TY - JOUR
T1 - Mapping Nonfullerene Acceptors with a Novel Wide Bandgap Polymer for High Performance Polymer Solar Cells
AU - Liao, Xunfan
AU - Yao, Zhaoyang
AU - Gao, Ke
AU - Shi, Xueliang
AU - Zuo, Lijian
AU - Zhu, Zonglong
AU - Chen, Lie
AU - Liu, Feng
AU - Chen, Yiwang
AU - Jen, Alex K.Y.
N1 - Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/8/27
Y1 - 2018/8/27
N2 - A new weak electron-deficient building block, bis(2-ethylhexyl) 2,5-bis(5-bromothiophen-2-yl) thieno[3,2-b]thiophene-3,6-dicarboxylate (TT-Th), is incorporated to construct a wide-bandgap (1.88 eV) polymer PBDT-TT for nonfullerene polymer solar cells (NF-PSCs). PBDT-TT possesses suitable energy levels and complementary absorption when blended with both ITIC analogues (ITIC and IT-M) and a near-infrared (NIR) acceptor (6TIC). Moreover, PBDT-TT exhibits good conjugated planarity and preferable face-on orientation in the blended thin film, which are beneficial for charge transfer and carrier transport. The PSCs based on PBDT-TT:IT-M and PBDT-TT:6TIC blend films yield high power conversion efficiencies of 11.38% and 11.03%, respectively. To the best of the authors' knowledge, the PCE of 11.03% for PBDT-TT:6TIC-based device is one of the highest values reported for NIR NF-PSCs. This work demonstrates that TT-Th is a useful new electron-accepting building block for making p-type wide bandgap polymers for efficient NIR NF-PSCs.
AB - A new weak electron-deficient building block, bis(2-ethylhexyl) 2,5-bis(5-bromothiophen-2-yl) thieno[3,2-b]thiophene-3,6-dicarboxylate (TT-Th), is incorporated to construct a wide-bandgap (1.88 eV) polymer PBDT-TT for nonfullerene polymer solar cells (NF-PSCs). PBDT-TT possesses suitable energy levels and complementary absorption when blended with both ITIC analogues (ITIC and IT-M) and a near-infrared (NIR) acceptor (6TIC). Moreover, PBDT-TT exhibits good conjugated planarity and preferable face-on orientation in the blended thin film, which are beneficial for charge transfer and carrier transport. The PSCs based on PBDT-TT:IT-M and PBDT-TT:6TIC blend films yield high power conversion efficiencies of 11.38% and 11.03%, respectively. To the best of the authors' knowledge, the PCE of 11.03% for PBDT-TT:6TIC-based device is one of the highest values reported for NIR NF-PSCs. This work demonstrates that TT-Th is a useful new electron-accepting building block for making p-type wide bandgap polymers for efficient NIR NF-PSCs.
KW - NIR nonfullerene acceptors
KW - high performance
KW - polymer solar cells
KW - wide bandgap polymers
UR - https://www.scopus.com/pages/publications/85051700058
U2 - 10.1002/aenm.201801214
DO - 10.1002/aenm.201801214
M3 - 文章
AN - SCOPUS:85051700058
SN - 1614-6832
VL - 8
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 24
M1 - 1801214
ER -
