TY - JOUR
T1 - Comparison of Linear- And Star-Shaped Fused-Ring Electron Acceptors
AU - Cai, Guilong
AU - Wang, Wei
AU - Zhou, Jiadong
AU - Xiao, Yiqun
AU - Liu, Kuan
AU - Xie, Zengqi
AU - Lu, Xinhui
AU - Lian, Jiarong
AU - Zeng, Pengju
AU - Wang, Yiping
AU - Zhan, Xiaowei
N1 - Funding Information:
X.Z. thanks NSFC (21734001 and 51761165023). Z.X. thanks the financial support from NSFC (21733005 and 51761135101). X.L. acknowledges the financial support from NSFC/RGC Joint Research Scheme (Grant No. N_CUHK418/17).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/9/3
Y1 - 2019/9/3
N2 - A star-shaped nonfullerene electron acceptor, FBTIC, and a linear-shaped nonfullerene acceptor, FBDIC, with the same electron-deficient end groups and p-hexylphenyl side chains but different fused-ring electron-rich cores (benzotrithiophene and benzodithiophene) are designed, synthesized, and compared. Terminal groups 2FIC in FBTIC form intermolecular π-πstacking, leading to the complex 3D conjugated framework, while 2FIC units in FBDIC form double hydrogen bonding. Relative to that of FBDIC, FBTIC shows an 81 nm blue-shifted absorption, a 0.21 eV larger optical bandgap, a 0.13 eV lower highest occupied molecular orbital, a 0.1 eV higher lowest unoccupied molecular orbital, and double electron mobility. Paired with the donor PM6, the optimized PM6/FBDIC-based organic photovoltaic cells show an efficiency of 12.3%, while the cells based on PM6/FBTIC exhibit an efficiency of 10.1% with a fill factor of 75.4%, much better than those of the reported star-shaped fused-ring electron acceptors.
AB - A star-shaped nonfullerene electron acceptor, FBTIC, and a linear-shaped nonfullerene acceptor, FBDIC, with the same electron-deficient end groups and p-hexylphenyl side chains but different fused-ring electron-rich cores (benzotrithiophene and benzodithiophene) are designed, synthesized, and compared. Terminal groups 2FIC in FBTIC form intermolecular π-πstacking, leading to the complex 3D conjugated framework, while 2FIC units in FBDIC form double hydrogen bonding. Relative to that of FBDIC, FBTIC shows an 81 nm blue-shifted absorption, a 0.21 eV larger optical bandgap, a 0.13 eV lower highest occupied molecular orbital, a 0.1 eV higher lowest unoccupied molecular orbital, and double electron mobility. Paired with the donor PM6, the optimized PM6/FBDIC-based organic photovoltaic cells show an efficiency of 12.3%, while the cells based on PM6/FBTIC exhibit an efficiency of 10.1% with a fill factor of 75.4%, much better than those of the reported star-shaped fused-ring electron acceptors.
UR - http://www.scopus.com/inward/record.url?scp=85074407918&partnerID=8YFLogxK
U2 - 10.1021/acsmaterialslett.9b00253
DO - 10.1021/acsmaterialslett.9b00253
M3 - Journal article
AN - SCOPUS:85074407918
SN - 2639-4979
VL - 1
SP - 367
EP - 374
JO - ACS Materials Letters
JF - ACS Materials Letters
IS - 3
ER -
