Researchers from the University of North Carolina at Chapel Hill and Hong Kong Polytechnic University have addressed the challenges hindering the reception of wide-bandgap (WBG) perovskite solar cells, which are expected to play a key role in next-generation multi-junction solar cells but suffer from large photovoltage loss, poor stability and scalable fabrication in ambient air.
The team incorporated a reductive methylhydrazinium cation into WBG perovskites, which not only reduced defect density but also suppressed iodide oxidation and halide demixing, enabling scalable fabrication of efficient and stable WBG solar cells and modules in ambient air.
Remarkably, the champion WBG perovskite solar cells achieved a power conversion efficiency (PCE) of 23.3% with an open-circuit voltage of 1.28 V, corresponding to a record low voltage loss of 0.37 V.
The WBG mini modules delivered a stabilized PCE of 19.8% with an aperture area of 25 cm2.
The mini modules can keep 94% of the initial PCE after 700 hours of operation under continuous light soaking at 1-sun illumination at 55 ± 5 °C.
This work suggests a viable route to the sustainable harvesting of solar energy.
