Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.502
Publication date: 18th December 2023
Perovskite solar cells (PSCs) with an inverted (or refer as p-i-n) structure are attractive for future commercialization owing to their unique properties such as easy scalable fabrication, reliable operation, and compatibility with a wide range of perovskite based tandem and multijunction configurations, presenting one of the most promising photovoltaics. Here, three works related to inverted PSCs efficiency and stability will be presented: (1) By introducing a small molecule of 3-APy (3-(aminomethyl)pyridine) to selectively react with perovskite surface formamidinium ions, the perovskite/electron transport layer interface was multifunctionally optimized with reduced perovskite surface roughness and potential fluctuations, and resulting to an effective n-type doping surface region, achieve the PCE beyond 25% with excellent stability; (2) Based on the first work, through the optical and electrical modeling to design a transparent conducting rear electrode, enabled an efficient bifacial PSCs with bifaciality of 91-93%. When under the concurrent bifacial measurement conditions, we obtained equivalent, stabilized bifacial power output densities of 26.9, 28.5 and 30.1 mW/cm2 under albedos of 0.2, 0.3 and 0.5, respectively; (3) Through a series of indoor stability testing for the efficient and well-packaged inverted PSCs, we found indoor accelerated stability test can predict our six-month outdoor ageing tests. Devices degradation rate under illumination and at elevated temperatures are most instructive for understanding outdoor device reliability. Meanwhile, we found indium tin oxide/self-assembled monolayer/perovskite interface most strongly affects our device operational stability. After optimization, an increased averaged device operational stability at 50℃-85℃ by 2.8 times was achieved, reaching over 1000 h at 85℃ and near to 8200 h at 50℃, with a projected 20% degradation. After 22 weeks of outdoor aging in Denver area, the devices keep 90% of original efficiencies.
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