Citation: Sun Yanna, Gao Huanhuan, Zhang Yamin, Wang Yunchuang, Kan Bin, Wan Xiangjian, Zhang Hongtao, Chen Yongsheng. An Efficient Ternary Organic Solar Cell with a Porphyrin Based Small Molecule Donor and Two Fullerene Acceptors[J]. Chinese Journal of Organic Chemistry, ;2018, 38(1): 228-236. doi: 10.6023/cjoc201706026 shu

An Efficient Ternary Organic Solar Cell with a Porphyrin Based Small Molecule Donor and Two Fullerene Acceptors

State Key Laboratory of Elemento-Organic Chemistry, Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, College of Chemistry, Nankai University, Tianjin 300071

Corresponding author: Chen Yongsheng, yschen99@nankai.edu.cn
Received Date: 19 June 2017
Revised Date: 19 July 2017
Available Online: 30 January 2017
Fund Project: the Naional Natrual Science Foundation of China 51373078the Naional Natrual Science Foundation of China 91433101Project supported by the Ministry of Science and Technology (No. 2014CB643502), the Naional Natrual Science Foundation of China (Nos. 51373078, 51422304, 91433101) and the Natrual Science Foundation of Tianjin City (No. 17JCZDJC31100)the Naional Natrual Science Foundation of China 51422304the Ministry of Science and Technology 2014CB643502the Natrual Science Foundation of Tianjin City 17JCZDJC31100

Figures(5)

Recently, ternary organic solar cells have emerged as a promising strategy to achieve both high performance and fabrication simplicity for organic solar cells. It has been proved that this strategy is an effective way to achieve improved short-circuit current density (J_sc) with complementary absorption or to get enhanced open-circuit voltage (V_oc) through forming energy level cascade. In this work, we designed and synthesized a thieno[3, 2-b]thiphene-substituted porphyrin molecule flanked with two diketopyrrolopyrrole units by ethynylene bridges, named DEP-TT, which exhibited a very low energy bandgap of 1.31 eV and a broad light absorption to 898 nm. The power conversion efficiency (PCE) of binary devices based on DEP-TT and the acceptor [6, 6]-phenyl-C71-butyric-acid-methyl-ester (PC₇₁BM) achieved 7.46% with a relatively low V_oc of 0.75 V. Futhermore, the ternary solar cells with 10% indene-C60 bis-adduct (ICBA) achieved high PCE of 8.15%, with higher V_oc, J_sc and a relatively higher PCE based on organic solar cells with a porphyrin-small molecule as the donor. This improved performance is believed to be due to the energy level cascade and synergistic effects of the two acceptors of PCBM and ICBA, which suggestes that the ternary bulk heterojunction (BHJ) strategy is a promising way to improve both V_oc and J_sc simultaneously and thus overall performance for the same donor material.
- porphyrin small molecule donor,
- two fullerene acceptors,
- ternary organic solar cell
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