Photovoltaic power generation is a technology that uses solar radiation to generate electricity. Solar cells are the easiest and most convenient way to generate electricity. Photovoltaic cells consist of multiple electrodes, each of which receives sunlight and converts it into electricity. Solar cells do not require fuel and do not require chemical processes. Therefore, it does not require fuel or chemical reagents, is not limited by seasonal conditions, and has no worries about environmental pollution.
1. How solar cells work
The working principle of the solar cell is: irradiate the sunlight on the battery, the battery collects and stores the solar energy, converts the collected electrical energy of the photovoltaic cell into electrical energy, and then outputs it from the battery. The solar cell is the most basic and important component in the solar power generation device, and each component in the photovoltaic power generation device can become a separate system, and its function is to convert light energy into electrical energy. The solar cell consists of two parts, one is the main circuit part and the other is the auxiliary circuit part. The main circuit includes the solar cell body, the solar cell and the bracket, and the auxiliary circuit includes: the collector, the electrolyte (including the electrolyte), the charge transfer device between the collectors, the contact point between the electrode and the medium, the electrolyte (liquid) and the Carrier transfer devices, etc.
2. Basic structure of solar cells
Solar cells are mainly composed of the following three parts: (1) Solar cell components: thin-film solar cells made of semiconductors and organic materials. Its main function is to convert photons into electrical energy, combine solar cells with organic materials, and convert the heat generated by solar cells into electrical energy. (2) Current output component: a solar cell group composed of diodes, which converts current into voltage and outputs energy. (3) Conversion efficiency components: convert the energy into electrical energy by absorbing the sunlight absorbed by the solar cells. (4) Photoelectric conversion components: convert light energy into electrical energy through photoelectric conversion components, or convert light energy into electrical energy and store it in a battery.
3. Main features of solar cells
Solar radiation is a very efficient energy source that can be used directly to generate electricity. As a way of energy utilization, for human society, there are two very important aspects, one is the pollution of the environment, and the other is the use of solar energy to generate electricity. From a technical point of view, solar cells are an important technical way to realize the effective utilization of solar energy and the clean utilization of energy, but due to its own defects: ① poor stability; ② can not store energy; ③ can not be used for various purposes; ④ lack of environmental impact. From a technical point of view, according to factors such as material selection, structural design and manufacturing process level, solar cells are used in various types of solar cells, which are mainly reflected in the photoelectric conversion efficiency of solar cells.
4. Solar cell production and sales process
The production process of solar cells is generally to select high-quality thin-film solar cells from the factory, and then make them into photovoltaic cells according to a certain proportion. Purchase a PERC cell module with an area of about 20 square meters from a solar cell supplier, then install it on the roof of the photovoltaic power station, and provide daily electricity, fire protection and communication power for the photovoltaic power station. At the same time, solar power generation projects must be licensed by production enterprises recognized by the state and complying with laws and regulations. Due to the particularity of photovoltaic power generation, it is very common to sell photovoltaic modules that do not meet product quality standards. If a photovoltaic project involves a large number of solar modules and the quality is not up to standard, it may bring losses to the enterprise. Therefore, ensuring product quality is a must for every photovoltaic equipment manufacturer. At the same time, it is also necessary for the state to formulate relevant laws to stipulate the measures that enterprises should take before issuing production licenses.