TY - JOUR
T1 - A Benzo[1,2-b:4,5-b′]Difuran Based Donor Polymer Achieving High-Performance (>17%) Single-Junction Organic Solar Cells with a Fill Factor of 80.4%
AU - Yi, Jicheng
AU - Pan, Mingao
AU - Chen, Lu
AU - Chen, Yuzhong
AU - Angunawela, Indunil Chathurangani
AU - Luo, Siwei
AU - Zhang, Ting
AU - Zeng, Anping
AU - Chen, Jian
AU - Qi, Zhenyu
AU - Yu, Han
AU - Liu, Wei
AU - Lai, Joshua Yuk Lin
AU - Kim, Ha Kyung
AU - Zhu, Xunjin
AU - Ade, Harald
AU - Lin, Haoran
AU - Yan, He
N1 - Funding Information:
J.Y., M.P., L.C., and Y.C. contributed equally to this work. H.Y. appreciates the support from the National Key Research and Development Program of China (No. 2019YFA0705900) funded by MOST, the Basic and Applied Research Major Program of Guangdong Province (No. 2019B030302007), National Natural Science Foundation of China (NSFC, No. 22075057), the Shen Zhen Technology and Innovation Commission through (Shenzhen Fundamental Research Program, JCYJ20200109140801751), the Hong Kong Research Grants Council (CRF project C6023‐19G, GRF project 16310019, 16310020, 16309221), Hong Kong Innovation and Technology Commission (ITC‐CNERC14SC01) and Foshan ‐HKUST Project No. FSUST19‐CAT0202. X‐ray data acquisition and manuscript input by NCSU authors supported by ONR grant N000142012155. X‐ray data were acquired at the Advanced Light Source, which was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract DE‐AC02‐05CH11231. The authors thank Mr. Huifeng Meng and Prof. Xiaopeng Xu in Prof. Qiang Peng's group, Sichuan University for the device fabrication and measurement to further convince the authors’ results.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - In the field of non-fullerene organic solar cells (OSCs), most of the promising polymer donors are based on benzo[1,2-b:4,5-b′]dithiophene (BDT) units while benzo[1,2-b:4,5-b′]difuran (BDF)-based polymers have drawn less attention since the efficiencies of BDF polymer-based devices are generally lower than those of BDT polymer-based ones. In this contribution, the BDT unit in a polymer donor named D18 is replaced with a BDF unit, and a new polymer named D18-Fu is synthesized. As a highly-crystalline molecule named Y6-1O is chosen as the acceptor, the efficiency of binary devices based on D18-Fu can reach 16.38%. Furthermore, when one of fullerene derivatives PC71BM is added, the ternary devices based on D18-Fu achieve an efficiency of 17.07% and a high fill factor (FF) of 80.4%, both of which are the highest values among those of BDF polymer-based devices. For comparison, D18-based ternary devices show an inferior efficiency of 15.61% mainly due to the lower FF of 73.9%. Subsequent characterization reveals that D18-Fu possesses a more coplanar molecular geometry, leading to better morphology and higher charge mobility for a promising FF. The high performance shown in this work demonstrates the potential role of BDF units in the design of polymer donors for highly efficient OSCs.
AB - In the field of non-fullerene organic solar cells (OSCs), most of the promising polymer donors are based on benzo[1,2-b:4,5-b′]dithiophene (BDT) units while benzo[1,2-b:4,5-b′]difuran (BDF)-based polymers have drawn less attention since the efficiencies of BDF polymer-based devices are generally lower than those of BDT polymer-based ones. In this contribution, the BDT unit in a polymer donor named D18 is replaced with a BDF unit, and a new polymer named D18-Fu is synthesized. As a highly-crystalline molecule named Y6-1O is chosen as the acceptor, the efficiency of binary devices based on D18-Fu can reach 16.38%. Furthermore, when one of fullerene derivatives PC71BM is added, the ternary devices based on D18-Fu achieve an efficiency of 17.07% and a high fill factor (FF) of 80.4%, both of which are the highest values among those of BDF polymer-based devices. For comparison, D18-based ternary devices show an inferior efficiency of 15.61% mainly due to the lower FF of 73.9%. Subsequent characterization reveals that D18-Fu possesses a more coplanar molecular geometry, leading to better morphology and higher charge mobility for a promising FF. The high performance shown in this work demonstrates the potential role of BDF units in the design of polymer donors for highly efficient OSCs.
KW - benzo[1,2-b:4,5-b′]difuran
KW - fill factors
KW - morphology
KW - organic solar cells
KW - polymer donors
UR - http://www.scopus.com/inward/record.url?scp=85134234319&partnerID=8YFLogxK
U2 - 10.1002/aenm.202201850
DO - 10.1002/aenm.202201850
M3 - Journal article
AN - SCOPUS:85134234319
SN - 1614-6832
VL - 12
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 33
M1 - 2201850
ER -
