Thin-film solar cell and method for making the same

Abstract

The invention discloses a thin-film solar cell and a method for making the same. The thin-film solar cell is applicable to matching the open-circuit voltage of multiple parallelly connected photovoltaic conversion blocks in the solar cell. The method comprises the following steps: forming a first photovoltaic conversion block having N serially connected first photovoltaic conversion units upon the first substrate; forming a second photovoltaic conversion block having m serially connected second photovoltaic conversion units upon the second substrate; gluing the first photovoltaic conversion block and the second photovoltaic conversion block; and electrically connecting the first photovoltaic conversion block and the second photovoltaic conversion block, thereby making the serially connected first photovoltaic conversion units be connected with the serially connected second photovoltaic conversion units in parallel. The open-circuit voltage of each first photovoltaic conversion unit is Vn while the open-circuit voltage of each second photovoltaic conversion unit is Vm. The ratio of m*Vn to n*Vm ranges from 0.9 to 1.1.

Description

technical field [0001] The invention relates to a thin-film solar cell and a manufacturing method thereof, in particular to a thin-film solar cell suitable for matching the open-circuit voltage of multiple parallel photoelectric conversion blocks and a manufacturing method thereof. Background technique [0002] Due to the rapid development of industry, the gradual depletion of fossil fuels and the emission of greenhouse gases have attracted increasing global attention, and the stable supply of energy has become a major global issue. Compared with traditional coal-fired, gas-fired or nuclear power generation, solar cells use photoelectric or thermoelectric conversion effects to directly convert solar energy into electrical energy, so there will be no greenhouses such as carbon dioxide, nitrogen oxides, and sulfur oxides. Effect gases and polluting gases, and can be used to reduce dependence on fossil fuels and provide a safe and independent source of electricity. [0003] Th...

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Problems solved by technology

However, it is worth noting that although this method can effectively increase the photoelectric conversion efficiency of the solar cell, the photoelectric conversion layers of different materials will have different open-circuit voltages under the same illuminance in such a solar cell with a parallel structure. Therefore, when photoelectric conversion layers of different materials are connected in parallel, the voltage after parallel connection cannot be matched, and it cannot be implemented at the practical application level.

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