Physics of the Solid State
Volumes and Issues
Electrical properties of tandem solar cells based on films of organic-inorganic perovskites deposited on thin-film silicon solar cells
Nenashev G. V. 1, Fokina N. A.1,2, Dunaevskiy M. S. 1, Aleshin A. N. 1
1Ioffe Institute, St. Petersburg, Russia
2St. Petersburg State Electrotechnical University “LETI", St. Petersburg, Russia

This study presents an analysis of the morphological and electrical properties of multilayer structures fabricated using thin films of organometallic halide perovskites (OHP), specifically CH3NH3PbI3, deposited onto the surface of crystalline silicon (c-Si)-based solar cells. The structural morphology and electrical characteristics of these multilayered configurations were investigated through atomic force microscopy (AFM), current-voltage (I-V) characterization, and impedance spectroscopy. The AFM observations revealed significant morphological variations among the produced samples. I-V analysis conducted at 300 K indicated that all samples exhibited enhanced photoconductivity relative to pure c-Si, suggesting a beneficial influence of the perovskite layer. Impedance spectroscopy analysis revealed that in the absence of light, a sample with a perovskite layer on c-Si displayed two semicircles in its Nyquist plot, implying the coexistence of two distinct processes, such as ion diffusion or charge recombination. These processes appear to converge into a single mechanism upon exposure to light, a change attributed to the altered concentration of charge carriers. The findings of this research pave the way for further optimization and enhancement of the performance parameters of advanced tandem c-Si solar cells with top layers composed of organometallic halide perovskites. Keywords: impedance spectroscopy, electrical conductivity, solar cells, organic-inorganic perovskites, crystalline silicon.
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