Abstract
Operational stability of perovskite solar cells (PSCs) is essential for commercial viability. In this work, we report our efforts to understand the impact of potassium cations on mitigating the morphological defects in the methylammonium-free formamidinium-based perovskite photoactive layer. The addition of potassium cations is favorable for the stable operation of FA0.85Cs0.1K0.05PbI3-based PSCs through retarding the transformation of the intermediate phases. FA0.85Cs0.1K0.05PbI3-based PSCs can retain 96% of the initial power conversion efficiency (PCE) after a 2 month accelerated aging test, whereas more than 40% drop in PCE is observed in FA0.9Cs0.1PbI3-based PSCs during the same aging test. The use of potassium cations provides a practical solution to mitigate the morphological defects in the perovskite layer and thereby enhances the operational stability of the FA0.85Cs0.1K0.05PbI3-based PSCs.
| Original language | English |
|---|---|
| Pages (from-to) | 8304–8312 |
| Number of pages | 9 |
| Journal | ACS Applied Energy Materials |
| Volume | 5 |
| Issue number | 7 |
| Early online date | 13 Jul 2022 |
| DOIs | |
| Publication status | Published - 25 Jul 2022 |
Scopus Subject Areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering
User-Defined Keywords
- cation engineering
- charge collection
- morphological defects
- perovskite solar cells
- stability
