Article
  • Polymer Solar Cells based on a Furan-containing Asymmetric Nonfullerene Acceptor
  • Seunggyun Hong, Chang Eun Song*,**, and Eunhee Lim

  • Department of Chemistry, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Korea
    *Korea Research Institute of Chemical Technology (KRICT), 141 Gajeongro, Yuseong-gu, Daejeon 34114, Korea
    **University of Science and Technology (UST), Daejeon 34113, Korea

  • 퓨란이 도입된 비대칭 비풀러렌계 어셉터를 기반으로 하는 고분자 태양전지
  • 홍승균 · 송창은*,** · 임은희† 

  • 경기대학교 화학과, *한국화학연구원, **한국과학기술연합대학원대학교(UST)

Abstract

An asymmetric nonfullerene small molecule, TF-ORH, containing a nonfused electron-donating core of thiophene, furan and electron-withdrawing octylrhodanine (ORH) end groups was designed as an acceptor for polymer solar cells (PSCs). TF-ORH was synthesized via Knoevenagel condensation and the Suzuki coupling reaction. TF-ORH exhibited sufficient thermal stability and solubility for device fabrication. Compared to solution, TF-ORH film showed a red-shifted UV–Vis absorption with an absorption maximum at 596 nm (J-aggregation), which is complementary with that of the low bandgap polymer donor of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-co-3-fluorothieno[3,4-b]thiophene-2-carboxylate] (PTB7-Th). The introduction of furan elevated the molecular orbital energy levels of TF-ORH compared to the thiophene analog, T2-ORH. Finally, a PSC fabricated using a PTB7-Th:TF-ORH blend film as the active layer exhibited a power conversion efficiency of 1.21% with an open-circuit voltage of 0.88 V and a small energy loss of 0.70 eV.


고분자 태양전지의 어셉터로 비접합된 전자 주는 thiophene-furan 중심과 전자 끄는 옥틸로다닌 말단 그룹으로 이루어진 비대칭 비풀러렌 단분자 TF-ORH가 설계되었다. TF-ORH은 Knoevenagel 축합과 스즈끼 짝지음 반응을 통해 합성되었다. TF-ORH는 소자 제작에 충분한 열 안정성 및 용해도를 나타냈다. 용액과 비교하여, TF-ORH 필름은 596 nm에서 최대 흡수를 가지는 장파장 이동된(J-aggregation) UV-Vis 흡수를 나타내었고, 이는 저밴드갭 고분자 도너인 PTB7-Th의 특성과 상호보완적이다. 퓨란의 도입으로 thiophene 유사체인 T2-ORH와 비교하여 분자 궤도 에너지 준위들은 높아졌다. 활성층으로서 PTB7-Th:TF-ORH 블렌드 필름을 사용하여 제작된 고분자 태양전지 소자는 0.88 V의 개방전압과 0.70 eV의 낮은 에너지 손실로 1.21%의 전력 변환 효율을 나타냈다.


Keywords: organic solar cell, polymer solar cell, non-fullerene acceptor, asymmetrical structure

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2018 Impact Factor : 0.500
  • Indexed in SCIE

This Article

  • 2020; 44(5): 741-746

    Published online Sep 25, 2020

  • 10.7317/pk.2020.44.5.741
  • Received on Jun 16, 2020
  • Revised on Jul 16, 2020
  • Accepted on Jul 22, 2020

Correspondence to

  • Eunhee Lim
  • Department of Chemistry, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Korea

  • E-mail: ehlim@kyonggi.ac.kr