A solution-processed high performance organic solar cell using a small molecule with the thieno[3,2-b]thiophene
Qian Zhang1, Yunchuang Wang, Bin Kan
1State Key Laboratory and Institute of Elemento-Organic Chemistry and Centre for Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China. xjwan@nankai.edu.cn yschen99@nankai.edu.cn.
A new organic solar cell material, DRCN8TT, was synthesized and achieved an 8.11% power conversion efficiency (PCE). This improvement is attributed to its optimized morphology, enhancing performance over similar materials.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic solar cells (OSCs) offer a promising alternative to conventional photovoltaics due to their flexibility and low-cost fabrication.
- Developing efficient small molecule semiconductors is crucial for advancing OSC performance.
Purpose of the Study:
- To design and synthesize a novel acceptor-donor-acceptor (A-D-A) small molecule, DRCN8TT, for solution-processed organic solar cells.
- To investigate the structure-property relationships influencing the performance of DRCN8TT.
Main Methods:
- Synthesis of the DRCN8TT small molecule using thieno[3,2-b]thiophene as the central unit and 2-(1,1-dicyanomethylene)-rhodanine as the terminal unit.
- Fabrication and characterization of organic solar cell devices incorporating DRCN8TT.
- Morphological analysis to understand the relationship between film structure and device performance.
Main Results:
- The synthesized DRCN8TT achieved an optimized power conversion efficiency (PCE) of 8.11%.
- DRCN8TT demonstrated significantly higher PCE compared to its analogue molecule, DRCN8T.
- Morphological studies revealed small, highly crystalline domains in the DRCN8TT films, commensurate with exciton diffusion length.
Conclusions:
- The designed A-D-A small molecule DRCN8TT shows excellent potential for high-performance organic solar cells.
- Optimized molecular design and resulting film morphology are key factors for enhancing PCE in solution-processed OSCs.
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