Solvent-controlled growth of inorganic perovskite films in dry environment for efficient and stable solar cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29884815.
- Also identified by DOI 10.1038/s41467-018-04636-4 and PMC identifier 5993712.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Inorganic halide perovskites such as cesium lead halide are promising due to their excellent thermal stability. Cesium lead iodide (CsPbI<sub>3</sub>) 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 CsPbI<sub>3</sub> is hindering the further optimization of device performance. Here, we show that high quality and stable α-phase CsPbI<sub>3</sub> film is obtained via solvent-controlled growth of the precursor film in a dry environment. A 15.7% power conversion efficiency of CsPbI<sub>3</sub> 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.