“Bimolecularly passivated interface enables efficient and stable inverted perovskite solar cells” (2023), by Cheng Liu et al. Engineering research paper. Original abstract below, unchanged. A free PDF is available.

Bimolecularly passivated interface enables efficient and stable inverted perovskite solar cells

Cheng Liu, Yi Yang, Hao Chen et al. · November 16, 2023 · Engineering

Abstract

Compared with the n-i-p structure, inverted (p-i-n) perovskite solar cells (PSCs) promise increased operating stability, but these photovoltaic cells often exhibit lower power conversion efficiencies (PCEs) because of nonradiative recombination losses, particularly at the perovskite/C 60 interface. We passivated surface defects and enabled reflection of minority carriers from the interface into the bulk using two types of functional molecules. We used sulfur-modified methylthio molecules to passivate surface defects and suppress recombination through strong coordination and hydrogen bonding, along with diammonium molecules to repel minority carriers and reduce contact-induced interface recombination achieved through field-effect passivation. This approach led to a fivefold longer carrier lifetime and one-third the photoluminescence quantum yield loss and enabled a certified quasi-steady-state PCE of 25.1% for inverted PSCs with stable operation at 65°C for >2000 hours in ambient air. We also fabricated monolithic all-perovskite tandem solar cells with 28.1% PCE.

Free PDF DOI: 10.1126/science.adk1633