Over 31%-Efficient Perovskite-TOPCon Solar Cells Enabled by AlOx-based Hydrogenation and Front Sub-micron Texturing

Abstract

We demonstrate high-efficiency perovskite–silicon tandem solar cells using double-sided tunnel oxide passivated contacts (TOPCon²) bottom cells, achieving 30.2% efficiency on both-sides flat and 31.3% on front-textured devices. The former is enabled by high passivation quality on flat surfaces and the latter by enhanced optical performance. These results highlight that TOPCon² is a promising platform for scalable tandem integration beyond silicon heterojunction-based bottom cells.