UNSW Sydney studied 2D films to improve perovskite solar cell efficiency

Researchers from the School of Photovoltaic and Renewable Energy Engineering at the University of New South Wales examined 2D alkylammonium bromide films for perovskite solar cells (PSCs). They adjusted the carbon chain length in these films to improve device performance. The best-performing cell, with n-hexylammonium bromide film, achieved a power conversion efficiency (PCE) of 21.4%, a 12.6% improvement over the control device. All 2D films improved open-circuit voltages, fill factors, and stability. Surface analysis revealed smoother surfaces and larger grains, while depth profiling indicated lower ion migration, reducing long-term hysteresis. The findings showed that optimized 2D films could improve PSCs’ performance with minimal additional cost and processing time.