Work

Impact of Ultrathin Electron-Selective Contacts on Perovskite–Silicon Tandem Solar Cells

Year: 2026

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide During the development of perovskite–silicon tandem solar cells, the impact of transport layers of perovskite top cells on the short-circuit current density ( J SC ) has rarely been considered. Here, we report ultrathin electron-selective contacts as new architectures of electron transport layers (ETLs) by decreasing the C 60 thickness to 1 nm, where the carrier collection efficiency is proven to be independent of C 60 thickness with tin oxide as a buffer layer. Benefiting from the lowest C 60 parasitic absorption, the J SC in the tandem device with ultrathin C 60 is enhanced by 0.24 mA/cm 2 . Moreover, to recover the damage from atomic layer deposition on uncovered perovskite surface, we use poly(methyl methacrylate) (PMMA) as a protective layer. Combining ultrathin C 60 and PMMA protective layer, an efficiency of 31.70% is finally achieved in tandem solar cells. These findings demonstrate the feasibility of ultrathin ETLs or ETL-free designs for perovskite–silicon tandem solar cells.

Source: ACS Energy Letters

DOI: 10.1021/acsenergylett.5c04082