TY - JOUR
T1 - Influence of Alkyl Substitution Position on Wide-Bandgap Polymers in High-Efficiency Nonfullerene Polymer Solar Cells
AU - Guo, Qing
AU - Li, Wanbin
AU - Li, Guangda
AU - Wang, Kun
AU - Guo, Xia
AU - Zhang, Maojie
AU - Li, Yongfang
AU - Wong, Wai Yeung
N1 - Funding Information:
Q.G. and W.B.L. contributed equally to this work. This work was supported by National Natural Science Foundation of China (NSFC) (Nos. 51573120, 51773142, 51873176, and 51973146), Jiangsu Provincial Natural Science Foundation (Grant No. BK20190099), Collaborative Innovation Center of Suzhou Nano Science & Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions. W.‐Y.W. acknowledges the financial support from the Science, Technology and Innovation Committee of Shenzhen Municipality (No. JCYJ20180507183413211), Hong Kong Research Grants Council (No. PolyU123384116P), the Hong Kong Polytechnic University (1‐ZEIC), and Clarea Au for the Endowed Professorship in Energy (847S). This work was also supported by the Science and Technology Innovative Talents in Universities of Henan Province (No. 20HASTIT030), Henan Province Science and Technology Planning Project (No. 182102210530), the Training Plan of Young Backbone Teachers in Colleges and Universities of Henan Province (No. 2019GGJS141), Key Scientific Research Projects of Higher Education Institutions of Henan Province (No. 20B150032), Science and technology guidance program of China Textile Industry Federation (No. 2019008), Scientific research project of Zhongyuan University of Technology (No. K2019YY001), Youth Backbone Teachers Funding Planning of Zhongyuan University of Technology.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Two wide-bandgap (WBG) conjugated polymers (PBPD-p and PBPD-m) based on phenyl-substituted benzodithiophene (BDT) with the different substitution position of the alkyl side chain and benzodithiophene-4,8-dione (BDD) units are designed and synthesized to investigate the influence of alkyl substitution position on the photovoltaic performance of polymers in polymer solar cells (PSCs). The thermogravimetric analysis, absorption spectroscopy, molecular energy level, X-ray diffraction, charge transport and photovoltaic performance of the polymers are systematically studied. Compared with PBPD-p, PBPD-m exhibits a slight blue-shift but a deeper highest occupied molecular orbital (HOMO) energy level, a tighter alkyl chain packing and a higher hole mobility. The PBPD-m-based PSCs blended with acceptor IT-4F shows a higher power conversion efficiency (PCE) of 11.95% with a high open-circuit voltage (Voc) of 0.88 V, a short-circuit current density (Jsc) of 19.76 mA cm−2 and a fill factor (FF) of 68.7% when compared with the PCE of 6.97% with a Voc of 0.81 V, a Jsc of 15.97 mA cm−2 and an FF of 53.9% for PBPD-p. These results suggest that it is a feasible and effective strategy to optimize photovoltaic properties of WBG polymers by changing the substitution position of alkyl side chain in PSCs.
AB - Two wide-bandgap (WBG) conjugated polymers (PBPD-p and PBPD-m) based on phenyl-substituted benzodithiophene (BDT) with the different substitution position of the alkyl side chain and benzodithiophene-4,8-dione (BDD) units are designed and synthesized to investigate the influence of alkyl substitution position on the photovoltaic performance of polymers in polymer solar cells (PSCs). The thermogravimetric analysis, absorption spectroscopy, molecular energy level, X-ray diffraction, charge transport and photovoltaic performance of the polymers are systematically studied. Compared with PBPD-p, PBPD-m exhibits a slight blue-shift but a deeper highest occupied molecular orbital (HOMO) energy level, a tighter alkyl chain packing and a higher hole mobility. The PBPD-m-based PSCs blended with acceptor IT-4F shows a higher power conversion efficiency (PCE) of 11.95% with a high open-circuit voltage (Voc) of 0.88 V, a short-circuit current density (Jsc) of 19.76 mA cm−2 and a fill factor (FF) of 68.7% when compared with the PCE of 6.97% with a Voc of 0.81 V, a Jsc of 15.97 mA cm−2 and an FF of 53.9% for PBPD-p. These results suggest that it is a feasible and effective strategy to optimize photovoltaic properties of WBG polymers by changing the substitution position of alkyl side chain in PSCs.
KW - alkyl side chains
KW - benzodithiophene-4,8-dione
KW - nonfullerene polymer solar cells
KW - substitution positions
KW - wide bandgap polymers
UR - http://www.scopus.com/inward/record.url?scp=85089146641&partnerID=8YFLogxK
U2 - 10.1002/marc.202000170
DO - 10.1002/marc.202000170
M3 - Journal article
C2 - 32776395
AN - SCOPUS:85089146641
VL - 41
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
SN - 1022-1336
IS - 21
M1 - 2000170
ER -