Vacuum-processed CsPbBr3 thin films as absorber layer in perovskite solar cells

Transitioning to all-inorganic cesium perovskites is an alternative route to tackle the long-term stability challenges in perovskite solar cells (PSCs). CsPbBr3 perovskites offer robust stability and do not suffer from polymorphism relative to its counterpart, CsPbI3. With a Shockley-Queisser single-junction limit of ~ 16 % and a wide bandgap of ~ 2.3 eV, it is attractive for semi-transparent, building-integrated photovoltaics and multijunction applications. Here, an all-vacuum-processed all-inorganic PSC is demonstrated to achieve a phase-pure, compact film of the desired thickness, paving the way for exploring the CsPbBr3 active layer in other optoelectronic devices such as LEDs.