Abstract
In this study, we investigated the nucleation mechanism of perovskite films by employing isopropanol (IPA), a weakly coordinating solvent, to anneal both PbI2 and CH3NH3PbI3 in the sequential deposition and CsPbI3 in the one-step deposition. IPA solvent annealing (IPA SA) of PbI2 films was carried out at different temperatures. The grain size, compactness, roughness and morphology of PbI2 and CH3NH3PbI3 films were seriously affected by annealing methods. Similarly, weakly coordinating solvent annealing process was also employed to anneal all inorganic CsPbI3 perovskite in a one-step method. A continuous and dense CsPbI3 film with uniform grain size was obtained. We recognized that weakly coordinating solvent annealing for perovskite could regulate the dissolution-recrystallization process via controlling the volume of residual solvent in perovskite intermediate films. The power conversion efficiency (PCE) of conventional CH3NH3PbI3 perovskite solar cells (PSCs) reached 17.4% and that of CsPbI3 PSCs reached 2.5% based on this sequential IPA SA process.
| Translated title of the contribution | Reveal the growth mechanism in perovskite films via weakly coordinating solvent annealing |
|---|---|
| Original language | English |
| Pages (from-to) | 1536-1548 |
| Number of pages | 13 |
| Journal | Science China Materials |
| Volume | 61 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 1 2018 |
Bibliographical note
Publisher Copyright:© 2018, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Funding
This work was supported by the National Natural Science Foundation of China (61574029, 61421002 and 61574029). This work was also partially supported by University of Kentucky. Yafei Wang received his bachelor’s degree in electronic science and technology from Huaqiao University in 2012. He is currently a PhD candidate of optical engineering at the University of Electronic Science and Technology. His study mainly focuses on the synthesis and application of functional nanomaterials for perovskite solar cells. Zhi David Chen received his PhD degree in electrical engineering from the University of Illinois at Urbana-Champaign in 1999. He was Assistant Professor in 1999 and Associate Professor in 2004, and is currently Professor of Electrical Engineering at University of Kentucky. He is also Visiting Professor at the University of Electronic Science and Technology of China. He was Associate Director of Center for Nanoscale Science and Engineering and Director of Graduate Studies of the Electrical & Computer Engineering at University of Kentucky. He has published over 80 papers in refereed journals and over 50 in conference proceedings. Shibin Li is currently a Professor in the School of Optoelectronic Science and Engineering at the University of Electronic Science and Technology of China (UESTC). He received his PhD from UESTC in 2008. He joined the Department of Electrical & Computer Engineering at the University of Kentucky and University of Arkansas, USA, as a postdoctoral fellow in 2008.9 and 2009.9, respectively. He was an Associate Professor in UESTC from 2011 before his current position. His research group focuses on nanoscale materials for solar cells, flexible sensors and photodetectors.
| Funders | Funder number |
|---|---|
| University of Illinois, Urbana-Champaign | |
| University of Kentucky | |
| National Natural Science Foundation of China (NSFC) | 61574029, 61421002 |
| Huaqiao University | |
| University of Electronic Science and Technology of China | 2009.9 |
Keywords
- perovskite solar cells
- recrystallization
- solvent annealing
- weak coordinating solvent
ASJC Scopus subject areas
- General Materials Science
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