PERC-CZTS laminated solar cell and preparation method thereof

Abstract

The invention discloses a PERC-copper-zinc-tin-sulfur laminated solar cell and a preparation method of the PERC-copper-zinc-tin-sulfur laminated solar cell. The battery comprises a bottom-layer battery, a top-layer battery, a connecting layer arranged between the bottom-layer battery and the top-layer battery, and a transition layer, a window layer and a top-layer electrode which are arranged on the top-layer battery, the top-layer battery is copper-zinc-tin-sulfur; the connecting layer is a tunneling layer formed by an ultrathin silicon oxide layer and a MoSxOy layer. The preparation method comprises the following steps: S1, cleaning and texturing a P-type silicon wafer; s2, performing front diffusion to form a phosphorosilicate glass layer, and performing alkali polishing on the back; s4, performing front oxidation to form an ultrathin silicon oxide layer; s5, depositing a second passivation layer and a first passivation layer on the back surface; s6, preparing a bottom layer electrode; s7, depositing a MoSxOy layer on the ultrathin silicon oxide layer by adopting magnetron sputtering to form a connecting layer; s8, magnetron sputtering: depositing copper, zinc, tin and sulfur on the connection layer to form a top layer cell; s9, sequentially depositing a transition layer and a window layer on the top cell by adopting magnetron sputtering; and S10, finally printing electrode slurry on the window layer, and heating and sintering to obtain the laminated solar cell.

Description

technical field [0001] The invention relates to the field of solar cell preparation technology and device technology, in particular to a PERC-copper-zinc-tin-sulfur laminated solar cell and a preparation method thereof. Background technique [0002] Solar power generation can be said to be an inexhaustible clean energy source, and is considered to be an effective way to solve the energy crisis, environmental pollution and global warming problems. In the current photovoltaic power generation market, crystalline silicon Solar cells dominate. At present, PERC cells in silicon-based solar cells basically account for 80% of the global solar energy market, and the cost performance is the best battery at present. The theoretical limit efficiency of PERC cells is 24.5%, and the mass production efficiency has basically reached more than 23.3%. There is basically no room for cost reduction and efficiency improvement. However, the mass production efficiency of N-type HJT and Topcon c...

AI Technical Summary

Problems solved by technology

The bandgap of a traditional single-cell PERC battery is about 1.1eV, which is less than the optimal battery bandgap width of 1.4eV. Basically, high-energy photons within 400nm cannot be used, and about 20% of the spectral energy will be lost.

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