已报道的柔性甚至刚性光电探测器相当，甚至更好。本研究结果为设计具有自供电、柔韧性和宽带响应综合功能的光电探测器提供了一种有前途的策略。
