Multi-junction solar cell efficiency to 41.1%

Figure I, Ga0.35In0.65P/Ga0.83In0.17As/Ge multi-junction solar cell, an area of 5.09mm?

So efficient multi-junction solar cell is mainly used to focus on photovoltaic systems (concentratingphotovoltaic, referred to as CPV), direct conversion of sunlight for solar power source throughout the town. Will focus sunlight on a small (5mm?) Multi-junction solar cells, in solar energy equivalent to 454 can achieve 41.1% conversion efficiency, even in the higher energy 880 remains under the suns radiation 40.4% can be measured, the battery can be a wide use of sunlight intensity, and SN74LVC2G32DCUR datasheet and with more than 40% conversion efficiency. FhG-ISE

like before the battery, the battery still use the new extension of the three-junction structure deformation, lattice mismatch Ga0.35In0.65P/Ga0.83In0.17As/Ge (indium gallium phosphide and SN74LVC2G32DCUR price and arsenic indium gallium deposited on Ge) layer structure. Compared with conventional solar cells, separation of the semiconductor material and SN74LVC2G32DCUR suppliers and there are no same lattice constant, we can only use the extension to combine the two layers of distortion, it is difficult to obtain high quality film, the other because of different between the two materials The lattice constant, combined prone to stress, resulting inserted row or other lattice defects.

By Frank Dr (FrankDimroth) led group III-V Epitaxy and Solar Cells group, FhG-ISE to overcome the above difficulties and deficiencies limited to the electronic non-active zone, while the active area is relatively defect-free reservations, which To achieve high conversion efficiency is an indispensable factor. "This is a good example and tell us how to use technological breakthroughs to control the crystallization of the semiconductor defects" FraunhoferISE Ike Dean Weber (EickeR.Weber) Dr. mentioned. Multi-junction solar cell

deformation of extension can be used in a variety of III-V compound semiconductors, the high efficiency of the battery structure formed by the appropriate materials can be divided into three bands of sunlight were to absorb. Researchers suggest that this is an important conclusion is that using a series of material connected to form the solar cell, its components will be the current minimum current that part to the limitations of the use of deformed extension of the battery Ga0.35In0.65P / Ga0.83In0.17As/Ge, can make the current matching, the complete output (multi-junction cell structure are produced close to three times the current of the battery), this is the battery can achieve high conversion efficiency of the important reasons.

Figure II, filled with constant, constant focus on efficiency and solar mapping (data measured by the FraunhoferISECalLab) Last year, the conversion efficiency

FraunhoferISE increase from the 37.6% to 39.7% by adjusting the front-end structure of the metal thin wire has a low contact resistance can pass a larger current, more suitable for concentrated solar constant of 300 ~ 600. Frank mentioned that the latest change in front of the metal thin battery is the graphics, and has a better quality film. In order for the technology and existing technology as a competitive, fast and feasible, FraunhoferISE and Germany Heilbronn (Heilbronn) of AzurSpace collaboration and technology transfer, also in Freiburg ConcentrixSolarGmbH. "And the other focusing photovoltaic systems, our high efficiency solar cells is the most efficient way to reduce the cost of electricity" FraunhoferISEs director, Dr. Andrew Bate (AndreasBett) mentioned. FraunhoferISE With the new battery to the goal of high conversion efficiency, a major step forward, and soon, the cost of photovoltaic power generation can compete with traditional power. Dr. Frank

by changing the cell structure will help to make this type of battery has a long-term advantage, and to improve efficiency to 42 ~ 43%. Researchers over the past 15 years FraunhoferISE group dedicated to III-V multi-junction solar cell used in photovoltaic systems research focus from the beginning of the German Federal Ministry of Education (GermanFederalMinistryofEducationandResearch, referred to as the BMBF) for support, and now also the German Federal Environmental, Department of Conservation cum nuclear safety, wisdom, energy policy bureau (GermanFederalMinistryfortheEnvironment, NatureConservationandNuclearSafety, referred to as the BMU) to provide financial aid, scholarships for doctoral students, the future will be faster and better results to share with the world.