Por favor, use este identificador para citar o enlazar este ítem: https://hdl.handle.net/10495/28797
Título : Effect of rubidium fluoride on grain sintering and optoelectronic properties of nanostructured CuInSe2 thin films obtained by solution processing technique
Autor : Ruiz Velasquez, Jhoan Andres
metadata.dc.contributor.advisor: Handwerker, Carol
Agrawal, Rakesh
metadata.dc.subject.*: Solar cells
Energy conversion
Photovoltaic cells
Fecha de publicación : 2022
Resumen : ABSTRACT: Nowadays, although silicon-based solar cells have dominated the photovoltaic (PV) market, it has several limitations related to cost reduction. For instance, Si-based solar cells have low absorption coefficients, and indirect bandgap which means that is necessary to obtain at least 200 μm thickness for PV applications [1]. On the other hand, CuInSe2 (CISe) and Cu(In, Ga)(S, Se)2 (CIGS) absorber layers composed of a chalcopyrite-type structure have emerged as a promising alternative in the solar cell field due to their unique properties such as power conversion efficiencies (PCEs) above 20%, and high absorption coefficient (105cm-1), obtaining photovoltaic applications with 2 μm thickness what allows to reduce the use of raw material significantly [1],[2]. Recently, the addition of alkali elements such as sodium, potassium, rubidium, and cesium via post-deposition techniques (PDTs) has demonstrated an improvement in the general performance of CIGS-based solar cells developed via vacuum processing techniques. This study, however, examined the effect of rubidium fluoride (RbF) on the optical, electrical, and morphological properties of CISe thin films absorber layers developed via non-vacuum techniques which have shown an improvement in the throughput and are cheaper than vacuum processing methods. With the addition of rubidium fluoride via thermal evaporation to the CISe absorber layer, an increase in the grain size, photoluminescence intensity, carrier lifetime, appearance of nanopatterns, and external quantum efficiency on the CISe-based solar cells was found using the following characterization techniques: x-ray fluorescence (XRF), x-ray diffraction (XRD), grazing incidence angle (GIXRD), scanning electron microscopy (SEM), PL photoluminescence (PL), time-resolved photoluminescence (TRPL), and external quantum efficiency (EQE).
Aparece en las colecciones: Ingeniería de Materiales

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