25 November 1980 Laser Scanning of Experimental Solar Cells
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Standard measurements of photovoltaic parameters are typically analyzed by modeling the solar cell as a two-terminal device with spatially uniform characteristics. These measurements give the average response of the cell, but provide little information on local features and flaws which are important in determining cell quality. In this paper we describe an instrument which measures and displays the response of the solar cell to a precisely positioned spot of HeNe laser light. By scanning the spot across the cell surface we can create a map of the spatial variation in response of the cell. This map allows us to isolate flaws in cell contact integrity, locate open top surface grid lines, and evaluate fundamental junction performance. The system is useful for identifying and locating changes in the cell as it progresses through various experiments (e.g. stability studies). The laser scanner system is designed to be flexible and can accomodate different types of solar cell materials and a wide range of spot and scan sizes. We describe several modes of operation of the equipment, and present results from two photovoltaic materials (CdS/Cu2S and Zn3P2) which demonstrate the capabilities of the system. Finally we discuss some of the proposed future uses of the system.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brian C. Plunkett, Brian C. Plunkett, Patrick G. Lasswell, Patrick G. Lasswell, } "Laser Scanning of Experimental Solar Cells", Proc. SPIE 0248, Role of Electro-Optics in Photovoltaic Energy Conversion, (25 November 1980); doi: 10.1117/12.970599; https://doi.org/10.1117/12.970599


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