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A Two-Dimensional Hole-Transporting Material for High-Performance Perovskite Solar Cells with 20 % Average
Qian-Qing Ge1,2, Jiang-Yang Shao1, Jie Ding1,2
1Beijing National Research Centre for Molecular Sciences, CAS Research/Education Centre for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Angewandte Chemie (International Ed. in English)
|June 29, 2018
Summary
A novel, cost-effective hole-transporting material (HTM), OMe-TATPyr, was developed for perovskite solar cells (PSCs). This HTM achieved high power conversion efficiencies (PCEs) up to 20.6%, demonstrating its potential for efficient solar energy conversion.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) are a promising photovoltaic technology.
- Efficient hole-transporting materials (HTMs) are crucial for PSC performance and stability.
- Developing low-cost, high-performance HTMs is essential for commercialization.
Purpose of the Study:
- To synthesize and characterize a novel, readily available small molecular HTM, OMe-TATPyr.
- To evaluate the performance of OMe-TATPyr in mixed-cation perovskite solar cells.
- To investigate the structure-property relationships and charge transport mechanisms of OMe-TATPyr.
Main Methods:
- Synthesis of OMe-TATPyr, a 2D π-conjugated molecule with a pyrene core and triarylamine groups.
- Fabrication and testing of PSCs incorporating OMe-TATPyr as the HTM.
- Characterization using depth-profiling XPS, photoluminescence, and electrochemical impedance analysis.
Main Results:
- OMe-TATPyr was synthesized cost-effectively (around $50 g⁻¹).
- PSCs with OMe-TATPyr achieved a champion PCE of 20.6% and an average PCE of 20.0% (0.09 cm²).
- Larger area devices (1.08 cm²) showed a PCE of 17.3%, indicating scalability.
Conclusions:
- OMe-TATPyr is a highly effective HTM for PSCs, offering improved charge transport and potential trap passivation.
- The material's low cost and high performance make it a viable candidate for commercial PSC applications.
- Further research can explore OMe-TATPyr in various PSC architectures for enhanced stability and efficiency.
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