Publication date: 17th February 2025
C60-self-assemble monolayers (C60-SAMs) are one of the few materials used as electron transport layers in n-i-p devices, that can substantially reduce the presence of hysteresis. C60-SAM provides efficient electron extraction and higher mobility compared to metal oxides such as SnO2 and TiO2; the common electron transport layers (ETLs) applied in n-i-p photovoltaic devices. It can be deposited at low temperatures, making it compatible with flexible devices [1]. In this work, we demonstrate an efficient planar n-i-p perovskite solar cell with 18% power conversion efficiency, by simply depositing C60-SAM directly on the conductive substrate at low temperature. Apart from the higher power conversion efficiency, the cells present a high fill factor value, reaching 80%. The encapsulated cells retain approximately 90% of their initial power conversion efficiency after ~ 6000 hours under artificial illumination, demonstrating an impressive lifetime. This work represents a significant step toward the development of efficient and stable flexible perovskite solar devices for commercial applications.
We acknowledge the support of Nano-C and UNESP.
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