Yes, there are several polymers besides SAN that can improve the thermal stability of perovskite solar cells. Here are a few examples:
- Conjugated Polymers: Research has shown that conjugated polymers such as those based on 1,4-bis(2-thienyl)phenylene (TPT) linked with thiophene-based comonomers can enhance thermal stability. Specifically, TPT-T (MB/C6), which features branched and linear side chains, has been identified as a promising hole transport layer (HTL) that improves stability at elevated temperatures compared to traditional materials like spiro-OMeTAD.
- Polyimide: Another polymer that has demonstrated potential in enhancing thermal stability is polyimide. When used on top of perovskite solar cells, polyimide has shown the ability to stabilize the cells even after prolonged exposure to high temperatures, such as 85 °C for more than a month.
- Thermoplastic Polymers: Thermoplastic polymer additives have also been proposed as a strategy to improve thermal stability. These polymers can contribute to a more stable crystal structure, reducing degradation under thermal stress.
- Multifunctional Polymers: Polymers with multifunctional groups offer superior thermal stability and can enhance film crystallization, reducing defect density in perovskite layers. These polymers can inhibit ion migration and strengthen the barrier against phase separation, thereby enhancing both photo and thermal stability.
These examples highlight the versatility of polymers in addressing the thermal stability challenges faced by perovskite solar cells.
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