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Benzothieno[3,2-b]thiophene-Based Noncovalent Conformational Lock Achieves Perovskite Solar Cells with Efficiency
Heng Zhang1, Xin Yu2, Mengjia Li3
1Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Institution, Department of Applied Chemistry, Tianjin University of Technology, Tianjin, 300384, China.
Angewandte Chemie (International Ed. in English)
|November 16, 2023
Summary
New organic semiconductors with noncovalently conformational locks (OSNCs) improve hole-transporting materials (HTMs) for perovskite solar cells (PSCs). This leads to higher efficiency and enhanced device stability.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic semiconductors with noncovalently conformational locks (OSNCs) are key for hole-transporting materials (HTMs).
- Existing OSNCs face limitations due to inadequate neighboring building blocks, impacting optoelectronic properties and perovskite solar cell (PSC) stability.
Purpose of the Study:
- To engineer novel OSNCs by introducing benzothieno[3,2-b]thiophene (BTT).
- To enhance the performance and stability of PSCs using the newly developed HTM.
Main Methods:
- Synthesized a new OSNC incorporating BTT, named ZS13.
- Fabricated and tested PSC devices utilizing ZS13 as the HTM.
- Evaluated optoelectronic properties, energy levels, surface passivation, thermal stability, and ion migration inhibition.
Main Results:
- The ZS13 HTM demonstrated improved intermolecular charge extraction and transport.
- Achieved champion PSC efficiencies of 24.39% (0.1 cm²) and 20.95% (1.01 cm²).
- ZS13 exhibited excellent thermal stability and effectively inhibited iodide ion migration, enhancing device longevity.
Conclusions:
- Neighboring-group engineering in OSNCs is a viable strategy for high-performance HTMs.
- The BTT-based OSNC, ZS13, offers a promising pathway for developing efficient and stable PSCs.
- This work encourages further development of thienoacene-based OSNCs for advanced photovoltaic applications.
