Publication date: 11th March 2026
Recent progresses on the perovskite solar cells at UCLA
Yang Yang1,2
Department of Materials Science and Engineering, UCLA
MoleculaX Inc., Pasadena, CA 91107, USA
Perovskite solar cells (PSCs) have become one of the most transformative photovoltaic technologies. In this presentation, I like to share some recent progresses at UCLA on interface engineering, PVSK crystal growth, and eventually, using the latest AI technology to create a database, the PervoskiteNet, and a LLM to guide the PSC device research.
Interface Engineering: For the NIP device, the buried SnO2/perovskite interface is a critical yet elusive origin of instability in perovskite solar cells, where light absorption and photo-induced degradation are concentrated. We demonstrate that interfacial instability drives structural and chemical decomposition of the perovskite layer via tin-ion migration. Introducing polymeric interlayers strengthens interfacial bonding and suppresses tin diffusion. These results demonstrated the buried interface as a primary degradation source and underscore interfacial polymer design as an effective route to intrinsically stable perovskite photovoltaics.
Defect management via bulk crystal growth: In parallel to our interface engineering is our intension to manage the defect formation during PVSK crystallization. Conventional intermediate phases form before perovskite nucleation and cannot heal growth-induced defects. Here, we identify a thermally activated intermediate phase emerging after perovskite formation. A sterically hindered additive enables high-temperature re-alloying with pre-formed perovskite nuclei, inducing in-situ lattice reconstruction and defect elimination. Devices achieve 26.82% efficiency and retain 90% performance after 1,300 h at 65 °C.
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