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High-Performance and Stable Nonfullerene Acceptor-Based Organic Solar Cells for Indoor to Outdoor Light

Authors
Park, SungminAhn, HyungjuKim, Ji-yeongPark, Jong BaekKim, JunghwanIm, Sang HyukSon, Hae Jung
Issue Date
1월-2020
Publisher
AMER CHEMICAL SOC
Citation
ACS ENERGY LETTERS, v.5, no.1, pp.170 - 179
Indexed
SCIE
SCOPUS
Journal Title
ACS ENERGY LETTERS
Volume
5
Number
1
Start Page
170
End Page
179
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58532
DOI
10.1021/acsenergylett.9b01819
ISSN
2380-8195
Abstract
We synthesized a donor polymer of bis(2-ethylhexyl)thiophene-substituted benzodithiophene (BDT-Th) and 1,3-bis (2-ethylhexyl)-5,7-di(thiophene-2-yl)-benzo[1,2-c:4,5-c'] dithiophene-4,8-dione, for which the BDT-Th unit includes chlorine and sulfur-bridged 2-ethylhexyl in the thiophene side group. When compared with PBDB-TF, which includes fluorine and 2-ethylhexyl in BDT-Th, PBDB-TSC1 shows more efficient exciton dissociation and charge generation, which is probably because large dipole moment changes from ground to excited states lead to reduced exciton binding energy. Consequently, despite a small donor-acceptor interface in the bulk heterojunction (BHJ) film, PBDB-TSCI achieves higher photovoltaic performance than PBDB-TF under various light intensities; PBDB-TSC1 achieved higher efficiency (13.13%) than the 12.12% of PBDB-TF under 1 sun illumination. Moreover, PBDB-TSCI showed the highest efficiency of 21.53% with fill factor (FF) of 76.29% under a 500 lx fluorescence lamp, whereas PBDB-TF has lower efficiency of 15.57% with FF of 65.25%. Furthermore, the PBDB-TSCI device shows improved thermal stability due to the more stabilized morphology of its BHJ film.
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