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Reactive Dedoping of Polymer Semiconductors to Boost Self-Powered Schottky Diode Performances

Title
Reactive Dedoping of Polymer Semiconductors to Boost Self-Powered Schottky Diode Performances
Authors
Kang, MingyunYoon, SeongwonCho, JangwhanKim, JuheeChung, Dae Sung
DGIST Authors
Chung, Dae Sung
Issue Date
2019-02
Citation
ACS Applied Materials and Interfaces, 11(8), 8365-8373
Type
Article
Article Type
Article
Author Keyword
self-powered; dedoping; organic photodiode; Schottky diode; high-performance; green-selective
Keyword
Electric fields; Photodiodes; Photons; Schottky barrier diodes; Semiconductor diodes; Semiconductor doping; Ultraviolet photoelectron spectroscopy; De-doping; green-selective; high-performance; Organic photodiodes; Schottky diodes; Self-powered; Semiconductor junctions
ISSN
1944-8244
Abstract
A facile and strategic junction tuning technology is reported to boost self-powered organic Schottky photodiode (OPD) performances by synergetic contributions of reactive dedoping effects. It is shown that dedoping poly(3-hexylthiophene-2,5-diyl) (P3HT) films with 1-propylamine (PA) solution significantly reduces not only acceptor-defect density but also intrinsic doping level, leading to dramatically enlarged depletion width of metal/polymer Schottky junctions, as confirmed by ultraviolet photoelectron spectroscopy and Mott-Schottky junction analyses. As a result, whole penetration regions of photons corresponding to absorption bands of P3HT can be fully covered by the depletion region of Schottky junctions, even without the assistance of external electric fields. In addition, it is shown that non-solvent exposure effects of PA dedoping further enable lower paracrystalline disorder and, thus, higher charge carrier mobility, by means of grazing incidence X-ray diffraction, field-effect mobility, and space-charge-limited current analyses. As a result of such synergetic advantages of the PA dedoping method, non-power-driven green-selective OPDs were demonstrated with a high specific detectivity exceeding 6 × 10 12 Jones and a low noise-equivalent power of 5.05 × 10 -14 W Hz -0.5 . Together with a fast temporal response of 26.9 μs and a wide linear dynamic range of 201 dB, the possibility of realizing non-power-driven, near-ideal optimization of solution-processed OPDs with a facile dedoping method is demonstrated. Copyright © 2019 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9675
DOI
10.1021/acsami.9b00889
Publisher
American Chemical Society
Related Researcher
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringPolymer Energy Materials Lab1. Journal Articles


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