Dr. Hannah Smith "Tutorial on Photoelectron Spectroscopy: A Practical Guide for Understanding and Analyzing PES Data"

Apr 26
April 26, 2023 11:00 am - 12:00 pm

Dr. Hannah Smith

Tutorial on Photoelectron Spectroscopy:
A Practical Guide for Understanding and Analyzing PES Data

Photoelectron spectroscopy (PES) is a powerful technique that enables the determination of the key electronic properties of materials and chemical composition and environment information. The determination of the ionization energy (IE), electron affinity (EA), work function, and the position of the Fermi level relative to the conduction or valence band for a given material is highly relevant for many fields, including photovoltaics. Knowing these parameters enables the intelligent design of devices and provides a fundamental understanding of the energetic barriers between materials. In this presentation, I will provide an introduction to direct photoelectron spectroscopy, including ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS), as well as inverse photoelectron spectroscopy (IPES). Topics presented will include the fundamental mechanism of PES, the experimental setup, the calibration of data, and sample preparation. There will be a specific focus on analyzing the data collected on organic semiconductors and perovskites. I will also provide some examples of the results from previous PES experiments, including the characterization of a series of organic semiconductors, shifts in the Fermi level due to doping organic semiconductors, the interface energetics of perovskites with metal oxides and organic transport layers, and the interface between organic and inorganic semiconductors.

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