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Angle-dependent spectral photoresponse characteristics for theoretically perfect and physically implementable tunnel cascade (multi-junction) photoelectric converters (PC), for example high-voltage planar PV cells, have been studied as functions of technological parameters and number of single PCs in cascade. Angle-dependent spectral photoresponse characteristics values for real cascade silicon structures have been determined in visible and ultraviolet radiation spectra. Characteristic values of radiation incidence angle corresponding to the twofold photocurrent reduction in relation to normal incidence have been found depending on the number of single PCs in cascade, 'dead' layer thickness of tunnel junction and photosensitivity of the base PC. The possibility and practicability of solar trackers use in PV systems with proposed PCs under study have been evaluated. [ABSTRACT FROM AUTHOR]

In this work, results of research of spectral characteristics for idealized n+-p-p+(t)n+-p-p+(t) ... n+-p-p+ structures have been presented that correspond to conditions of negligibly low rate of bulk and surface recombination of charge carriers in photoactive p-layers of the structure. Upper-limit efficient cascade photoelectric converters on the base of such structures in semiconductor materials like silicon and germanium have been described. [ABSTRACT FROM AUTHOR]