Abstract
Silver orthophosphate powders with superior quality used in phosphorus-doped conductive pastes for solar cell metallization were obtained by precipitation from phosphate precursors. The powders were investigated by X-ray diffraction, scanning electron microscopy coupled with energy dispersive spectrometry, Fourier-transform infrared spectroscopy, thermal analysis, and diffuse reflectance spectroscopy. Spherical silver orthophosphate particles with a size of 0.8 to 10 μm were obtained by chemical precipitation, and the compound crystallized in a cubic symmetry. Relatively smaller crystallites were obtained from disodium hydrogen phosphate. The optical gap determined from the diffuse reflectance spectra using the Kubelka-Munk function varied between 2.05 and 2.30 eV. The electrical conductivity is characteristic of a semiconducting behaviour with activation energy of 0.20 eV. To improve the metal-semiconductor interface, the uniformity of powders of the deposited paste must be enhanced.
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