Method for simultaneously improving open-circuit voltage and stability of full-suede perovskite/crystalline silicon laminated solar cell

Abstract

The invention discloses a method for simultaneously improving open-circuit voltage and stability of a full-suede perovskite / crystalline silicon laminated solar cell, and belongs to the technical field of solar cells. The solar cell is composed of a crystalline silicon bottom cell, a microcrystalline silicon tunneling composite layer and a perovskite top cell, a two-dimensional / three-dimensional perovskite bulk phase heterojunction light absorption layer of the perovskite top cell is prepared based on a vacuum-assisted two-step method, and in the first step, vapor deposition is carried out on lead iodide and cesium bromide at the same time through thermal evaporation vacuum deposition equipment; forming a layer of lead iodide and cesium bromide mixed inorganic compound film; and 2, coating the inorganic compound film with a ternary cation mixed organic ammonium salt solution of formamidine, guanidine and thiophene organic ammonium in a liquid phase manner. The introduction of guanidine cations can inhibit the migration of halide ions in the formamidino three-dimensional perovskite thin film and the in-situ formation of the thiophene organic ammonium-based two-dimensional perovskite at the grain boundary, thereby realizing the preparation of the high-performance full-suede perovskite / crystalline silicon laminated solar cell.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a method for simultaneously improving the open-circuit voltage and stability of full-textured perovskite / crystalline silicon stacked solar cells. Background technique [0002] Regardless of the fabrication process used, the efficiency of single-junction solar cells has almost reached the theoretical limit, while the series complementary structure of solar cells with different band gaps is expected to break through the single-junction Shocker-Queisser limit. In a stacked structure, high energy photons generate high voltage in the top cell, low energy photons are absorbed in the bottom cell, the use of higher bandgap materials will reduce thermalization losses, and lower bandgap materials collect the remaining non-absorbing Light will reduce sub-bandgap losses. [0003] Organic-inorganic hybrid three-dimensional perovskites have excellent optoelectronic properties ...

AI Technical Summary

Problems solved by technology

Compared with the easily volatile methylamine cation, the perovskite film based on formamidine cation has high photoelectric conversion efficiency and higher stability, but it is prone to phase transition, and the iodide ion in the perovskite film is easy to generate migrate and form voids

It has been reported (Zhou Y. et al. Adv. Funct. Mater. 2019, 29, 1905739) that the defect formation of halide ions can be effectively suppressed by introducing guanidine (GA) ions, but the ionic radius of guanidine is too large, which is easy to cause formamidine The tensile stress of the base perovskite is too large, which brings adverse effects

The introduction of two-dimensional perovskite can release the stress, but its insulating organic spacer cations limit the transport of charges in the two-dimensional perovskite film, so the relationship between the two needs to be balanced

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