Surface passivation technology capable of improving performance of copper indium gallium selenium thin-film solar cells

Abstract

Copper indium gallium selenium (CIGS for short) thin-film solar cells have many advantages, and are one part, with the most development potential, of the solar cell technology. The invention relates to a method for passivating the interface between a back electrode and absorption layer CIGS in each CIGS solar cell, recombination of carriers on the interface is restrained, and thus the performance of the CIGS device is improved. The method includes the steps that after a solution with cadmium sulfate, thiourea and ammonia water mixed is heated for 2 min to 10 min, a substrate with a back electrode layer deposited is placed in the solution, heating is continued for 2 min to 10 min, and then a cadmium sulfide layer containing large particles is grown; a silicon dioxide layer is grown on the cadmium sulfide layer to serve as an insulation passivation layer, the large particles of cadmium sulfide are removed with an ultrasonic method, and then a passivation layer with nanostructure holes is formed; a CIGS absorption layer is further grown on the passivation layer, and then the absorption layer and the back electrode can make point contact. The open-circuit voltage and the fill factor of the CIGS solar cells prepared with the technology are increased, and the photoelectric conversion efficiency of the CIGS solar cells prepared with the technology is improved.

Description

technical field [0001] The invention belongs to the field of solar cells and relates to a copper indium gallium selenium thin film solar cell device. Background technique [0002] All energy comes from energy, and human beings cannot live without energy. Energy is the main basis for human survival, life and development. After entering the 21st century, the energy resources that can be developed by human beings' current technology will face a serious shortage crisis. Today's fossil fuel resources such as coal, oil and natural gas are increasingly depleted, and they can only last for decades. Therefore, it is necessary to find sustainable alternative new energy sources. In addition, the use of fossil fuels such as coal, oil and natural gas will also bring a series of environmental problems: the global greenhouse effect makes the global temperature rise and the sea level rises; air pollution; drought, desertification; exhaust gas, waste , A large amount of waste liquid is di...

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Problems solved by technology

In addition, the use of fossil fuels such as coal, oil and natural gas will also bring a series of environmental problems: the global greenhouse effect makes the global temperature rise and the sea level rises; air pollution; drought, desertification; exhaust gas, waste , A large amount of waste liquid is discharged, the natural resources are seriously wasted, and the human environment is seriously polluted

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