Ultrasensitive, flexible perovskite nanowire photodetectors with long‐term stability exceeding 5000 h. Issue 9 (4th May 2022)

• Record Type: Journal Article
• Authors: Wu, Dingjun; Xu, Yongchang; Zhou, Hai; Feng, Xin; Zhang, Jianqiang; Pan, Xiyan; Gao, Zheng; Wang, Rui; Ma, Guokun; Tao, Li; Wang, Hanbin; Duan, Jinxia; Wan, Houzhao; Zhang, Jun; Shen, Liangping; Wang, Hao; Zhai, Tianyou
• Is Part Of: InfoMat. Volume 4:Issue 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-04
• Subjects: diffuse reflection imaging -- flexible -- ionic liquids -- long‐term stability -- perovskite nanowire photodetectors; Materials -- Periodicals; Information technology -- Periodicals; Smart materials -- Periodicals; 620.11
• DOI: 10.1002/inf2.12320
• Languages: English
• ISSNs: 2567-3165

Abstract

Abstract: Photodetectors (PDs) based on perovskite nanowires are among the most promising next‐generation photodetection technologies; however, their poor long‐term stability is the biggest challenge limiting their commercial application. Herein, an ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF4 ), is incorporated as an additive into methylammonium lead triiodide (MAPbI3 ) nanowires; this not only effectively passivates defects to inhibit perovskite degradation but also leads to the formation of nanochannels, enabling fast charge transfer. As a result, the long‐term stability and performance of MAPbI3 nanowires are considerably improved. The detectivity, linear detection range, and noise equivalent power of the MAPbI3 nanowire PD reach 2.06 × 10 13 Jones, 160 dB, and 1.38 × 10 −15 W Hz −1/2, respectively, comparable to the highest performance of perovskite nanowire PDs reported to date. Moreover, the unencapsulated PD can maintain 100% of its initial performance after being exposed to an open‐air environment for more than 5000 h, establishing it as the most stable perovskite nanowire PD reported to date. Notably, the PD exhibits improved diffuse reflection imaging ability when compared with commercial silicon photodiode S2386. This study provides a new strategy for constructing sensitive, stable, and flexible perovskite PDs and will accelerate their commercial application in the future. Abstract : The poor long‐term stability of perovskite nanowires photodetectors (PDs) hinders its future commercial application. Here, an ionic liquid (BMIMBF4 ) is incorporated into methylammonium lead triiodide (MAPbI3 ) nanowires, resulting in reduced defects, enhanced charge carrier transfer, and improved stability and performance. Remarkably, the unencapsulated MAPbI3 nanowire PDs exhibit ultra‐high stability with no performance attenuation after stored in air for more than 5000 h.