Abstract
This work investigates the formation of photoluminescence centres in high-transmission glass (HTG) dopedwith Cu2O and their capability to transform the solar spectrum by absorption/emissionvia Stokes-shifted PL into a more efficient spectrum for photovoltaicapplications. Among the centres formed in HTG, both green photoluminescentCu + and thenon-photoluminescent Cu2 + centres are created but their relative concentration depends on the thermal treatment andthe presence of other co-dopants. The measurement of the absorption coefficientα(λ) nearby the HTGoptical gap for Cu + bands is accomplished by following the two-thickness method. This procedureallows us to obtain the actual absorption coefficient for the spectrum ofeach formed centre, from which we obtain the relative concentration ofCu + /Cu2 + as well as their absolute values. The analysis of the spectra provides information on theabsorption cross sections, transition energies and bandwidths, the knowledge of which isessential to check the suitability of such centres for photovoltaic applications in solarcells.
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