Silicon substrate heterojunction solar cell with band gap being controllable

Abstract

The invention relates to a silicon substrate heterojunction solar cell with band gap being controllable, which combines characteristics of crystalline silicon and thin film material to form an amorphous silicon-carbon/amorphous silicon/microcrystalline silicon/crystalline silicon solar cell structure, being favorable for mitigating photoinduced attenuation effect of amorphous silicon film and improving stability of solar cell; dual heterojunction is formed semi-conductive material interfaces of different types or structure, two-dimensional electron gas effect is fully utilized, and carrier yield is efficiently enhanced; the formed high and low heterojunction electric field is favorable for migration of imbalance minority carriers and reduction of compound effect; a window effect is formed by utilizing semi-conductive materials of different band gaps, thus realizing selective absorption of the materials to light of different frequency bands, improving overall efficient utilization of incoming lights, enhancing photoelectric conversion efficiency of solar cell and promoting development of photovoltaic generation industry.

Description

technical field [0001] The invention relates to the technical field of solar cell photovoltaic power generation, in particular to a silicon-based heterojunction solar cell with an adjustable band gap. Background technique [0002] As a sustainable and clean energy, solar energy has great potential for development and application. Nowadays, the solar cell industry that develops rapidly in the field of photovoltaic power generation mainly includes crystalline silicon solar cells and thin film solar cells. The development of crystalline silicon solar cells has a relatively mature technical process, but due to factors such as raw material prices, complex production processes, high energy consumption, and pollution, the production cost of this type of cell is relatively high, and from the perspective of improving photoelectric conversion efficiency , the technology still needs to be further improved. Thin-film solar cells have a wide range of raw materials, low production costs...

AI Technical Summary

Problems solved by technology

However, the problems faced by solar cells with this structure are the growth technology of the buffer layer, the process optimization of the conductive film, the metal-silicon alloying under low temperature conditions, and the electrode optimization. Very sensitive, so its production is a great challenge for industrialization

In addition, the absorber layer of the battery adopts amorphous silicon thin film, which will lead to photodegradation effect

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