Development, Stability Aspects of Encapsulants based on Thermoplastic Polyurethanes for Perovskite Solar Cells
Rohith Kumar Raman a, Ananthanarayanan Krishnamoorthy a
a SRM Institute of Science and Technology, Mahatma Gandhi Road, Kattankulathur, India
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Poster, Rohith Kumar Raman, 064
Publication date: 18th October 2023

The rapid development of Hybrid organic-inorganic metal halide perovskite solar cell (PSC) technology is attributed to its simple solution chemistry, high power conversion efficiency (PCE), and potential for cost-effective mass production. However, the scalability and outdoor deployment of PSCs face a critical challenge stemming from the intrinsic instability of perovskite materials in the presence of oxygen and moisture. The long-term reliability of these devices requires appropriate encapsulation to prevent degradation caused by environmental factors.[1] In this work, a low-cost, easily laminated and a library of polyurethanes is synthesized and evaluated for PSCs encapsulation. The polyurethane encapsulation layer shows good protection performance due to improved hydrophobicity and increased resistance of the O2 or H2O diffusion. The encapsulant shows no degradation in extreme conditions like -100 ⁰C and 100 ⁰C. The developed TPUs exhibited robustness, excellent adhesion to glass substrates, and crucially, the low-temperature encapsulation process prevented degradation of the perovskite absorber and other organic layers within the device structure. Encapsulated devices maintained over 93% of their initial power conversion efficiency (PCE) even after exposure to harsh environmental conditions, including high relative humidity (80±5% RH) for more than 1000 hours. Additionally, the encapsulated perovskite absorbers demonstrated remarkable stability when submerged in water.[2] This research underscores the potential of thermoplastic polyurethane as an easily scalable encapsulant for PSCs, opening new avenues for prolonging their operational lifetime and advancing towards commercialization.

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