Citation: He Anwang, Qin Yuancheng, Dai Weili, Zhou Dan, Zou Jianping. Effective design of A-D-A small molecules for high performance organic solar cells via F atom substitution and thiophene bridge[J]. Chinese Chemical Letters, ;2019, 30(12): 2263-2265. doi: 10.1016/j.cclet.2019.07.018 shu

Effective design of A-D-A small molecules for high performance organic solar cells via F atom substitution and thiophene bridge

Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China

qinyuancheng@hotmail.com

Received Date: 20 May 2019
Revised Date: 15 June 2019
Accepted Date: 5 July 2019
Available Online: 5 December 2019

Figures(4)

Three novel small molecules with acceptor-donor-acceptor (A-D-A) configuration, SBDT1, SBDT2 and SBDT3, where 4, 8-bis(octyloxy)benzo[1, 2-b:4, 5-b']dithiophene (BDT) as the electron-donating core connecting to thiophene-substituted benzothiadiazole (BT) as electron-withdrawing are reported. The effects of fluorine atoms on the photophysical properties by introducing different fluorine atoms into the benzothiadiazole unit were investigated. These SBDTs exhibit good thermal stability, excellent panchromatic absorption in solution and film. SBDT2 and SBDT3 with fluorine-substituted BT possess a relatively deeper the highest occupied molecular orbital (HOMO). These A-D-A type molecules were treated as donor and PC₇₁BM as acceptor in bulk heterojunction (BHJ) small-molecule organic solar cells (SMOSCs). Among them, device based on SBDT2 gave the best device performance with a PCE of 5.06% with J_sc of 10.56 mA/cm², V_oc of 0.85 V, fill factor (FF) of 56.4%. These studies indicate that proper incorporation of fluorine atoms is an effective way to increase the efficiency of organic solar cells.
- A-D-A small molecule,
- Benzothiadiazole,
- Fluorination,
- Organic solar cells
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沈阳化工大学材料科学与工程学院沈阳 110142