Boosting Thermal Stability of Perovskite Solar Cells by Introducing Metal Oxide Nanoparticle
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초록
내용
Perovskite solar cells (PSCs) are promising solar cell due to high absorption coefficient, long diffusion length, adjustable bandgap. Among them, tin oxide-based planar PSCs are attracting attention because of hysteresis-free and low temperature process and high efficiency over 21%. However, long term stability is still issue to commercialize the PSCs. Poor stability is due to degradation of perovskite with high temperature and low glass transition temperature of doped spiro-OMeTAD. To solve these problems, we introduced new approach involving metal oxide nanoparticle which is infiltrated to hole transporting layer (HTL). Introducing metal oxide makes possible maintain the long term stability by removing the heat in PSCs regardless of the types of HTL. As a results, our device retained 91% of initial efficiency after 31 days at 85℃ and 85% relative humidity after over the 700 hours without encapsulation. This research reports the importance of heat dissipation for the first time and achieves few hundred hours thermal stability in real operating conditions.