Dramatic Responsivity Enhancement Through Concentrated H2SO4 Treatment on PEDOT:PSS/TiO2 Heterojunction Fibrous Photodetectors. Issue 37 (3rd August 2021)

• Record Type: Journal Article
• Authors: Deng, Xiaolei; Li, Ziliang; Liu, Hui; Zhao, Yijian; Zheng, Lingxia; Shi, Xiaowei; Wang, Liang; Fang, Xiaosheng; Zheng, Huajun
• Is Part Of: Small. Volume 17:Issue 37(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-03
• Subjects: acid treatment -- fiber photodetectors -- PEDOT:PSS/TiO 2 heterojunction -- responsivity enhancement -- self‐powered photodetectors; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202101674
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: In order to satisfy the growing requirements of wearable electronic devices, 1D fiber‐shaped devices with outstanding sensitivity, flexibility, and stability are urgently needed. In this study, a novel inorganic‐organic heterojunction fibrous photodetector (FPD) based on poly(3, 4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and highly ordered TiO2 nanotube array is fabricated, which endows a high responsivity, large external quantum efficiency, and fast response speed at 3 V bias. To further ameliorate its performance in the self‐powered mode, a facile acid treatment is adopted and the assembled H‐PEDOT:PSS/TiO2 FPD demonstrates outstanding self‐powered properties with ≈3000% responsivity enhancement (161 mA W −1 at 0 V under 365 nm irradiation, photocurrent enhancement of ≈50 times) compared with the untreated device. It is found that the concentrated H2 SO4 post‐treatment helps decrease the tube wall thickness of TiO2 and partially removes the insulated PSS component in PEDOT:PSS, leading to enhanced conductivity and facilitated charge transportation, and thereby superb responsivity/photocurrent enhancement of self‐powered H‐PEDOT:PSS/TiO2 FPD. This low‐cost and high‐performance self‐powered FPD shows high potential for applications in wearable electronic devices. Abstract : Superb responsivity enhancement of ≈3000% (161 mA W −1 at 0 V under 365 nm UV irradiation) is accomplished on self‐powered H‐PEDOT:PSS/TiO2 fibrous photodetector owing to the enhanced conductivity, strengthened junction effect, and facilitated charge transportation, demonstrating potential applications for wearable/flexible electronic devices.