Defect states in MAPbBr3 by photo-induced current transient spectroscopy

Foschi, Martina (2022) Defect states in MAPbBr3 by photo-induced current transient spectroscopy. [Laurea magistrale], Università di Bologna, Corso di Studio in Physics [LM-DM270]
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Abstract

In the past decade, perovskites have been under the spotlight as promising semicon- ductors with unique properties. Hybrid halide perovskites show excellent characteristic properties suitable for optoelectronic applications as tunable band gap, high absorption coefficient, large mobility and long carrier recombination lifetime. However, a complete understanding of environmental instability and the nature of defects in these materials is still lacking, hindering the development of perovskite-based technologies. In this work we studied MAPbBr3 single crystals, fabricated with Inverse Temperature Crystallization (ITC) technique, with Photo-Induced Current Transient Spectroscopy (PICTS). PICTS is a transient photocurrent measurement rarely employed for studying perovskites mate- rials, that allows for the defects characterization in high resistivity materials. We studied the samples under different conditions, such as negative and positive voltage biases, bias stress, different contact geometries and different illumination wavelengths, in order to study their effect on the material physical properties and to evaluate the trap activation energies and their behavior under different working conditions.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Foschi, Martina
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
MATERIALS PHYSICS AND NANOSCIENCE
Ordinamento Cds
DM270
Parole chiave
PICTS,MAPbBr3,defects
Data di discussione della Tesi
25 Marzo 2022
URI

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