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28 May 1999 Series of laser scanning techniques as a nondestructive tool for testing solar cells and batteries
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We have designed a series of original techniques able to obtain non-destructively the 2D distribution of the several important parameters. Laser scanning of dynamically loaded solar cell has been shown to give a distribution of the dark current density since this value determines the local heat power and the reflectivity of the cell surface. An additional positive voltage bias at local laser irradiation and typical working conditions applies to the solar cell due to the concentration of current lines within the illuminated spot and due to the voltage drop depending of the local emitter resistivity. Quantitative comparison of the resistance sensitive photocurrent distribution and such distribution in the resistance independent conditions gives an information about local resistivity. The analysis of LBIC signal obtained from the whole battery at the different bias voltage and illumination conditions has shown to investigate the contribution of each cell to the total efficiency and the energy losses, switching to the output contacts of the battery only. This approach makes it possible to monitor the cell characteristics in encapsulated modules directly in loading conditions and without their destruction.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sergiy V. Litvinenko, Leonid M. Ilchenko, Sergiy O. Kolenov, Eugene M. Smirnov, and Valery A. Skryshevsky "Series of laser scanning techniques as a nondestructive tool for testing solar cells and batteries", Proc. SPIE 3707, Laser Radar Technology and Applications IV, (28 May 1999);


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