Enhanced and controllable open-circuit voltage using 2D-conjugated benzodithiophene (BDT) homopolymers by alkylthio substitution
- Authors
- Kim, Ji-Hoon; Park, Jong Baek; Yoon, Sung Cheol; Jung, In Hwan; Hwang, Do-Hoon
- Issue Date
- Mar-2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.4, no.11, pp.2170 - 2177
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 4
- Number
- 11
- Start Page
- 2170
- End Page
- 2177
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/23872
- DOI
- 10.1039/c5tc04449a
- ISSN
- 2050-7526
- Abstract
- In this study, we explore the effects of alkylthiophene (T) and alkylthiothiophene (T-S) substituents on the benzo[1,2-b; 4,5-b']dithiophene (BDT) unit by comparing the BDTT homopolymer (PBDTT), the BDTT-alt-BDTT-S copolymer (PBDTT-BDTT-S), and the BDTT-S homopolymer (PBDTT-S) in terms of UV-visible absorption spectra, cyclic voltammetry (CV) results, computational calculations, and experimental results. The T-S substituent increased the hole mobility of the polymer and down-shifted the highest occupied molecular orbital (HOMO) energy level of the polymer, leading to slight red-shifting of the absorption spectrum. The organic photovoltaic (OPV) cells based on PBDTT-S as a donor and [6,6]-phenyl-C-71-butylic acid methyl ester (PC71BM) as an acceptor demonstrated a high power conversion efficiency (PCE) of 7.05% under AM 1.5G illumination (100 mW cm(-2)). To the best of our knowledge, this PCE value is one of the highest values reported for homopolymer donor-based OPVs. Compared to the well-known P3HT homopolymer, which shows a similar absorption profile, PBDTT-S is a promising candidate for organic photodiodes.
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