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The Fabrication of New Light-Emitting Diodes Based on Perovskite/Porous Silicon-Containing Materials
La, Nghi
La, Nghi
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2021
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2021-05-19
Abstract
Within the last several years, solar cells based on a type of material known as metal halide perovskites have outpaced all other solar technologies in terms of efficiency, with the record currently at > 28%. Because of their unique structure and composition, perovskites display a number of interesting properties including excellent light absorption, charge carrier mobility, and associated lifetimes. Yet issues exist with regard to long term stability and control of perovskite film morphology. To address these, in this research project we examine the use of a material known as porous silicon as a template for perovskite formation. Porous silicon is a form of elemental semiconducting silicon with deliberately formed nanopores in its structures. Porous silicon serves two critical roles in the preparation and properties of the perovskite: (1) provide a nanoscale reaction vessel that effectively controls the perovskite growth; (2) manipulate charge carrier migration to/from the perovskite (a property key to its ultimate use a solar cell or light emitter). Our specific research project described here involves constructing new light-emitting diodes (LEDs) based on porous silicon and mesoporous silica-perovskite materials and then evaluating their stability as well as light emission in response to light absorption or passage of electric current. To date, we have successfully prepared films of bromide-containing perovskites loaded inside porous silicon and mesoporous silica that emit green light visible to the unaided eye upon application of a few volts (3-6 V). It is hoped that the methods investigated in this project will lead to new routes to light emitter fabrication.
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Chemistry and Biochemistry