Citation: Li Xiaofang, Li Kun, Su Dan, Shen Fugang, Huo Shuying, Fu Hongbing, Zhan Chuanlang. Design a thieno[3, 2-b]thiophene bridged nonfullerene acceptor to increase open-circuit voltage, short-circuit current-density and fill factor via the ternary strategy[J]. Chinese Chemical Letters, ;2020, 31(5): 1243-1247. doi: 10.1016/j.cclet.2019.10.029 shu

Design a thieno[3, 2-b]thiophene bridged nonfullerene acceptor to increase open-circuit voltage, short-circuit current-density and fill factor via the ternary strategy

Li Xiaofang ^{a,b, 1} ,
Li Kun ^{b,c, 1} ,
Su Dan ^a,b ,
Shen Fugang ^a,b,*, ,
Huo Shuying ^a,*, ,
Fu Hongbing ^c ,
Zhan Chuanlang ^a,b,*,

a.
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
b.
CAS key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
c.
Department of Chemistry, Capital Normal University, Beijing 100048, China

shenfg@hbu.edu.cn

shuyinghuo@hbu.edu.cn

clzhan@iccas.ac.cn

Received Date: 5 September 2019
Revised Date: 15 October 2019
Accepted Date: 24 October 2019
Available Online: 30 October 2019

Figures(4)

In this study, we report a new small molecule acceptor (named TT-4F) which uses 3, 6-dimethoxylthieno[3, 2-b]thiophene (TT) as the π-bridge. Addition of 0.05 weight ratio amount of TT-4F into the host binary blend of PTB7-Th:IEICO-4F, resulting in a ternary blend in a weight ratio of 1:1:0.05, enables increased open-circuit voltage (V_oc), short-circuit current-density (J_sc), and fill-factor (FF) at the same time. Finally, 12.1% efficiency is obtained. Compared to the 3-(2-ethylhexyloxylthiophene) bridge on IEICO-4F, the additional methoxyl group on the TT-6 position is involved in the lowest unoccupied molecular orbital (LUMO) and the larger π-system on TT increases the electron-donating nature, both of which help to raise the LUMO level, one reason of the increased V_oc. Upon addition of 0.05 TT-4F, the hole mobility is increased, the monomolecular recombination is reduced, and the charge dissociation and collection is enhanced. All of these contribute to the increased J_sc and FF.
- Fullerene-free,
- Polymer solar cell,
- Small molecule acceptor,
- Ternary solar cell,
- Organic photovoltaic
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