Banca de DEFESA: OLAVO DHYAN DE FARIAS CARDOZO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : OLAVO DHYAN DE FARIAS CARDOZO
DATE: 27/02/2023
TIME: 08:30
LOCAL: Sessão por videoconferência: Google Meet: (https://meet.google.com/erg-uwft-xib )
TITLE:

EVALUATION OF THE USE OF ZINC OXIDE NANODIFFUSERSFOR THIRD-GENERATION PHOTOVOLTAIC CELLS.

KEY WORDS:

Zinc Oxide,Nanoparticles, Nanodiffusers, Solar Cells. 

PAGES: 111
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

This work proposes a new approach in the exploration of zinc oxide (ZnO) nanoparticles(NPs) to improve the performance of third-generation solar cells, with a focus on organic solarcells (OSCs) and perovskite solar cells (PSCs). ZnO NPs dispersed on the top surface of thedevice can act as nanodiffusers, reducing its reflection and increasing the absorption of solarradiation in the photovoltaic active layer, by introducing non-orthogonal optical paths in thedevice (light pathway enhancement). The contribution of ZnOnanodiffusers in improving solarcells performance was analyzed through computer simulations, based on finite element method(FEM) as well as experimentally. ZnO nanoparticles with size of about 160 nm were synthesizedby a green synthesis route and characterized. Thin films formed by deposition of suspensionof ZnO NPs on the transparent indium tin oxide (ITO) electrode, by drop casting and spincoating methods, having its optical response evaluated. In this work we propose methodologiesfor optical and electrical modeling of third generation photovoltaic cells with the applicationof ZnO NPs at the top of the device. The results of the optical modeling indicate that ZnOnanospheres with a diameter of 160 nm present a high average Albedo value (0.88) in the visiblespectrum range, and scatter solar radiation predominantly in the forward direction. The use ofZnO NPs (160 nm in diameter) on the surface of an OSC can reduce the device’s reflectance byup to 95 % for λ = 530 nm, promoting an efficient light coupling in the cell’s active layer andsimultaneously increasing the absorbance (26 %) of the device. Light trapping and anti-reflectiveeffect contributions improve the generation of photocurrent, showing an increase in short-circuitcurrent density of 27.9 % for OSCs. For PSCs, an increase in absorbance of 32 % and a reductionin reflectance of 96 % was observed for λ = 530 nm. This work describes the manufacturingprocess of third-generation solar cells, both OSCs and PSCs. The optical gain generated byZnO nanostructures resulting from both, the anti-reflective effect and light scattering, has beendemonstrated with substrates containing the active material of the devices. With the depositionof ZnO NPs on PSCs, it was verified experimentally that the use of ZnO NPs deposited on top,yields in an enhancement in the efficiency of the photovoltaic device of 23.5 %.regime. 

COMMITTEE MEMBERS:
Presidente - 2199776 - RENATO EVANGELISTA DE ARAUJO
Interno - 2889145 - GUSTAVO MEDEIROS DE SOUZA AZEVEDO
Externo ao Programa - 2457389 - EDUARDO PADRON HERNANDEZ - UFPEExterno ao Programa - 1354207 - SEVERINO ALVES JUNIOR - UFPEExterno à Instituição - LUIS ARTURO GOMEZ MALAGON - UPE