Cited time in webofscience Cited time in scopus

Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells

Title
Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells
Author(s)
Hwang, Jae YoungPark, Jeong HunKim, Yu JinHa, Yeon HeePark, Chan EonChung, Dae SungKwon, Soon KiKim, Yun Hi
DGIST Authors
Hwang, Jae YoungPark, Jeong HunKim, Yu JinHa, Yeon HeePark, Chan EonChung, Dae SungKwon, Soon KiKim, Yun Hi
Issued Date
2017-03
Type
Article
Article Type
Article
Keywords
FIELD-EFFECT TRANSISTORSCONJUGATED POLYMERSCHARGE-TRANSPORTPHOTOVOLTAICS
ISSN
0897-4756
Abstract
The organic solar cell (OSC) performance of a series of new donor-acceptor copolymers containing indolo[3,2-b]indole as a key donor block and benzothiadiazole (BT) units with various degrees of fluorination as acceptors is reported. Compared with the simple carbazole unit, the strategically developed indolo[3,2-b]indole unit is found to significantly extend π-conjugation and thus increase the intermolecular interactions of the resulting copolymer, as probed by density functional theory calculations, photophysical studies, and structural/morphological analyses. In addition, fluorination of BT can facilitate nanostructuring of the copolymers, mainly due to further planarization of the backbone, which leads to apparently higher hole/electron charge carrier mobilities. The OSC properties of this series of new copolymers blended with fullerene show a strong dependence on the fine and continuous fibrous nanostructure of the blend film. The indolo[3,2-b]indole-based copolymer with singly fluorinated BT units possesses optimal intermolecular interactions and achieves the highest power conversion efficiency of 8.84% under AM 1.5G illumination. This result shows the potential of π-extended carbazole moieties for achieving high-performance OSCs with many of the favorable properties induced by large heteroacene blocks. © 2017 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5654
DOI
10.1021/acs.chemmater.6b04745
Publisher
American Chemical Society
Files in This Item:

There are no files associated with this item.

Appears in Collections:
Department of Energy Science and Engineering Polymer Energy Materials Lab 1. Journal Articles

qrcode

  • twitter
  • facebook
  • mendeley

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

BROWSE