The opto-electronic physics that broke the efficiency limit in solar cells
The opto-electronic physics that broke the efficiency limit in solar cells
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突破太阳能电池效率极限的光电物理
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Kurtz
中科院分区：
文献类型：
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作者：
E. Yablonovitch;O. Miller;S. Kurtz
当太阳能电池接近基本的肖克利-奎瑟极限时，其内部物理特性会发生变化。光子的考虑超过了电子的考虑，因为强烈的内部和外部发光需要仔细的光子管理。与直觉相反，最大化光提取增加了电压，因此提高了效率。直到2010年，一个太阳的单结效率记录是由GaAs太阳能电池创造的，效率为26.4%，开路电压VOC= 1.03 V。阿尔塔器件最近改进了GaAs电池的记录，效率达到28.8%，VOC= 1.12 V，证明了光子管理的重要性。即使使用最好的材料，也无法实现最高的效率，除非太阳能电池也被设计为也是良好的发光二极管（LED）。光提取的物理学将是下一代高效太阳能电池所必需的。
The internal physics of a solar cell changes as it approaches the fundamental Shockley-Queisser limit. Photonic considerations overtake electronic ones, as an intense internal and external luminescence requires careful photon management. Counter-intuitively, maximizing light extraction increases voltage and therefore efficiency. Until 2010 the one-sun, single-junction efficiency record was set by a GaAs solar cell with an efficiency of 26.4% and an open-circuit voltage VOC= 1.03 V. Alta Devices recently improved the record with a GaAs cell that achieved 28.8% efficiency and VOC=1.12V, demonstrating the importance of photon management. Even with the best materials, the highest efficiencies cannot be achieved unless the solar cell is also designed to also be a good light emitting diode (LED). The physics of light extraction will be necessary in the next generation of high-efficiency solar cells.