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Using methylammonium (MA) along with an n-octylammonium cationic spacer, films of Ruddlesden-Popper phases of the form (BA)2(MA)n-1PbnI3n+1 were synthesized by spincoating, with lead iodide layer thicknesses of 1 to 4. Structural characterization by X-ray diffraction (XRD) shows a gradual texture change; lead iodide sheets change from being parallel to the substrate to perpendicular as the layer thickness increases. Optical measurements of absorbance and emission (Fluorimeter) help to confirm the phase purity of the distinct phases. Measurements of transient photoconductance by time-resolved microwave conductivity (TRMC) reveal carrier mobilities and lifetimes. We observe that charge transport in the in-plane and out-of-plane directions are comparable, suggesting the existence of transport pathways in all directions in our polycrystalline thin-films. The results of this work suggest that the interesting charge transport properties of these two-dimensional systems, along with their enhanced stability, give rise to a range of highly-stable, high-performance perovskite optoelectronic devices
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| Attachment | Size |
|---|---|
 Mark_Larsen_perovskite_research.pdf | 3.3 MB |
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The concept of solar energy is examined in this unit. These lessons were inspired by my work as a research intern investigating charge transport in a two-dimensional hybrid-halide perovskite. This material might someday provide a low cost alternative to harness the energy of the sun.
Students will investigate the development and use of solar power. They will examine the role of the sun as a source of energy and explore how humanity has relied on the sun to provide energy for our lives. These lessons focus on the development and use of solar power throughout human civilization. Students will engage in game and group activities to enhance their understanding of our reliance on the sun. They will conduct research on advancements in solar energy and how solar energy has been used throughout the ages by participating in the construction of a timeline. Students will expand their knowledge of solar power by designing and building a solar batch collector and solar oven.