Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201801214
Keywords
high performance; NIR nonfullerene acceptors; polymer solar cells; wide bandgap polymers
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Funding
- Asian Office of Aerospace RD [FA2386-15-1-4106]
- Office of Naval Research [N00014-17-1-2201]
- NSFC of China [51673092]
- National Science Fund for Distinguished Young Scholars [51425304]
- Young 1000 Talents Global Recruitment Program of China
- China Scholarship Council
- DOE, Office of Science
- DOE, Office of Basic Energy Sciences
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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.
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