高效率和低白银成本 - 矛盾？总部位于德国太阳能研究所Hamelin（ISFH）的测试表明，这不是。该研究所印刷并测试了高效太阳能电池（ETA：20.2％），银色的成本低于每wp的0.01美元，用于使用Heraeus糊的前侧金属化。该单元格是一种钝化的发射极和后池（PERC），并使用双打印技术打印前侧网格。
Producing higher efficiency solar cells at a lower cost per Wp, that's the current objective and challenge of cell manufacturers. Metallization pastes for c-Si solar cells contain silver, due to this precious metal's excellent electrical, mechanical properties and performance in both cells and modules. However, silver is a costly material with a volatile price. New cell technologies and printing techniques help to reduce the amount of paste and thus the amount of silver required.
The tested, low silver cell from the ISFH combines PERC cell technology and Dual Printing. PERC cells feature a passivation layer on the back-side. Insulating the back-side helps gain higher VOC and JSC values and thus higher efficiencies. In Dual Print, a conventional firing-through front-side paste for the finger lines and a low activity paste for the floating busbars are printed using two separate steps. For the ISFH project, Heraeus' SOL9610 Series was applied as finger paste in stencil printing. The floating busbars were screen printed using SOL325A. SOL325A, as a low activity paste (also called non contacting paste), does not penetrate the passivation layer in order to connect to the emitter. SOL325A also features a lower silver content than the finger paste, which helps to reduce silver cost.
How can front-side metallization, with a silver cost of below 0.01 $ per Wp be achieved? Less than 70 mg of Ag metallization paste containing less than 55 mg of pure silver was required for printing both finger lines and busbars. With a performance of 4.82 Wp per cell and assuming a silver price of 670 $/kg, we calculate a silver cost for front-side metallization of less than 0.01 $ per Wp. Demonstrating a cell efficiency of 20.2% shows that you don't need to sacrifice performance for a low silver usage and cost.
Low silver metallization cost will be a major topic at the Heraeus Photovoltaics Business Unit booth at this year's EU PVSEC exhibition, to be held in Paris from October 1-3 (EU PVSEC Conference: September 30 – October 4). To discuss this topic with our experts and to learn more about Heraeus' metallization pastes, visit us at EU PVSEC trade show in Paris, Parc des Expositions Paris Nord Villepinte, in hall 2, booth number 2/C3 or go towww.pvsilverpaste.com.
Heraeus光伏业务部门
The Heraeus Photovoltaics Business Unit is an industry leading developer and manufacturer of silver metallization pastes for the photovoltaic industry. For over 40 years, Heraeus has built a reputation of innovation, extensive research and new product development in thick film technologies for some of the most prominent companies within a variety of industries. In the field of photovoltaics, the Heraeus Photovoltaics Business Unit applies this history and its innovative technology to offer metallization pastes for solar cell applications. The Heraeus SOL Series of silver pastes is specially formulated to provide higher efficiencies and wider processing windows, resulting in better yields and higher output for cell manufacturers.
来源：http://www.pvsilverpaste.com