Module integration of III-V compound semiconductor/silicon two-junction solar cells with three and four terminals

三、四端子III-V族化合物半导体/硅二结太阳能电池模块集成

• 批准号: 329888662
• 负责人: Dr. Henning Schulte-Huxel
• 金额: --
• 依托单位: National Renewable Energy Laboratory (NREL)
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/329888662?language=en
• 关键词: Module; integration; III; compound; semiconductor

Photovoltaic modules with multijunction solar cells convert solar irradiation more efficiently to electrical energy than present modules. In recent years, silicon-based multijunction cells came into the focus of research, since they offer a cost-effective implementation of this technology. The multijunction cells consist of two or more subcells, which are stacked on top of each other. The annually generated energy yield depends on one hand on the properties of the subcells and on the other hand on their interconnection. It is possible to increase the energy yield by up to 20% if the cells are not connected in series, but contacted separately. The latter can be achieved by using tandem cells with three or four terminals. However, there are a lack of adequate interconnection concepts for these solar cells. To close that gap is the aim of this research project.In the first part of the project, the properties of the subcells will be determined experimentally and by devices simulations. On basis of these results, the impact of various illumination conditions, as well as the requirements of the interconnection for different schemes, will be analysed using electrical and optical simulations in order to maximize the cell and module power.The outcome of these analyses will be used in the second part of the project to develop interconnection designs for multijunction solar cells with three and four terminals. It has to be taken into account that, for most applications, photovoltaic modules without concentrating optics are advantageous and that silicon solar cells featuring both contacts on their rear side convert sunlight more efficiently. Therefore, the interconnects have to be designed in such a way that they cover only a small fraction of the illuminated module surface. Further, the interconnection scheme has to be able to contact the two rear contacts of one subcell, as well as one or two of the contacts on the sunny side of the solar cells. To address these requirements, a multilevel metallization will be implemented that is located underneath the solar cells. The applicability of the interconnection scheme will be shown with proof-of-concept modules. These modules are characterized under various illumination conditions in order to verify the simulations of the first part and to show the advantage of the developed interconnection in comparison to multijunction devices with the subcells connected in series. Thus, the aim of this project is to close the gap in the present research and development of new photovoltaic technologies in order to contribute to an increased usage of renewable energies.

具有多结太阳能电池的光伏模块比现有模块更有效地将太阳辐射转化为电能。近年来，硅基多结电池成为研究的焦点，因为它们提供了这种技术的成本效益。多结电池由两个或更多个子电池组成，这些子电池彼此堆叠。每年产生的能量产量一方面取决于子电池的性质，另一方面取决于它们的互连。如果电池不是串联连接，而是单独接触，则可以将能量产量增加高达20%。后者可以通过使用具有三个或四个端子的串联电池来实现。然而，这些太阳能电池缺乏足够的互连概念。缩小这一差距是本研究项目的目标。在项目的第一部分，将通过实验和设备模拟确定子电池的特性。在这些结果的基础上，各种照明条件的影响，以及不同方案的互连要求，将使用电气和光学模拟进行分析，以最大限度地提高电池和模块的功率。这些分析的结果将用于项目的第二部分，开发三个和四个端子的多结太阳能电池的互连设计。必须考虑的是，对于大多数应用，没有聚光光学器件的光伏模块是有利的，并且在其后侧具有两个接触的硅太阳能电池更有效地转换太阳光。因此，互连必须以这样的方式设计，即它们仅覆盖被照射的模块表面的一小部分。此外，互连方案必须能够接触一个子电池的两个后触点，以及太阳能电池的向阳侧上的触点中的一个或两个。为了满足这些要求，将实施位于太阳能电池下方的多层金属化。互联方案的适用性将与概念验证模块一起展示。这些模块的特点是在各种照明条件下，以验证模拟的第一部分，并显示出开发的互连相比，多结器件与串联连接的子电池的优势。因此，该项目的目的是缩小目前新光伏技术研发方面的差距，以促进可再生能源的增加使用。

项目成果

III-V/Si tandem cell to module interconnection - comparison between different operation modes

III-V/Si串联电池到模块互连-不同操作模式之间的比较

• DOI: 10.1109/pvsc.2017.8366558
• 发表时间: 2017
• 作者: Henning Schulte-Huxel;Emily L. Warren;Manuel Schnabel;Paul Stradins;Daniel Friedman;Adele C. Tamboli
• 通讯作者: Adele C. Tamboli