Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Author:

Deng Xiaolei12,Li Ziqing3ORCID,Cao Fa12,Hong Enliu1,Fang Xiaosheng13ORCID

Affiliation:

1. Department of Materials Science State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. China

2. Zhangjiang Fudan International Innovation Center Shanghai 201210 P. R. China

3. Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of Optoelectronics Fudan University Shanghai 200433 P. R. China

Abstract

AbstractFibrous photodetectors (FPDs) have attracted great interest in wearable and consumer electronics, which is a lightweight and flexible tools to achieve efficient light information transmission. However, there is a necessary compromise between high optoelectronic performance and high‐level integration. Herein, a woven optoelectronic keyboard consisting of 40 PD button units is extended and integrated from four individual FPDs, with the integration level expanding by 1000%. Each FPD is based on uniform type‐II TiO2/Cs3Cu2I5 heterojunction, which exhibits greatly reduced dark current by eight orders of magnitudes, large rectification ratio up to 33306@± 5V, high on–off ratio of 2.8 × 104@−1 V and self‐powered responsivity of 26.9 mA W−1. The vacuum‐deposited Cs3Cu2I5 nanoparticles finely passivate the massive defects and serve as a p‐type hole transport layer to improve hole transfer efficiency, which greatly promotes the radial transport and collection of photogenerated electrons. Moreover, the photocurrent remains highly stable after bending and twisting states. Intriguingly, the woven optoelectronic keyboards successfully realize logic AND/OR, further identifying the UV light signal as a keying text signal (“A–Z” letters, “0–9” numbers, and four punctuations). This work not only provides a scalable strategy to reduce device redundancy but also shows the great potential of fibrous photodetectors for wearable optical communication.

Funder

National Natural Science Foundation of China

Science and Technology Commission of Shanghai Municipality

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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