Light-induced performance increase of carbon-based perovskite solar module for 20-year stability
Eiji Kobayashi, Ryuki Tsuji, David Martineau, Andreas Hinsch, Seigo Ito
Abstract
Improving stability has become one of the most important objectives in the practical application of perovskite photovoltaics. Here, we develop encapsulated mesoporous-carbon perovskite solar mini-modules that retain more than 92% of their initial performance after 3,000 h of damp-heat aging at 85°C/85% relative humidity, while maintaining 90% of the initial value (T90) for 3,260 h, equivalent to 20-year stability in outdoor use. This stability is attributed to the light-induced performance increase phenomenon. The mechanism is associated with the organic molecules 5-ammoniumvaleric acid and methylammonium forming a quasi-2-dimensional perovskite/metal oxide interface with a positive effect on charge transport and ion migration. This work extends our present understanding of the mechanism underlying the light-induced performance and stability increase.