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Universal Sacrificial Coordination Strategy for ALD-Resilient SAMs Achieving High-Performance Perovskite/Organic
Jixiang Yuan1, Denghui Ma2, Weijie Chen1
1Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and Devices, State Key Laboratory of Bioinspired Interfacial Materials Science, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China.
Researchers developed a sacrificial coordination strategy using HTFNA to prevent detrimental reactions during atomic layer deposition in perovskite/organic tandem solar cells. This enhances device efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Device Physics
Background:
- Perovskite/organic tandem solar cells (TSCs) aim to exceed the Shockley-Queisser limit for improved solar energy conversion.
- Self-assembled monolayers (SAMs) are crucial hole extraction layers in TSCs, but are vulnerable to damage during atomic layer deposition (ALD).
- ALD is used to create dense oxide layers on SAMs, yet precursor reactions often cause SAM desorption and current leakage.
Purpose of the Study:
- To address the issue of SAM desorption and current leakage caused by ALD precursor reactions in TSCs.
- To develop a universal strategy for protecting SAMs during ALD processes.
- To enhance the interfacial properties and performance of perovskite/organic TSCs.
Main Methods:
- Introduced a sacrificial coordination (SC) strategy using 6-hydroxy-4-(trifluoromethyl)nicotinic acid (HTFNA) within SAM precursors.
- HTFNA acts as a multifunctional additive to suppress SAM aggregation, shield SAMs from ALD precursors, and improve work function.
- Evaluated the strategy's broad applicability in various SAM-based devices, focusing on perovskite/organic TSCs.
Main Results:
- Achieved a champion perovskite/organic TSC efficiency of 27.03% (certified 26.56%).
- Demonstrated significantly enhanced SAM/perovskite heterointerface adhesion.
- Reported superior operational stability (T90 of 1265 h) and ambient storage performance (T90 of 2037 h).
Conclusions:
- The sacrificial coordination strategy effectively protects SAMs during ALD, resolving a critical challenge in TSC fabrication.
- This method broadens the applicability of ALD for enhanced interfacial engineering in solar cells.
- The improved device efficiency, stability, and adhesion highlight the potential of this universal strategy for advanced photovoltaic devices.
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