Abstract: A method for recycling silver present on a photovoltaic cell comprising: —a step a) of supplying a photovoltaic cell including—a support substrate made of silicon, —an upper layer of doped silicon arranged on the support substrate, —a plurality of silver lines arranged on the upper layer, —at least one anti-reflective layer arranged on the upper layer and adjacent to the silver lines; —a step b) of etching the anti-reflective layer by immersing the photovoltaic cell in an acid solution; —a step c) of etching the upper layer by immersing the photovoltaic cell without an anti-reflective layer in a basic solution, leading to the separation of the silver lines; —a step d) of drying the assembly formed by the support substrate and the separated silver lines; —a step e) of extracting the silver lines in the solid state.

Abstract: A treatment method for purifying silicon microparticles contained in waste resulting from the cutting of ingots with a diamond wire comprises: a) providing a contaminated slurry, resulting from the waste, formed by an aqueous mixture comprising the silicon microparticles, organic species and metal contaminants; b) adding a dilute hydrogen peroxide solution to the contaminated slurry, in order to form a first mixture, and stirring the first mixture; c) solid/liquid separation of the first mixture in order to obtain, on the one hand, a first purified slurry and, on the other hand, a first liquid loaded with organic species and metal contaminants.

Abstract: A silicon granule, in particular, for the preparation of trichlorosilane, having a size of between 10 and 500 microns, and comprising: dopants in a weight fraction of less than 5 ppm; at least one co-catalyst selected from copper, iron, aluminum and calcium, in a weight fraction of between 1 and 2500 ppm; and metallic impurities, with exclusion of the at least one co-catalyst, in a weight fraction of less than 50 ppm.

Abstract: A silicon granule, in particular, for the preparation of trichlorosilane, having a size of between 10 and 500 microns, and comprising: dopants in a weight fraction of less than 5 ppm; at least one co-catalyst selected from copper, iron, aluminum and calcium, in a weight fraction of between 1 and 2500 ppm; and metallic impurities, with exclusion of the at least one co-catalyst, in a weight fraction of less than 50 ppm.