= H. J. Hovel
{c}
A semiconductor researcher whose work with <Jerry M. Woodall> improved <gallium arsenide> <solar cells> using a <heterojunction>. A surface layer reduced <surface recombination> while transmitting much of the useful incident light. Comparing the spectral response before and after removing that layer exposed how surface losses suppress charge collection, connecting device efficiency with a measurable microscopic loss mechanism.<High-efficiency Ga1-xAlxAs-GaAs solar cells by Jerry M. Woodall and H. J. Hovel>[pp. 379–381, especially Fig. 1 and discussion of layer removal]{ref}
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