Princeton University

School of Engineering & Applied Science

Chemistry of Lead Halide Perovskites: Aspects of Solution-Gelation and Acid-Base Reactions with Aliphatic Amines

Speaker: 
Ross Kerner
Advisor: 
Prof. Rand
Location: 
J401 Engineering Quadrangle
Date/Time: 
Monday, February 18, 2019 - 11:00am to 12:30pm

Abstract

Metal halide perovskites are an exciting new class of semiconductors for electronic devices including solar cells and light emitting diodes (LEDs). Outstanding electronic properties, ease of processing, and impressive device performances demonstrated in the laboratory make halide perovskites a very attractive technology. These materials display a wide range of compositional and structural tunability making it simple to manipulate the color, ranging from the near infrared through the visible spectrum into the near ultraviolet, as well as the physical form-factor for any given application. Commercialization is hindered by the poor stability of halide perovskite inks, precursors, and devices. Material instability stems from strong chemical reactivity of the parent compounds including halides and soft metal ions.

In this dissertation defense, I will discuss my contributions toward understanding halide perovskite chemical interactions in solution and solid-state. Our strategies offer improved control over processing and thin film morphology/composition for superior performance in LEDs. Additionally, I will describe chemical reactions occurring between metal halide precursors and common ink additives producing an impurity that has both positive and negative impacts on electronic properties and material stability. The viability of this technology hinges on identifying and controlling the full array of chemical reactions afflicting halide perovskites.