TY - JOUR
T1 - Fluorinated oligothiophene donors for high-performance nonfullerene small-molecule organic solar cells
AU - Xu, Tongle
AU - Chang, Yuying
AU - Yan, Cenqi
AU - Yang, Qianguang
AU - Kan, Zhipeng
AU - Singh, Ranbir
AU - Kumar, Manish
AU - Li, Gang
AU - Lu, Shirong
AU - Duan, Tainan
N1 - Funding Information:
This work was nancially supported by National Youth Thousand Program Project (R52A199Z11), National Special Funds for Repairing and Purchasing Scientic Institutions (Y72Z090Q10), “Articial Intelligence” Key Project of Chongqing (No. cstc2017rgzn-zdyfX0030), National Natural Science Foundation of China (No. 61805245, 21702202 and 51873160), Youth Innovation Promotion Association CAS (No. 2019373), CAS Pioneer Hundred Talents Program (Y82A060Q10, Y92A160Q10, E029610201), Natural Science Foundation of Chongqing (cstc2019jcyj-msxm2027). T. Xu and Y. Chang contributed equally to this work.
Publisher Copyright:
© The Royal Society of Chemistry 2020.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/6
Y1 - 2020/6
N2 - Thiophene is widely used in organic photovoltaics due to its excellent charge transport properties, simple synthesis, and high stability. In this paper, two simple oligothiophenes, namely,DC5Tand2FDC5Twith rhodanine-flanked structures were synthesized and used as donors in nonfullerene small-molecule organic solar cells (NSM-OSCs). Compared toDC5T,2FDC5Twith fluorine atoms substituted on the conjugated backbone exhibited a downshifted highest occupied molecular orbital (HOMO) energy level and blue-shifted light absorption. WithIDIC-4Fas a small-molecule acceptor, the2FDC5T-based device exhibited much higher short-circuit current density and open-circuit voltage than theDC5T-based device. As a result, a promising power conversion efficiency (PCE) of 9.02% was achieved for the2FDC5T/IDIC-4Fdevice, which was 28% higher than that of theDC5T/IDIC-4Fdevice (PCE = 7.03%). Further research indicated that fluorination on the oligothiophene donor assisted the optimization of the active layer morphology and the reduction in the trap-assisted recombination in the device, which could deeply explain the improvement in efficiency.
AB - Thiophene is widely used in organic photovoltaics due to its excellent charge transport properties, simple synthesis, and high stability. In this paper, two simple oligothiophenes, namely,DC5Tand2FDC5Twith rhodanine-flanked structures were synthesized and used as donors in nonfullerene small-molecule organic solar cells (NSM-OSCs). Compared toDC5T,2FDC5Twith fluorine atoms substituted on the conjugated backbone exhibited a downshifted highest occupied molecular orbital (HOMO) energy level and blue-shifted light absorption. WithIDIC-4Fas a small-molecule acceptor, the2FDC5T-based device exhibited much higher short-circuit current density and open-circuit voltage than theDC5T-based device. As a result, a promising power conversion efficiency (PCE) of 9.02% was achieved for the2FDC5T/IDIC-4Fdevice, which was 28% higher than that of theDC5T/IDIC-4Fdevice (PCE = 7.03%). Further research indicated that fluorination on the oligothiophene donor assisted the optimization of the active layer morphology and the reduction in the trap-assisted recombination in the device, which could deeply explain the improvement in efficiency.
UR - http://www.scopus.com/inward/record.url?scp=85086000411&partnerID=8YFLogxK
U2 - 10.1039/d0se00335b
DO - 10.1039/d0se00335b
M3 - Journal article
AN - SCOPUS:85086000411
VL - 4
SP - 2680
EP - 2685
JO - Sustainable Energy and Fuels
JF - Sustainable Energy and Fuels
SN - 2398-4902
IS - 6
ER -