Abstract
Inorganic halide perovskites such as cesium lead halide are promising due to their excellent thermal stability. Cesium lead iodide (CsPbI3) has a bandgap of 1.73 eV and is very suitable for making efficient tandem solar cells, either with low-bandgap perovskite or silicon. However, the phase instability of CsPbI3 is hindering the further optimization of device performance. Here, we show that high quality and stable α-phase CsPbI3 film is obtained via solvent-controlled growth of the precursor film in a dry environment. A 15.7% power conversion efficiency of CsPbI3 solar cells is achieved, which is the highest efficiency reported for inorganic perovskite solar cells up to now. And more importantly, the devices can tolerate continuous light soaking for more than 500 h without efficiency drop.
Highlights
Inorganic halide perovskites such as cesium lead halide are promising due to their excellent thermal stability
After Solvent-controlled growth (SCG), we observed that the color of the precursor films gradually changed from greenish-yellow to light black during SCG
We found that our SCG method could be extended to obtain high-quality CsPbI2Br films (Supplementary Fig. 15)
Summary
Inorganic halide perovskites such as cesium lead halide are promising due to their excellent thermal stability. There are several efforts to stabilize the α-phase of CsPbI3 to make efficient solar cells[25, 34,35,36,37,38,39,40,41,42], such as tuning the tolerance factor of perovskite structure by partially substituting iodide with bromide to form CsPbI2Br or CsPbIBr234–37, reducing the crystal size[25, 40, 42], or introducing intermediate phase such as Cs4PbI641.
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