Abstract
Thin-film tandem structure with CuInSe2 and Cd1-xMgx Te solar cells and thin conducting transparent ZnTe layer between them are investigated. Cd1-xMgx Te (x < 0,1) in the top solar cell is used to expand the band gap of CdTe. From the measured transmission spectra of the top solar cell on the portion of the spectrum with low transmittance when periodic changes in transmittance (oscillations) significantly reduced, the absorption curves α(λ) and band gap of Cd1-xMgx Te (1,54 and 1,6 eV) have been found. Since the reflection coefficient and the oscillations in the measured transmission spectra significantly attenuated in the case of optical contact of Cd1-xMgx Te with ZnTe, transmission of the top solar cell of the tandem can be calculated with a small error ignoring the oscillations. It has been shown that the short-circuit currents of the top and bottom solar cells become equal with the band gap of Cd1‑x Mgx Te ~ 1,65 еВ.
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