Abstract
Inorganic CsPbI3 perovskite has shown much promise as a light absorber in perovskite solar cells (PSCs) due to its appropriate optical bandgap and high chemical stability. However, it is still a great challenge to deposit large-area CsPbI3 perovskite films by existing methods (e.g. spin coating). Herein, a facile and scalable strategy based on a drop-casting process is developed. To mitigate the coffee ring effect (CRE) that commonly occurs during drop casting, a vacuum-assisted (VA) process is exploited to boost solvent extraction, which significantly reduces the difference in solvent evaporation rates at the edge and middle regions of droplets. As a result, uniform CsPbI3 perovskite films with higher crystallinity and lower defect density are deposited by drop casting. By using the CsPbI3 perovskite film as a light absorber, the carbon-based CsPbI3 PSCs without hole transport layer achieves an efficiency of 16.33 %, a new record for inorganic C-PSCs. After finely controlling deposition processes, a large-area CsPbI3 perovskite film (5 × 5 cm2) with excellent uniformity can be easily prepared by the drop casting method.
Original language | English |
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Article number | 140147 |
Journal | Chemical Engineering Journal |
Volume | 454 |
DOIs | |
Publication status | Published - 15 Feb 2023 |
Keywords
- Carbon electrode
- Coffee ring effect
- CsPbI
- Drop casting