Investigation on the performance of multi-junction solar cells

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Investigation on the performance of multi-junction solar cells


Author: Chiang, Yan-yi
Title: Investigation on the performance of multi-junction solar cells
Degree: M.Eng.
Year: 2011
Subject: Solar cells.
Photovoltaic cells.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: x, 81 leaves : ill. ; 30 cm.
Language: English
InnoPac Record:
Abstract: In pursuit of high efficiency and low cost solar cells. III-V compound multi-junction (MJ) solar cells and concentrating photovoltaic (CPV) technology have been developed rapidly in the past four decades. Under the shadowing effect contributed by surrounding buildings. the power generation performance of a solar cell will be eliminated. Although a number of researches have been conducted to investigate the influence of shadings on solar cell performance, most of the studies focused on the shadowing impacts on traditional solar cells such as the mono-crystalline silicon (Si) cells. Therefore, this dissertation aims at evaluating the electric performance of the MJ solar cells with triple-junction (InGaP/GaAs/Ge) structure under shadowing effect and concentrating effect. In this study. the electric performance of the MJ solar cells under different shading locations and areas were analyzed with the utilization of solar simulator in the Solar Simulation Lab of The Hong Kong Polytechnic University. The electric performance parameters to be examined include short circuit current (Isc), circuit current density (Jsc), open circuit voltage (Voc), maximum power current (Imp), maximum power voltage (Vmp), maximum power output (Pmp). fill factor (FF) and conversion efficiency (η). Besides, the concentrating effect on enhancing the MJ solar cell performance was investigated with the use of Fresnel lens. Findings of the experimental and theoretical work suggest that both central and edge shadings result in negative effect on the solar cell performance. Poorer performance of the edge-shaded MJ solar cells might be caused by the central deactivated cell with higher recombination rate. Compared to Si solar cells, the MJ solar cells are more sensitive to the shading effect. Furthermore, this research indicates the significant impacts of light uniformity and the considerable rise in power output contributed by the concentrating effect. Overall, this dissertation highlights the importance of preventing the occurrence of shading sources surrounding the photovoltaic (PV) devices and provides valuable reference for applying MJ solar cells efficiently.

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