A kind of vertical tandem solar cell and its preparation method

Abstract

The invention discloses a vertical laminated solar battery and a preparation method thereof. The battery comprises a top layer battery, a middle layer battery and a bottom layer battery which are sequentially arranged from top to bottom; and the width of the bottom layer battery is smaller than the width of the middle layer battery. According to the preparation method of the invention, a novel two-dimensional semiconductor material is adopted to prepare the top layer battery and the bottom layer battery, the absorption of sunlight can be realized based on smaller thickness, material consumption is decreased, manufacturing costs are reduced, the electrical loss of the solar battery can be reduced, and the conversion efficiency of the solar battery can be improved; and a vertical multi-junction structure is adopted, which is equivalent to a plurality of pn junctions which are connected in series, and therefore, an output voltage is high; and the area of the periodically-repeated basic units of the battery is decreased, and therefore, output current can be reduced, and therefore, the battery is better suitable for grid-connected power generation.

Description

technical field [0001] This patent relates to a solar cell structure and its preparation method, in particular to a vertical stack solar cell and its preparation method. Background technique [0002] In recent years, problems such as environmental pollution and the greenhouse effect have become increasingly serious around the world, and traditional energy reserves have become less and less, and prices have become higher and higher. Therefore, human demand for clean energy is increasing. Solar photovoltaic power generation as a clean energy More and more attention has been paid. At present, most of the solar photovoltaic cells sold in the market are crystalline silicon solar cells, and the cost of power generation is still higher than that of traditional fossil energy. The cost of power generation can be reduced by improving the conversion efficiency of crystalline silicon cells, but at present the efficiency of crystalline silicon cells is close to the theoretical limit, an...

AI Technical Summary

Problems solved by technology

The sub-cells of traditional tandem solar cells are electrically connected by means of current matching. As the incident angle and spectrum of incident sunlight change, current mismatches between sub-cells are prone to occur, resulting in power loss.

In addition, the single-chip output voltage of crystalline silicon solar cells currently on the market is low (less than 0.8V), and must be connected in series to be used for grid-connected power generation

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