In today's world, climate change cannot be ignored, and humans are increasingly aware of the protection of the living environment. As a responsible big country, China has also established the "four revolutions and one cooperation" energy development national policy of "energy consumption revolution, supply revolution, technological revolution, system revolution" and strengthening international cooperation.
As early as the early 1950s, RCA Laboratories produced the first CdTe thin-film solar cell with a conversion efficiency of 2.1%, demonstrating that cadmium telluride is a material that can be used to develop photovoltaic power generation technology. The study found that cadmium telluride and cadmium telluride thin-film solar cell technology has the following characteristics: First, cadmium telluride has a forbidden band width (~1.45 ev) matched to the ground solar spectrum and an absorption coefficient 100 times higher than that of silicon material ( > 105cm) and other material properties, suitable for the preparation of high-efficiency thin film solar cells; laboratory small area battery conversion efficiency has reached 22.1% (more than polycrystalline silicon batteries), 0.72m2 cadmium telluride thin film module efficiency has also reached 18.6%. Second, cadmium telluride has a lower temperature coefficient (-0.21%/K) and weak light effect than silicon materials; after a lot of practice has proved that the cadmium telluride thin film module's power generation capacity is higher than the polysilicon module 5-10 %. Third, cadmium telluride is a simple binary compound system, it is easy to generate single-phase materials. The study found that CSS (close distance sublimation) and VTD (vapor deposition deposition) technologies have high deposition rate (3-10 μm/min), good film quality, large grains, and high utilization of raw materials (>85% ) and other advantages, especially for large-scale production. Fourth, the production cost of the cadmium telluride thin film module is very competitive (the production cost of the first solar energy in the United States is about 0.34 US$/W); at the same time, the production cost of the cadmium telluride thin film module has great potential for reduction: the first largest solar energy in the United States. Area component product S6 (component area 2.16m2) achieves full production cost can be reduced to 0.25-0.28 US dollars / W; Fifth, large-scale application of cadmium telluride thin film components have been verified, the world is under construction and completed 10 Of the large-scale photovoltaic power plants, six use cadmium telluride thin-film modules. Sixth, a large number of studies have shown that cadmium telluride thin film components are environmentally friendly products; cadmium telluride is different from elemental cadmium, is a stable compound, can be used safely; cadmium telluride thin film components in a small amount of cadmium telluride, 1MWCdTe components Only about 150KG of cadmium telluride is needed; in the cadmium telluride thin film module, cadmium telluride will be sealed between two glass, and no cadmium will be released at normal temperature; even at high temperatures up to 1100°C, according to the test of BNL More than 99.96% of cadmium telluride has been sealed by the melting of two pieces of glass without leakage; compared with other types of solar cells and various types of fossil energy, the amount of cadmium released from cadmium telluride solar cell modules in the whole life cycle Is the lowest. Therefore, in 2012, the EU RoHS eliminated restrictions on cadmium telluride thin-film solar modules.
Due to historical reasons, China's photovoltaic industry has long been focusing on crystalline silicon solar cells with relatively mature industrialization technology; and on the need for large-scale independent innovation and investment in thin-film solar cell technologies, especially cadmium telluride thin film solar cell technology, the industrialization development speed Relatively slow. We firmly believe that this strategic emerging industry has achieved healthy development in China. The “Creation in China†must have four elements: First, China's industrialization core technology; Second, China's R&D and management team; Third, China's production equipment and raw materials; Fourth, China's production base, are indispensable . The next goal is to further expand the advantages of industrialization and realize the concept of “differentiated operation and cross-border developmentâ€: to take full advantage of the unique advantages of cadmium telluride thin-film solar cells, and to rely on the “building-based, agriculture-based†approach to development. With a high degree of customization as a starting point, CBM cadmium thin-film solar cell technology has been tapped to tap into the development potential of new application markets such as building photovoltaic integration and agricultural photovoltaic integration to establish market competitive advantages. At the same time, we will introduce state-owned enterprises that have the strength to believe that the photovoltaic industry will have a promising future. We will jointly build "two wings": a module production base and the development and operation of various types of photovoltaic power generation applications downstream. In the end, through the “Belt and Road†approach, we have exported our Chinese cadmium telluride thin-film solar cell industrialization technology to the rest of the world and made greater contribution to the sustainable development of human beings.
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