Title:	Influência da morfologia na dinâmica de aniquilação de éxcitons em materiais orgânicos
Authors:	Pereira Filho, Uislei Marques
Orientador(es)::	Oliveira Neto, Pedro Henrique de
Coorientador(es)::	Carrasco, Ismael Segundo da Silva
Assunto::	Éxcitons Semicondutores orgânicos Semicondutores orgânicos Recombinação radiativa Recombinação não radiativa
Issue Date:	16-Jun-2026
Data de defesa::	2-Mar-2026
Citation:	PEREIRA FILHO, Uislei Marques. Influência da morfologia na dinâmica de aniquilação de éxcitons em materiais orgânicos. 2026. 79 f., il. Dissertação (Mestrado em Física) — Universidade de Brasília, Brasília, 2026.
Abstract:	Exciton dynamics plays an essential role in the efficiency of organic photovoltaic (OPV) devices, in which radiative and non-radiative recombination processes directly compete with energy transport. In particular, exciton–exciton annihilation constitutes one of the main loss mechanisms in donor polymer systems and is strongly influenced by the morphological organization of the donor layer. In this context, this work investigates the influence ofdifferent morphologies on exciton dynamics in organic materials, with emphasis on the role of morphological domain thickness over the relevance of annihilation process. To this end, KineticMonte Carlo simulations are employed, using energy transfer and radiative emission rates described by Förster theory. The analyzed morphologies consist of three-dimensional domains of polythiophene (PTh) and poly(p-phenylene vinylene) (PPV) dimers, materials widely used asdonors in organic optoelectronic devices. Within this framework, the competition between fluorescence and annihilation processes, as well as exciton transport under different morphological configurations, is analyzed. The results indicate that variations in domain thickness significantly affect exciton dynamics, highlighting the importance of morphological control as a strategy to mitigate annihilation losses and enhance energy transport in organic systems.
metadata.dc.description.unidade:	Instituto de Física (IF)
Description:	Dissertação (mestrado) — Universidade de Brasília, Instituto de Física, 2026.
metadata.dc.description.ppg:	Programa de Pós-Graduação em Física
Appears in Collections:	Teses, dissertações e produtos pós-doutorado

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