Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Optimizing ionic strength of interfacial electric double layer for ultrahigh external quantum efficiency of photomultiplication-type organic photodetectors

Authors
Kang, MingyunHarit, Amit KumarWoo, Han YoungChung, Dae Sung
Issue Date
20-10월-2022
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY C, v.10, no.40, pp.15160 - 15167
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY C
Volume
10
Number
40
Start Page
15160
End Page
15167
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/145661
DOI
10.1039/d2tc03335f
ISSN
2050-7526
Abstract
A synthetic approach for engineering an electric double layer (EDL)-photoactive layer interface in photomultiplication-type organic photodetectors (PM-OPDs), whereby the EDL is strategically embedded between a transparent cathode and the photoactive layer to enhance the photomultiplication mechanism, is demonstrated. To elucidate the effects of the EDL on the PM-OPD performances, a series of conjugated polyelectrolytes (CPE), which form EDLs in solid-state films, based on a poly(fluorene-co-phenylene) backbone, are synthesized by varying ionic densities of quaternary ammonium cations and bromide counterions (per polymer repeat unit). Together with inherent characteristics of the CPE EDL, including modifications in the work function of the transparent cathode suitable for Schottky junction formation and the development of a favorable morphological environment for on-coated polymer semiconductors to exhibit preferential orientations and form defectless films, we find an increase in the EDL ionic density improves the electron trapping ability, affording efficient gain generation. The optimized PM-OPD with the highest ionic density exhibits a record high external quantum efficiency of 4 440 000%, responsivity of 18 700 A W-1, and gain-bandwidth product of 1.98 x 10(7) Hz as well as an exceptionally large specific detectivity of 3.09 x 10(14) Jones. This work contributes toward further improvements in PM-OPDs, particularly by adjusting the electrostatic environment.
Files in This Item
There are no files associated with this item.
Appears in
Collections
College of Science > Department of Chemistry > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Altmetrics

Total Views & Downloads

BROWSE