Self-AssembledMonolayer Materials with Multifunctionfor Antimony Selenosulfide Solar Cells

Two organic molecules, TPA-2Th and TPA-2Py, are developed and serve as self-assembled monolayers (SAMs) for Sb₂(S,Se)₃ (antimony selenosulfide) solar cells. The solid interface interaction between SAMs and Sb₂(S,Se)₃ accomplishes suppressed surface defects, uniform surface potential, suitable interfacial band-bending alignment, efficient charge transfer, and improved photoelectric properties. The optimized solar cells with SAMs show increased power conversion efficiencies (PCEs). For TPA-2Th, the champion PCE is inspiringly enhanced by >10% to 8.21%. This is the first time novel SAMs have been developed specifically for Sb₂(S,Se)₃ solar cells, and this will bring fresh strategies for improving Sb-based solar cells.