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    • 2. 发明授权
    • Silicon cells made by self-aligned selective-emitter plasma-etchback
process
    • 通过自对准选择发射体等离子体回蚀法制造的硅电池
    • US6091021A
    • 2000-07-18
    • US191319
    • 1998-11-13
    • Douglas S. RubyWilliam K. SchubertJames M. GeeSaleem H. Zaidi
    • Douglas S. RubyWilliam K. SchubertJames M. GeeSaleem H. Zaidi
    • H01L31/0216H01L31/068H01L31/18H01L31/00
    • H01L31/02167H01L31/02168H01L31/068H01L31/1804H01L31/186Y02E10/547Y02P70/521
    • Photovoltaic cells and methods for making them are disclosed wherein the metallized grids of the cells are used to mask portions of cell emitter regions to allow selective etching of phosphorus-doped emitter regions. The preferred etchant is SF.sub.6 or a combination of SF.sub.6 and O.sub.2. This self-aligned selective etching allows for enhanced blue response (versus cells with uniform heavy doping of the emitter) while preserving heavier doping in the region beneath the gridlines needed for low contact resistance. Embodiments are disclosed for making cells with or without textured surfaces. Optional steps include plasma hydrogenation and PECVD nitride deposition, each of which are suited to customized applications for requirements of given cells to be manufactured. The techniques disclosed could replace expensive and difficult alignment methodologies used to obtain selectively etched emitters, and they may be easily integrated with existing plasma processing methods and techniques of the invention may be accomplished in a single plasma-processing chamber.
    • 公开了光伏电池及其制造方法,其中使用电池的金属化网格来掩蔽电池发射极区域的部分,以允许选择性地蚀刻磷掺杂的发射极区域。 优选的蚀刻剂是SF 6或SF 6和O 2的组合。 这种自对准选择性蚀刻允许增强的蓝色响应(相对于具有均匀的重掺杂发射体的单元),同时在低接触电阻所需的网格线下方的区域中保持较重的掺杂。 公开了用于制造具有或不具有纹理表面的单元的实施例。 可选步骤包括等离子体氢化和PECVD氮化物沉积,其中每一种适合于要制造的给定电池的要求的定制应用。 所公开的技术可以代替用于获得选择性蚀刻的发射体的昂贵和困难的对准方法,并且它们可以容易地与现有等离子体处理方法集成,并且本发明的技术可以在单个等离子体处理室中实现。
    • 5. 发明授权
    • Metal catalyst technique for texturing silicon solar cells
    • 用于纹理硅太阳能电池的金属催化剂技术
    • US06329296B1
    • 2001-12-11
    • US09634905
    • 2000-08-09
    • Douglas S. RubySaleem H. Zaidi
    • Douglas S. RubySaleem H. Zaidi
    • H01L2100
    • H01L21/31111H01L31/02363Y02E10/50
    • Textured silicon solar cells and techniques for their manufacture utilizing metal sources to catalyze formation of randomly distributed surface features such as nanoscale pyramidal and columnar structures. These structures include dimensions smaller than the wavelength of incident light, thereby resulting in a highly effective anti-reflective surface. According to the invention, metal sources present in a reactive ion etching chamber permit impurities (e.g. metal particles) to be introduced into a reactive ion etch plasma resulting in deposition of micro-masks on the surface of a substrate to be etched. Separate embodiments are disclosed including one in which the metal source includes one or more metal-coated substrates strategically positioned relative to the surface to be textured, and another in which the walls of the reaction chamber are pre-conditioned with a thin coating of metal catalyst material.
    • 纹理硅太阳能电池及其制造技术利用金属源催化随机分布的表面特征如纳米锥体和柱状结构的形成。 这些结构的尺寸小于入射光的波长,从而形成高度有效的抗反射表面。 根据本发明,存在于反应离子蚀刻室中的金属源允许将杂质(例如金属颗粒)引入到反应离子蚀刻等离子体中,导致微掩模沉积在待蚀刻的基底的表面上。 公开了单独的实施例,包括其中金属源包括相对于要织构的表面有策略地定位的一个或多个金属涂覆的基底的另一个,其中反应室的壁用金属催化剂的薄涂层进行预处理 材料。