Journal
ADVANCED MATERIALS
Volume 30, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706986
Keywords
flexible materials; optical sensors; perovskites; photodetectors; self-powered detectors
Categories
Funding
- National Natural Science Foundation of China [51722204, 51422206, 51772197, 51372159, 51502184]
- National Key Basic Research Program of China [2014CB931702]
- 1000 Youth Talents Plan
- Key University Science Research Project of Jiangsu Province [17KJA430013]
- 333 High-level Talents Cultivation Project of Jiangsu Province
- Six Talents Peak Project of Jiangsu Province
- Natural Science Foundation of Jiangsu Province [BK20150331, BK20140009]
- Fundamental Research Funds for the Central Universities [ZYGX2016Z004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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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-TiO2-carbon fiber and CuO-Cu2O-Cu wire is designed and fabricated. The device shows an ultrahigh detectivity of 2.15 x 10(13) Jones under the illumination of 800 nm light at zero bias. CuO-Cu2O electron block bilayer extends response range of perovskite from 850 to 1050 nm and suppresses dark current down to 10(-11) 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.
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