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Effect of Formamidinium/Cesium Substitution and PbI2 on the Long-Term Stability of Triple-Cation Perovskites.
- Source :
- ChemSusChem; 10/9/2017, Vol. 10 Issue 19, p3804-3809, 6p
- Publication Year :
- 2017
-
Abstract
- Altering cation and anion ratios in perovskites has proven an excellent means of tuning the perovskite properties and enhancing the performance. Recently, methylammonium/formamidinium/cesium triple-cation mixed-halide perovskites have demonstrated efficiencies up to 22 %. Similar to the widely explored methylammonium lead halide, excess PbI<subscript>2</subscript> is added to these perovskite films to enhance their performances. The excess PbI<subscript>2</subscript> is known to be beneficial for the performance. However, its impact on stability is less well known. Triple-cation perovskites deploy excess PbI<subscript>2</subscript> up to 8 %. Thus, it is imperative to analyze the role of excess PbI<subscript>2</subscript> in the degradation kinetics. In this study, the amount of PbI<subscript>2</subscript> in the triple-cation perovskite films is varied and the degradation kinetics monitored by X-ray diffraction and optical absorption spectroscopy. The inclusion of excess PbI<subscript>2</subscript> is shown to adversely affect the stability of the material. Faster degradation kinetics are observed for samples with higher PbI<subscript>2</subscript> contents. However, samples with excess PbI<subscript>2</subscript> also showed superior properties such as enhanced grain sizes and better optical absorption. Thus, careful management of the PbI<subscript>2</subscript> quantity is required to obtain better stability and alternative pathways should be explored to achieve better device performance rather than adding excess PbI<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 10
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 125591560
- Full Text :
- https://doi.org/10.1002/cssc.201701203