Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Abstract

Fibrous 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.

A Universal Assembly Strategy of All‐Inorganic Non‐Layered Perovskite Single Crystals for High‐Responsivity Photodetectors

“…In particular, the 1D CPI nanobelts and 2D CSI nanosheets exhibit ultrathin thicknesses of 40 and 150 nm, respectively. The achieved preparation of AIPSCs has great significance in developing nanoscale optoelectronic applications, [33][34][35] which remains intriguing to be investigated. The growth results of these representative AIPSCs provide reliable evidence for the great universality of our strategy.…”

Recent Advances in Materials, Structures, and Applications of Flexible Photodetectors

“…have extended and integrated a woven optoelectronic keyboard consisting of 40 PD button cells by four individual FPDs, achieving a degree of integration extension by 1000%. [ 111 ] Each FPD is based on a unified type II TiO 2 /Cs 3 Cu 2 I 5 heterojunction, exhibiting a significant dark current reduction of 8 orders of magnitude. Moreover, the photocurrent remains highly stable after bending and twisting states.…”

Experimental comparison between Nb2O5- and TiO2-based photoconductive and photogating GFET UV detector

“…In 2021, a MAPbI 3 nanowire photodetector was fabricated, and a responsivity of 20.56 A/W at 1 V was reported 33 . In 2023, a type-II heterojunction of TiO 2 NTs/Cs 3 Cu 2 I 5 nanoparticles hybrid fiber was presented with a responsivity of 26.9 mA/W at − 1 V 34 . The photogating effect can be investigated in three different structures, namely quantum dot 10 , bulk 23 – 25 , and thin film structures 8 .…”