Faculty Mentor(s)

Dr. Jeffrey Christians, Engineering

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Halide perovskites offer exciting potential as photovoltaic materials and simply as semiconductors. Specifically, their structural tunability has become of greater interest as researchers begin to search for novel ways to tune the materials to achieve improved solar cell stability or to target new applications. One potential technology which halide perovskites could enable is dynamically switchable photovoltaic windows: windows which can transition between photovoltaically active (dark) and non-photovoltaic (transparent). We build toward this goal in this work by investigating the intercalation and deintercalation of methylamine gas into 2-dimensional Ruddlesden-Popper (R-P) phase halide perovskites of the type A2PbI4. As has been shown with 3D methylammonium lead iodide films, the intercalation of methylamine into the halide perovskite lattice results in a color change to a clear crystalline phase. We find that in some 2-D perovskite systems, deintercalation of the methylamine gas is incomplete, resulting in the formation of secondary phases including n=2 R-P and 3D perovskites, as well as lower dimensional materials; however, other 2-D perovskite phases show reversible intercalation/deintercalation with methylamine, indicating stronger binding between the long-chain ligand and the lead halide octahedra of the 2-D perovskite sheet. This work reveals the relative affinity of various R-NH3+ molecules, specifically R-C8H9-NH3+ materials such as 4-hydroxy phenethyl ammonium, for the halide perovskite lattice and indicates that templating the 3-D CH3NH3PbI3 structure with carefully selected long-chain cations could lead to better reversibility in dynamic photovoltaic windows. Work continues to develop improved guidelines for the design of 2D/3D halide perovskite materials for an array of applications.


This work was supported in part by the Hope College Dean of Natural and Applied Sciences and the Hope College Department of Engineering. JC acknowledges support by the Towsley Research Scholars Program grant from the Towsley Foundation of Midland, Michigan. EC and JS acknowledge support by the Clare Booth Luce Research Scholar program and the Ernest Haight Summer Research Fund in Engineering.

Title on poster differs from abstract booklet. Poster title: Exploring Halide Perovskite Tunability to Design Materials for Dynamic Photovoltaic Windows

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