Mixed Cation FA x PEA 1– x PbI 3 with Enhanced Phase and Ambient Stability toward High-Performance Perovskite Solar Cells
Journal
Advanced Energy Materials
Journal Volume
7
Journal Issue
1
Date Issued
2017
Author(s)
Abstract
In this work, different from the commonly explored strategy of incorporating a smaller cation, MA + and Cs + into FAPbI 3 lattice to improve efficiency and stability, it is revealed that the introduction of phenylethylammonium iodide (PEAI) into FAPbI 3 perovksite to form mixed cation FA x PEA 1–x PbI 3 can effectively enhance both phase and ambient stability of FAPbI 3 as well as the resulting performance of the derived devices. From our experimental and theoretical calculation results, it is proposed that the larger PEA cation is capable of assembling on both the lattice surface and grain boundaries to form quais‐3D perovskite structures. The surrounding of PEA + ions at the crystal grain boundaries not only can serve as molecular locks to tighten FAPbI 3 domains but also passivate the surface defects to improve both phase and moisture stablity. Consequently, a high‐performance (PCE:17.7%) and ambient stable FAPbI 3 solar cell could be developed.
SDGs
Publisher
Wiley-VCH Verlag
Type
journal article