TY - JOUR
T1 - High-Performance All-Polymer Solar Cells Enabled by n-Type Polymers with an Ultranarrow Bandgap Down to 1.28 eV
AU - Feng, Kui
AU - Huang, Jiachen
AU - Zhang, Xianhe
AU - Wu, Ziang
AU - Shi, Shengbin
AU - Thomsen, Lars
AU - Tian, Yanqing
AU - Woo, Han Young
AU - McNeill, Christopher R.
AU - Guo, Xugang
N1 - Funding Information:
K.F. acknowledges the financial support by the China Postdoctoral Science Foundation (Grant No. 2019M662696) and Shenzhen Basic Research Fund (Grant No. JCYJ20190809162003662). X.G. is thankful for the financial support by the Shenzhen Basic Research Fund (Grant Nos. JCYJ20170817105905899 and JCYJ20180504165709042). This research used the Spectroscopy Soft and Tender (SST‐1) beamline of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE‐SC0012704. C.R.M. acknowledges travel funding provided by the International Synchrotron Access Program (ISAP) managed by the Australian Synchrotron, part of ANSTO, and funded by the Australian Government. This work was performed in part at the Soft X‐ray Beamline at the Australian Synchrotron, part of ANSTO. C.R.M. thanks Eliot Gann for assistance with R‐SoXS measurements. H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF‐2016M1A2A2940911 and 2019R1A6A1A11044070). The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work.
Funding Information:
K.F. acknowledges the financial support by the China Postdoctoral Science Foundation (Grant No. 2019M662696) and Shenzhen Basic Research Fund (Grant No. JCYJ20190809162003662). X.G. is thankful for the financial support by the Shenzhen Basic Research Fund (Grant Nos. JCYJ20170817105905899 and JCYJ20180504165709042). This research used the Spectroscopy Soft and Tender (SST-1) beamline of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. C.R.M. acknowledges travel funding provided by the International Synchrotron Access Program (ISAP) managed by the Australian Synchrotron, part of ANSTO, and funded by the Australian Government. This work was performed in part at the Soft X-ray Beamline at the Australian Synchrotron, part of ANSTO. C.R.M. thanks Eliot Gann for assistance with R-SoXS measurements. H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070). The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Compared to organic solar cells based on narrow-bandgap nonfullerene small-molecule acceptors, the performance of all-polymer solar cells (all-PSCs) lags much behind due to the lack of high-performance n-type polymers, which should have low-aligned frontier molecular orbital levels and narrow bandgap with broad and intense absorption extended to the near-infrared region. Herein, two novel polymer acceptors, DCNBT-TPC and DCNBT-TPIC, are synthesized with ultranarrow bandgaps (ultra-NBG) of 1.38 and 1.28 eV, respectively. When applied in transistors, both polymers show efficient charge transport with a highest electron mobility of 1.72 cm2 V−1 s−1 obtained for DCNBT-TPC. Blended with a polymer donor, PBDTTT-E-T, the resultant all-PSCs based on DCNBT-TPC and DCNBT-TPIC achieve remarkable power conversion efficiencies (PCEs) of 9.26% and 10.22% with short-circuit currents up to 19.44 and 22.52 mA cm−2, respectively. This is the first example that a PCE of over 10% can be achieved using ultra-NBG polymer acceptors with a photoresponse reaching 950 nm in all-PSCs. These results demonstrate that ultra-NBG polymer acceptors, in line with nonfullerene small-molecule acceptors, are also available as a highly promising class of electron acceptors for maximizing device performance in all-PSCs.
AB - Compared to organic solar cells based on narrow-bandgap nonfullerene small-molecule acceptors, the performance of all-polymer solar cells (all-PSCs) lags much behind due to the lack of high-performance n-type polymers, which should have low-aligned frontier molecular orbital levels and narrow bandgap with broad and intense absorption extended to the near-infrared region. Herein, two novel polymer acceptors, DCNBT-TPC and DCNBT-TPIC, are synthesized with ultranarrow bandgaps (ultra-NBG) of 1.38 and 1.28 eV, respectively. When applied in transistors, both polymers show efficient charge transport with a highest electron mobility of 1.72 cm2 V−1 s−1 obtained for DCNBT-TPC. Blended with a polymer donor, PBDTTT-E-T, the resultant all-PSCs based on DCNBT-TPC and DCNBT-TPIC achieve remarkable power conversion efficiencies (PCEs) of 9.26% and 10.22% with short-circuit currents up to 19.44 and 22.52 mA cm−2, respectively. This is the first example that a PCE of over 10% can be achieved using ultra-NBG polymer acceptors with a photoresponse reaching 950 nm in all-PSCs. These results demonstrate that ultra-NBG polymer acceptors, in line with nonfullerene small-molecule acceptors, are also available as a highly promising class of electron acceptors for maximizing device performance in all-PSCs.
KW - all-polymer solar cells
KW - electron mobility
KW - n-type polymers
KW - power conversion efficiency
KW - ultranarrow bandgap
UR - http://www.scopus.com/inward/record.url?scp=85086131323&partnerID=8YFLogxK
U2 - 10.1002/adma.202001476
DO - 10.1002/adma.202001476
M3 - Article
C2 - 32519429
AN - SCOPUS:85086131323
VL - 32
JO - Advanced Materials
JF - Advanced Materials
SN - 0935-9648
IS - 30
M1 - 2001476
ER -