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New laser-based approaches to improve the passivation and rear contact quality in high efficiency crystalline silicon solar cells

机译:基于新的激光方法,提高高效晶体硅太阳能电池中的钝化和后触点质量

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Laser processing has been the tool of choice last years to develop improved concepts in contact formation for high efficiency crystalline silicon (c-Si) solar cells. New concepts based on standard laser fired contacts (LFC) or advanced laser doping (LD) techniques are optimal solutions for both the front and back contacts of a number of structures with growing interest in the c-Si PV industry. Nowadays, substantial efforts are underway to optimize these processes in order to be applied industrially in high efficiency concepts. However a critical issue in these devices is that, most of them, demand a very low thermal input during the fabrication sequence and a minimal damage of the structure during the laser irradiation process. Keeping these two objectives in mind, in this work we discuss the possibility of using laser-based processes to contact the rear side of silicon heterojunction (SHJ) solar cells in an approach fully compatible with the low temperature processing associated to these devices. First we discuss the possibility of using standard LFC techniques in the fabrication of SHJ cells on p-type substrates, studying in detail the effect of the laser wavelength on the contact quality. Secondly, we present an alternative strategy bearing in mind that a real challenge in the rear contact formation is to reduce the damage induced by the laser irradiation. This new approach is based on local laser doping techniques previously developed by our groups, to contact the rear side of p-type c-Si solar cells by means of laser processing before rear metallization of dielectric stacks containing A1_2O_3. In this work we demonstrate the possibility of using this new approach in SHJ cells with a distinct advantage over other standard LFC techniques.
机译:激光加工是持续时间选择的工具,在高效晶体硅(C-Si)太阳能电池中开发改进的接触形成概念。基于标准激光触点(LFC)或高级激光掺杂(LD)技术的新概念是许多结构的前后触点以及在C-Si PV工业兴趣日益增长的最佳解决方案。如今,正在进行大量努力来优化这些过程,以便在工业上以高效概念应用。然而,这些装置中的一个关键问题是,大多数情况下,在制造序列期间需要非常低的热输入和在激光照射过程中的结构的最小损坏。在这项工作中保持这两个目标,我们讨论了使用基于激光的过程与与这些装置相关联的低温处理完全兼容的方法中使用基于激光的过程的可能性与硅异质结(SHJ)太阳能电池的后侧接触。首先,我们讨论使用标准LFC技术在P型衬底上制造SHJ细胞的可能性,详细研究激光波长对接触质量的影响。其次,我们提出了一种替代策略,记住,后触点形成的真正挑战是减少激光照射引起的损伤。这种新方法基于先前由我们的组开发的本地激光掺杂技术,通过在包含A1_2O_3的介电叠层的后金属化之前通过激光加工接触P型C-Si太阳能电池的后侧。在这项工作中,我们展示了在SHJ细胞中使用这种新方法的可能性,在其他标准的LFC技术中具有明显的优势。

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