Synthesis and Characterization of Wide-Bandgap Conjugated Polymers Consisting of Same Electron Donor and Different Electron-Deficient Units and Their Application for Nonfullerene Polymer Solar Cells

Keshtov, M.L.; Kuklin, S.A.; Konstantinov, I.O.; Khokhlov, A.R.; Dou, C.; Sharma, G.D.

Авторы: Keshtov Mukhamed L., Kuklin Serge A., Konstantinov Igor O., Khokhlov Alexei R., Dou Chuandong, Sharma Ganesh D.
Журнал: Macromolecular Chemistry and Physics
Том: 221
Номер: 10
Год издания: 2020
Издательство: John Wiley & Sons Ltd.
Местоположение издательства: United Kingdom
Первая страница: 2000030
DOI: 10.1002/macp.202000030
Аннотация: Substantial development has been made in nonfullerene small molecule acceptors (NFSMAs) that has resulted in a signiﬁcant increase in the power conversion eciency (PCE) of nonfullerene-based polymer solar cells (PSCs). In order to achieve better compatibility with narrow-bandgap nonfullerene small molecule acceptors, it is important to design the conjugated polymers with a wide bandgap that has suitable molecular orbital energy levels. Here two donor–acceptor (D–A)-conjugated copolymers are designed and synthesized with the same thienyl-substituted benzodithiophene and dierent acceptors, i.e., poly{(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-(1,3-bis(2-octyldodecyl)-1,3-dihydro-2H-dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2-d]imidazol-2-one-5,8-diyl)} (DTBIA, P1) and poly{(4,8-bis(5-(2-ethyl-hexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-(2-(5-(3-octyltr-idecyl)thiophen-2-yl)dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2-d]thiazole-5,8-diyl)} (TDTBTA, P2) (and their optical and electrochemical properties are investi-gated). Both P1 and P2 exhibit similar deeper highest occupied molecular orbital energy level and dierent lowest unoccupied molecular orbital energy level. Both the copolymers have complementary absorption with a well-known nonfullerene acceptor ITIC-F. When blended with a narrow-bandgap acceptor ITIC-F, the PSCs based on P1 show a power conversion eciency of 11.18% with a large open-circuit voltage of 0.96V, a Jsc of 16.89mA cm−2, and a ﬁll factor (FF) of 0.69, which is larger than that for P2 counterpart (PCE = 9.32%, Jsc= 15.88mA cm−2, Voc= 0.91V, and FF = 0.645). Moreover, the energy losses for the PSCs based on P1 and P2 are 0.54 and 0.59eV, respectively. Compared to P2, the P1-based PSCs show high values of incident photon to current con-version eciency (IPCE) in the shorter-wavelength region (absorption of donor copolymer), more balanced hole and electron mobilities, and favorable phase separation with compact π–π stacking distance
Добавил в систему: Куклин Сергей Александрович

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Synthesis and Characterization of Wide-Bandgap Conjugated Polymers Consisting of Same Electron Donor and Different Electron-Deficient Units and Their Application for Nonfullerene Polymer Solar Cellsстатья

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