Eco-Friendly Solvent-Processed Fullerene-Free Polymer Solar Cells with over 9.7% Efficiency and Long-Term Performance Stability

Gi Eun Park, Suna Choi, Seo Yeon Park, Dae Hee Lee, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)


A wide-bandgap polymer, (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(2,5-(methyl thiophene carboxylate))]) (3MT-Th), is synthesized to obtain a complementary broad range absorption when harmonized with 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC). The synthesized regiorandom 3MT-Th polymer shows good solubility in nonhalogenated solvents. A film of 3MT-Th:ITIC can be employed for forming an active layer in a polymer solar cell (PSC), with the blend solution containing toluene with 0.25% diphenylether as a nonhalogenated additive. The corresponding PSC devices display a power conversion efficiency of 9.73%. Moreover, the 3MT-Th-based PSCs exhibit excellent shelf-life time of over 1000 h and are operationally stable under continuous light illumination. Therefore, methyl thiophene-3-carboxylate in 3MT-Th is a promising new accepting unit for constructing p-type polymers used for high-performance nonfullerene-type PSCs.

Original languageEnglish
Article number1700566
JournalAdvanced Energy Materials
Issue number19
Publication statusPublished - 2017 Oct 11

Bibliographical note

Funding Information:
This research was supported by National Research Foundation of Korea (NRF2012R1A2A1A01008797) and by Key Research Institute Program (NRF20100020209). The authors are grateful to Pohang Accelerator Laboratory (Pohang, Korea) for allowing to conduct the grazing incidence X-ray diffraction (GI-XRD) measurements.

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • large bandgap polymer
  • nonfullerene solar cells
  • nonhalogenated solvents
  • polymer solar cells
  • stability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science


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