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Stress Diagnostics And Crack Detection In Full-Size Silicon Wafers Using Resonance Ultrasonic Vibrations, Anton Byelyayev
Stress Diagnostics And Crack Detection In Full-Size Silicon Wafers Using Resonance Ultrasonic Vibrations, Anton Byelyayev
USF Tampa Graduate Theses and Dissertations
Non-destructive monitoring of residual elastic stress in silicon wafers is a matter of strong concern for modern photovoltaic industry. The excess stress can generate cracks within the crystalline structure, which further may lead to wafer breakage. Cracks diagnostics and reduction in multicrystalline silicon, for example, are ones of the most important issues in photovoltaics now. The industry is intent to improve the yield of solar cells fabrication. There is a number of techniques to measure residual stress in semiconductor materials today. They include Raman spectroscopy, X-ray diffraction and infrared polariscopy. None of these methods are applicable for in-line diagnostics of …
Effect Of Heat Treatments And Reduced Absorber Layer Thickness On Cu(In,Ga)Se2 Thin Film Solar Cells, Vinodh Chandrasekaran
Effect Of Heat Treatments And Reduced Absorber Layer Thickness On Cu(In,Ga)Se2 Thin Film Solar Cells, Vinodh Chandrasekaran
USF Tampa Graduate Theses and Dissertations
Thin film solar cells with Copper Indium Gallium Diselenide (Cu(In,Ga)Se2) absorber layers is one of the most promising candidates to emerge as an efficient solar cell technology in the near future. CIGS cells with efficiencies of 19.2 % have already been reported [1]. In this study, CIGS absorber layers are fabricated by a two-stage all-solidstate manufacture-friendly process. In the first stage, designated as precursor deposition, Copper and Gallium are sequentially deposited followed by co-deposition of Indium and Selenium. In the second stage, designated as selenization, the substrate is annealed at high temperatures in a selenium environment during which …
Molybdenum As A Back Contact For Cucl Treated Cds/Cdte Solar Cells, Matheshkumar Jayabal
Molybdenum As A Back Contact For Cucl Treated Cds/Cdte Solar Cells, Matheshkumar Jayabal
USF Tampa Graduate Theses and Dissertations
CdTe is one of the most promising absorbers for use in inexpensive semiconductor solar cells having achieved a high efficiency of 16.4% in small area cells [1]. One of the most important technological problems in obtaining high efficiencies is to have a good ohmic contact on the CdTe, which is characterized by a very high work function [2]. Cu is used as a dopant in CdTe at the contact to promote quantum mechanical tunneling [3]. But the oversupply of Cu causes the diffusion of Cu through CdTe to the underlying CdS layer resulting in the degradation of the cell performance. …