“Photovoltaic power has gradually shifted from a particular area as an important complement to conventional energy sources, and in dispersed form into the electricity market. In the foreseeable future, photovoltaic power generation will partially replace conventional energy.” October 16 Japan, renowned experts in the field of solar cells, Tsinghua University Tsinghua MBA from the bow in the club-sponsored venture capital and innovation of green energy green industry forum said, in recent years, world production of photovoltaic cells and components higher than 30 per year % growth rate, and the main force of future growth will be China.
He pointed out, why do our own production of solar panels themselves do not, however, almost all exports? The reason is that high prices of solar cells.
In the August 26 State Council executive meeting on wind power and new industries such as polysilicon is considered “duplicate construction tendencies.”
”At present, mainstream PV industrial battery products in the polysilicon cell, but the cost is too high.” Bow that, in order to solve the solar photovoltaic industry problem of excessively high costs, and finding ways to improve the photoelectric conversion efficiency and reducing manufacturing costs , then the thin film solar cell technology has become necessary to develop, is also represents the future direction of thin film solar cells, but also requires high efficiency and low cost.
China Energy Network Chief Information Officer HAN Xiao-ping October 20, said in an interview, thin film solar cell by definition is to prepare a film into a solar cell, its volume with little or no silicon, more easily reduce costs, while it is both a kinds of efficient energy products, but also a new type of building material, more easily with the perfect combination of architecture. Silicon raw materials in the international market against the background of continued tension, thin film solar cells has become the international PV market development trends and hot spots.
Although thin film solar cells have already emerged, but a low conversion efficiency, decay rate (light induced degradation rate) was higher and so on, a few years ago did not attract enough attention from the industry, market share is low. With its technological advances in photoelectric conversion efficiency is rapidly increasing, now more than two years ago increased to about 30% -40%, although still in comparison with crystalline silicon cells is still a big gap, but few materials, process simple, low energy consumption, costs have some advantages, more and more accepted by the industry. Therefore, thin film solar cell industry in recent years been rapid development.
Bow that thin film solar cell technology to achieve, it can greatly save the expensive semiconductor material, the same time, thin film battery materials preparation and formation of battery at the same time, thus saving a lot of processes. In addition, low temperature thin film solar cell technology will not only help save energy, and easy to use low-cost substrates (glass, stainless steel, etc.).
”Thin film solar cell uses a very wide range of rapid development, and it also enables the integration and architecture, for example, it used as a building of glass, into the building.” HAN Xiao-ping told the China Times reporter, film Battery greatest benefit is that it does not have to direct sunlight, even without the sun, when it can generate electricity, though not its power generation efficiency when the sun is relatively low, but it can still generate electricity.
HAN Xiao-ping, said, thin film solar cells can also be made directly to the glass greenhouses, greenhouses made of glass that only a small amount of red and orange light through, can promote the growth of plant chlorophyll, not occupied land, and it also to generate electricity.
Investment Advisor in the middle of this year released a report: the 2007 global solar cell production reached 3436MW, compared with an increase of 56% in 2006, Chinese manufacturers in 2007 from the 2006 market share of 20% to 35%, while Japanese firms market share from 39% in 2006 down to 26% market share of Japanese companies fell apart by the upstream silicon material supply tight and the Japanese domestic market, installed capacity of photovoltaic systems and other factors fall outside the distribution under the Japanese vendors generation thin film solar cell development is a significant relationship.
Thin film solar cell production in 2007 continued to exceed the overall industry growth, thin film solar cell production in 2007 reached 400MW, 181MW in 2006, significantly higher than 120% growth in 2007, thin film solar cell market share of 8.2% from 2006 to 2007 upgrade years, 12%, while the 2008 has reached 15% -20%. Thin film solar cell conversion efficiency and large area to further enhance the production cost advantage to play after its market share has further room to improve.
Corresponding to this, following the hot solar modules, polysilicon fever, film photovoltaic cell has become the new investment hot spot areas.
Compared with crystalline silicon cells, thin film cells is much greater potential for cost reduction, driven by rapid technological progress in thin film batteries. Thin-film solar capacity may be the next to reach 20% of the entire solar energy industry, while in 2007 only 7.6%. Thin film solar have to do to improve performance, there are many physical methods, such as ion beam method of nanocrystalline silicon films this process, if domestic enterprises to upgrade some of these methods will be very promising.
According to market research firm released DisplaySearch8 11 solar cell production capacity trend reports, in 2009 thin film solar cell production capacity of about 3.58 million kilowatts. Thin film solar cells in 2005, all solar cell production capacity of about 5% by 2009 is expected to exceed 20%.
Nevertheless, HAN Xiao-ping also told the press to express his concern. He told our reporter, thin film solar cell manufacturing process, will produce a lot of harmful gas, which is easier than conventional gas carbon dioxide increase in Earth’s greenhouse effect, the effect of carbon dioxide may be hundreds even thousands of times.
”In the current situation for China, our production capacity is also weak conductive glass, needs to import large quantities, so the production costs of thin film solar cells will be subject to a certain extent.” However, HAN Xiao-ping that, in general, film solar cell or a direction of technology, because it combines perfectly with the building, the consumption of relatively fewer resources, their cost of production decline there is a great space.
Bow also pointed out that it has not yet large-scale thin film battery production lines, and foreign third-generation solar cell (CIGS CIGS cell) production company does not export technology. He is expected in 2-3 years, China will appear the size of CIGS production. CIGS cells after the speed will quickly increase production in China, will drive China’s PV market.
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