ABSTRACT
Solar cell development demands exact and efficient analyzses of transparent conducting oxide and absorber materials. Optical analysis is usually done by means of ultraviolet–visible–near-infrared spectroscopy provides transmission spectra as a function of wavelength λ from about 200 to 3300 nm. Solar cells are bipolar semiconductor diodes. Optical stimulation of semiconductor materials with a direct band gap can be described with the relativistic Compton effect, Fermi–Dirac statistics for spontaneous and stimulated transitions and the Klein–Nishina cross section. In the case of a single-layer system, an incident beam is repeatedly reflected and transmitted at/through both surfaces of the medium. Approximations are shown for multilayered systems and measurements without an integrating sphere. Quantum mechanical potential barrier models are used to reevaluate spectra out of the physical values, in order to compare them with the originally measured spectra.
