Myths and reality of HPbI<sub>3</sub> in halide perovskite solar cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30429470.
- Also identified by DOI 10.1038/s41467-018-07204-y and PMC identifier 6235929.
- 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
All-inorganic perovskites have a special place in halide perovskite family because of their potential for better stability. However, the representative cesium lead iodide (CsPbI<sub>3</sub>) is metastable and spontaneously converts to the non-perovskite structure at room temperature. Here, we demonstrate that what appears to be all-inorganic CsPbI<sub>3</sub> stabilized in its perovskite form using the purported intermediate known as hydrogen lead iodide (HPbI<sub>3</sub>) is, in fact, the hybrid perovskite cesium dimethylammonium lead iodide (Cs<sub>1-x</sub>DMA<sub>x</sub>PbI<sub>3</sub>, x = 0.2 to 0.5). Thus, many of the reported all-inorganic perovskites are actually still hybrid organic-inorganic perovskites, as strongly evidenced by a wide battery of experimental techniques presented here. Solar cells based on the representative composition Cs<sub>0.7</sub>DMA<sub>0.3</sub>PbI<sub>3</sub> can achieve an average power conversion efficiency of 9.27 ± 1.28% (max 12.62%). These results provide an alternative angle to look at previous results pertaining all-inorganic CsPbI<sub>3</sub> while the DMA cation is now revealed as an alternative A site cation.