Abstract
Mechanical failure and chemical degradation of device heterointerfaces can strongly influence the long-term stability of perovskite solar cells (PSCs) under thermal cycling and damp heat conditions. We report chirality-mediated interfaces based on R-/S-methylbenzyl-ammonium between the perovskite absorber and electron-transport layer to create an elastic yet strong heterointerface with increased mechanical reliability. This interface harnesses enantiomer-controlled entropy to enhance tolerance to thermal cycling-induced fatigue and material degradation, and a heterochiral arrangement of organic cations leads to closer packing of benzene rings, which enhances chemical stability and charge transfer. The encapsulated PSCs showed retentions of 92% of power-conversion efficiency under a thermal cycling test (-40 degrees C to 85 degrees C; 200 cycles over 1200 hours) and 92% under a damp heat test (85% relative humidity; 85 degrees C; 600 hours).
Original language | American English |
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Pages (from-to) | 878-884 |
Number of pages | 7 |
Journal | Science |
Volume | 384 |
Issue number | 6698 |
DOIs | |
State | Published - 2024 |
NREL Publication Number
- NREL/JA-5900-90016
Keywords
- chiral
- perovskite
- solar cells
- stability