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首页> 外文会议>European Photovoltaic Solar Energy Conference and Exhibition >DEMONSTRATION OF THIN SILICON SOLAR CELLS WITH SELF-ASSEMBLED DIFFRACTIVE HONEYCOMB LIGHT-TRAPPING STRUCTURES
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DEMONSTRATION OF THIN SILICON SOLAR CELLS WITH SELF-ASSEMBLED DIFFRACTIVE HONEYCOMB LIGHT-TRAPPING STRUCTURES

机译：具有自组装扩散蜂窝光陷阱结构的薄硅太阳能电池的演示

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Over the last years, the cost of solar electricity has been reduced at an exceptional rate. Already, solar electricity is the cheapest source of electricity in several sunny parts of the world. However, solar electricity prices must be reduced further to be competitive with base load electricity prices in major markets such as the EU, the US and China. One way of reducing both the price and environmental footprint of solar electricity produced by crystalline silicon solar cells is to reduce the thickness of the solar cell and, thereby, the consumption of high purity silicon. Today, the thickness of a conventional wafer-based solar cell today is about 150 - 200 μm. It is possible to reduce the thickness down to a few tens of microns without compromising efficiency, as long as efficient light absorption in the silicon wafer can be ensured. Diffractive structures can provide the necessary light trapping. Such structures consume little of the absorber material and are therefore suitable for use in very thin solar cells. In addition they can be tuned to provide good light trapping in a specific wavelength region. In this work, we report on our development of a method to create a diffractive light trapping texture consisting of dimples in an ordered, hexagonal pattern. We have chosen a periodicity that has been shown in simulations to be advantageous for trapping light close the silicon band gap, where the absorption length is many times the thickness of the solar cell. We thereafter fabricated complete solar cells with thicknesses of 50, 100 and 300 μm with light trapping structures and measured and compared the resulting quantum efficiency with that of planar reference solar cells. The results show that the diffractive structures enable an improvement in quantum efficiency of more than 35 % in the low energy part of the solar spectrum compared to their planar counterparts.
机译：在过去的几年中，太阳能的成本已经以惊人的速度降低了。在世界上几个晴天，太阳能已经是最便宜的电力来源。但是，必须进一步降低太阳能价格，才能与欧盟，美国和中国等主要市场的基本负荷电价竞争。降低由晶体硅太阳能电池产生的太阳能的价格和环境足迹的一种方法是减小太阳能电池的厚度，从而减小高纯度硅的消耗。今天，今天常规的基于晶片的太阳能电池的厚度约为150-200μm。只要可以确保硅晶片中有效的光吸收，就可以将厚度减小到几十微米而不会影响效率。衍射结构可以提供必要的光捕获。这样的结构消耗很少的吸收剂材料，因此适合用于非常薄的太阳能电池中。另外，它们可以被调谐以在特定的波长区域中提供良好的光捕获。在这项工作中，我们报告了一种方法的开发，该方法用于创建由有序六边形图案中的凹坑组成的衍射光捕获纹理。我们选择了在模拟中已显示出的周期，该周期对于在硅带隙附近捕获光是有利的，在该硅带隙中，吸收长度是太阳能电池厚度的许多倍。此后，我们制造了具有光捕获结构的厚度分别为50、100和300μm的完整太阳能电池，并测量了所得的量子效率并将其与平面参考太阳能电池的量子效率进行了比较。结果表明，与平面结构相比，衍射结构在太阳光谱的低能部分能使量子效率提高35％以上。

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