Laminated battery and preparation method thereof

Abstract

The invention provides a laminated battery and a preparation method thereof, and relates to the technical field of photovoltaics. The laminated battery comprises an upper battery unit, a lower batteryunit and a middle battery unit positioned between the upper battery unit and the lower battery unit, the upper battery unit comprises an upper light absorption layer; the middle battery unit comprises a middle light absorption layer; the lower battery unit comprises a lower light absorption layer; the band gap of the middle light absorption layer is gradually decreased or decreased in a gradientmanner in the direction from the light facing surface to the backlight surface; and the band gap of the light-facing surface of the middle light absorption layer is smaller than that of the upper light absorption layer, and the band gap of the backlight surface of the middle light absorption layer is larger than that of the lower light absorption layer. In the embodiment of the invention, the middle battery unit can effectively utilize the sunlight missed by the upper battery unit and the lower battery unit, fills up the trough of the absorption intensity of the upper battery unit and the lower battery unit due to the band gap difference, has a relatively flat filling effect, and improves the energy conversion efficiency of the laminated battery.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a stacked battery and a preparation method for the stacked battery. Background technique [0002] The structure of the laminated battery is mainly divided into an upper battery and a lower battery. Generally speaking, the light-absorbing material of the upper battery on the light-facing side has a larger band gap, and mainly absorbs the part of the spectrum with higher energy in sunlight. The light-absorbing material of the lower battery on the backlight side The band gap is small, and it mainly absorbs the lower-energy part of the spectrum of sunlight that passes through the upper cell, thereby improving the energy conversion efficiency of the laminated cell to sunlight. [0003] However, in the absorption spectra of the upper battery and the lower battery, there are absorption peaks at different positions. Although the absorption range of the laminated battery is widened,...

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Problems solved by technology

[0003] However, in the absorption spectra of the upper battery and the lower battery, there are absorption peaks at different positions. Although the absorption range of the laminated battery is widened, due to the different positions of the absorption peaks, the positions of the absorption peaks of the upper battery and the lower battery are between There are "troughs" of low absorption intensity, resulting in partial sunlight that cannot be effectively used, limiting the efficiency of stacked cells

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