Abstract
The heating and cooling phase diagram of CsPb(BrxI1−x)3 is determined by combinatorial synthesis and high throughput X-ray characterization.
Highlights
In recent years, hybrid perovskites (ABX3) have proven to be an excellent absorber material for photovoltaic applications and are currently the best performing thin- lm materials with power conversion efficiencies above 25%.1 Many of these perovskite materials can be processed from solution by spin-coating, slot-dye coating,[2] or inkjet printing[3] at moderate processing temperatures
We find that all compositions convert to the cubic perovskite phase at high temperature and that the presence of bromide in the films stabilizes the metastable perovskite phases upon cool down
This implies that the mixture is a solid solution and explains the tunability in optical properties previously reported.[25,26]
Summary
Hybrid perovskites (ABX3) have proven to be an excellent absorber material for photovoltaic applications and are currently the best performing thin- lm materials with power conversion efficiencies above 25%.1 Many of these perovskite materials can be processed from solution by spin-coating, slot-dye coating,[2] or inkjet printing[3] at moderate processing temperatures. Hybrid perovskites (ABX3) have proven to be an excellent absorber material for photovoltaic applications and are currently the best performing thin- lm materials with power conversion efficiencies above 25%.1. Many of these perovskite materials can be processed from solution by spin-coating, slot-dye coating,[2] or inkjet printing[3] at moderate processing temperatures. The limited thermal stability of halide hybrid perovskites is in part due to the use of volatile organic cations such as methylammonium and formamidinium.[6,7] a possible improvement can be expected from using inorganic cations, such as cesium.[8] For cesium lead halide perovskites, CsPbI3 with an optical bandgap of Eg 1⁄4 1.73 eV It has been found that the cubic perovskite a-phase of
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