Improving the stability of perovskite-silicon tandem solar cells is crucial for their widespread adoption. Here are several strategies that can enhance their stability:
Strategies to Improve Stability
- Interfacial Engineering:
- Magnesium Fluoride (MgFx) Interlayer: Adding an ultrathin MgFx interlayer between the perovskite and electron transport layer (like C60) can mitigate nonradiative recombination by adjusting the surface energy of the perovskite layer. This method has been shown to maintain about 95% of the initial performance after prolonged exposure to damp-heat conditions.
- Carboranes in Perovskites: Incorporating carboranes (e.g., ortho-carborane) into perovskites can enhance thermal conductivity and reduce interfacial recombination. This approach improves the stability by preventing degradation at high temperatures.
- Optimized Perovskite Composition:
- Cationic and Anionic Diversity: Using perovskites with triple cation (e.g., Cs+, FA+, Pb2+) and triple halide (I−, Br−, Cl−) configurations can improve stability and efficiency. Additives like (Br3)− and SCN− help reduce trap states and segregation.
- Hole Transport Layers (HTLs):
- Self-Assembled Monolayers: Employing self-assembled monolayers in HTLs, such as Me-4PACz, can enhance performance. Combining these with other molecules can improve wetting and coverage on substrates.
- Thermal Regulation:
- Developing strategies to regulate heat can significantly improve stability, especially in all-perovskite tandem cells. Incorporating materials with good thermal conductivity helps manage heat-related degradation.
Conclusion
These strategies collectively aim to reduce recombination losses, enhance thermal stability, and maintain device efficiency over time, making perovskite-silicon tandem solar cells more reliable for practical applications.
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