Abstract
Improving the stability of hybrid organic-inorganic halide perovskite materials is urgent and essential for their applications in optoelectronic devices. Here, we introduce n-butylammonium iodide (BAI) into lead-iodide crystals as guest molecules. As a result of guest effect, only a small amount BA2PbI4 two-dimensional (2D) perovskite (n = 1) is formed in PbI2-BAI films. Most of BAI crystals efficiently cut and squeeze the lattice network of lead iodide. The better orientation of 2D lead iodide crystals is obtained via this guest effect. In the following sequential deposition process, that BAI re-dissolve in MAI isopropanol (IPA) solution leads to a mesoporous structure of PbI2 and introduces a 2D perovskite (n = 2) protect layer in 3D MAPbI3 after annealing. Finally, the morphology, crystallization and stability of CH3NH3PbI3 are simultaneously improved by the insertion of BAI guest molecules. Consequently, CH3NH3PbI3 PSCs with an optimized cutting behavior exhibited a power conversion efficiency of 18% and significantly improved the stability.
Original language | English |
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Article number | 123589 |
Journal | Chemical Engineering Journal |
Volume | 391 |
DOIs | |
State | Published - Jul 1 2020 |
Bibliographical note
Funding Information:This work was supported by National Natural Science Foundation of China under Grant Nos. 61421002 , 61874150 , 61574029 , and 61471085 . This work was supported by 2018 Miaozi Project of Sichuan Science and Technology Innovation. Appendix A
Publisher Copyright:
© 2019 Elsevier B.V.
Keywords
- 2D-3D perovskite
- Guest effect
- Ion exchange
- Lattice compression
- Sequential deposition
- Stability
ASJC Scopus subject areas
- Chemistry (all)
- Environmental Chemistry
- Chemical Engineering (all)
- Industrial and Manufacturing Engineering