Technological watch

Realizing photoactive and thermodynamically stable all?inorganic perovskite solar cells remains a challenging task within halide perovskite photovoltaic research.[11] Here, we report a dual strategy for realizing efficient inorganic mixed halide perovskite photovoltaic devices based on a terbium doped solar absorber, i.e., CsPb1?xTbxI2Br, which undertakes a bulk and surface passivation treatment in the form of CsPb1?xTbxI2Br quantum dots (QDs), to maintain a photoactive ??phase under ambient conditions and with significantly improved operational stability. Devices fabricated from our air?processed perovskite thin films exhibit an air?stable power conversion efficiency (PCE) that reaches 17.51% (small area devices) with negligible hysteresis and maintains >90% of the initial efficiency when operating for 600 hours under harsh environmental conditions, stemming from the combined effects of the dual?protection strategy. Our approach is further examined within large?area perovskite solar cell modules (19.8 cm2 active area) to realize 10.94% PCE and >30 days ambient stability, as well as within low?band gap ??CsPb0.95Tb0.05I2.5Br0.5 (Eg = 1.73 eV) materials, yielding 19.01% (18.43% certified) PCE.This article is protected by copyright. All rights reserved