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Regioisomeric Effects of Donor–Acceptor–Acceptor′ Small‐Molecule Donors on the Open Circuit Voltage of Organic Photovoltaics
Author(s) -
Che Xiaozhou,
Chung ChinLung,
Liu Xiao,
Chou ShuHua,
Liu YiHung,
Wong KenTsung,
Forrest Stephen R.
Publication year - 2016
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201601957
Subject(s) - malononitrile , open circuit voltage , acceptor , methylene , molecule , organic solar cell , materials science , photochemistry , voltage , chemistry , medicinal chemistry , catalysis , organic chemistry , electrical engineering , physics , polymer , condensed matter physics , composite material , engineering
Donor–acceptor–acceptor′ small‐molecule donors are synthesized to investigate regioisomeric effects on organic photovoltaic device performance. Cross‐conjugation in 2‐((7‐( N ‐(2‐ethylhexyl)‐benzothieno[3,2‐ b ]thieno[3,2‐ d ]pyrrol‐2‐yl)benzo[ c ][1,2,5]thiadiazol‐4‐yl)methylene)malononitrile leads to an increased open‐circuit voltage compared with its isomer 2‐((7‐( N ‐(2‐ethylhexyl)‐benzothieno[3,2‐ b ]thieno[2,3‐ d ]pyrrol‐2‐yl)benzo[ c ][1,2,5]thiadiazol‐4‐yl)methylene)malononitrile. A correlation is then established between molecular conjugation length and orbital energies, and hence open‐circuit voltage.