Banca de QUALIFICAÇÃO: ROMULO CORREIA FERREIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ROMULO CORREIA FERREIRA
DATA : 28/05/2018
HORA: 10:00
LOCAL: Departamento de Química sala 48
TÍTULO:

Synthesis and characterization of chalcone-tetrathiophene copolymers in Acceptor-Donor-Acceptor system (A-D-A) for application in photovoltaic devices

PALAVRAS-CHAVES:

photovoltaic devices

thiophene chalcone copolymer

aceptor-donor-aceptor system

PÁGINAS: 25
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Orgânica
ESPECIALIDADE: Fotoquímica Orgânica
RESUMO:

From the environmental point of view, the conversion of photovoltaic energy is the most promising of renewable energy technologies due to its great potential of use, verified through the flow of solar energy that reaches the terrestrial surface. Even considering that the inorganic photovoltaic devices present higher efficiency, the organic devices have several advantages that justify the advancement in research and development of this technology: low-cost manufacturing of large devices, low temperature manufacturing and the possibility of deposition of the active layers on plastic substrates, which increases the possibilities of applications. Recent studies show that the use of hybrid molecules containing donor and electron acceptor has a great potential to increase the efficiency of these devices. The combination of a donor molecule with an electron acceptor molecule, and taking into account the difference between its HOMO and LUMO (band-gap) energy levels, results in the semiconductor characteristics necessary for the existence of a photovoltaic effect. The band-gap semiconductor polymer system may be the result of the combination of the donor moiety with the electron acceptor (DA) generating a new band-gap of lower energy since they will be new HOMO and LUMO levels were formed, distinct from those presented by donor (D) and electron acceptor (A) molecules, before the combination. In this sense, this research project aims at the synthesis of different molecules consisting of fluorochemical chalcones and tetrathiophene (TCH) in an acceptor-donor-acceptor (ADA) system, aiming to evaluate the influence of their structural and electronic characteristics, by verifying the following photovoltaic parameters : power conversion efficiency, fill factor, maximum power, short-circuit current and open-circuit voltage.

MEMBROS DA BANCA:
Interno - 386645 - AURELIO BAIRD BUARQUE FERREIRA
Externo ao Programa - 386996 - FRANCISCO DE ASSIS DA SILVA
Externo à Instituição - JOSUÉ SEBASTIAN BELLO FORERO - UFRJ