Journal
NANO ENERGY
Volume 92, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106694
Keywords
Photodetectors; ZnO; P3HT; Self-powered; Piezo-phototronic; Fiber-shaped; Promoted carrier separation
Categories
Funding
- National Natural Science Foundation of China [51973099, 32101451, 21761029]
- Taishan Scholar Program of Shandong Province [tsqn201812055, tspd20181208]
- State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao Uni-versity) [ZKT04, ZDKT202005, GZRC202007]
- First Division Alar Science and Technology Plan Project in Xinjiang Corps [2019GJJ04]
- Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of Xinjiang Production and Construction Corps [CRUZD2003]
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This study demonstrates fiber-shaped photodetectors constructed by vertical organic-inorganic heterostructures, achieving self-powered behavior and promoted photoresponse through piezo-phototronic effect. By controlling bend-induced piezo-potentials, tunable photoresponse and ultrafast response and recovery were realized, enhancing light detection ability.
Sustainable and flexible photodetectors that simultaneously achieve sufficient responsivity and ultrafast speed is urgently needed to meet the booming of big data and portable electronics in our daily life. Herein, we demonstrate fiber-shaped photodetectors constructed by vertical organic-inorganic heterostructures, which achieves self-powered behavior and promoted photoresponse under series of coaxial p-n junctions and piezophototronic mechanism. Tunable photoresponse and ultrafast response and recovery (< 40 ms) are realized at zero bias by controlling bend-induced piezo-potentials of the photodetector. For the bended device with 1.96% strain, the photoresponse is enhanced 81.2% by the piezo-phototronic effect compared to the device under no strain. FEM simulation indicates that the non-uniform strain and piezo-potential distribution on the bended fiber device promotes carrier separation in the coaxial interfaces of p-n junctions, and thus improving the light detection ability. The present work provides a promising strategy for improving fiber-shaped photodetectors as well as a new idea for self-powered and ultrafast light detection in portable and wearable applications.
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