Engineering CIGS grains qualities to achieve high efficiency in ultrathin Cu(InxGa1-x)Se-2 solar cells with a single-gradient band gap profile
Engineering CIGS grains qualities to achieve high efficiency in ultrathin Cu(InxGa1-x)Se-2 solar cells with a single-gradient band gap profile
复制标题
设计 CIGS 晶粒质量，以实现具有单梯度带隙分布的超薄 Cu(InxGa1-x)Se-2 太阳能电池的高效率
作者：
Li Hui;Qu Fei;Luo Haitian;Niu Xiaona;Chen Jingwei;Zhang Yi;Yao Huijun;Jia Xiaojie;Gu Hongwei;Wang Wenjing
减小Cu（InxGa 1-x）Se-2（CIGS）的厚度是减少材料使用和提高制造产量的有效方法。然而，在CIGS太阳能电池中获得高效率仍然是一个挑战。在此，通过三阶段共蒸发方法合成具有1.3 μ m厚度的CIGS太阳能电池。通过电容电压、电容频率、二次离子质谱、X射线荧光、透射电子显微镜和电子束感生电流等技术对CIGS太阳能电池进行了表征。通过优化晶粒尺寸、界面质量和Ga梯度，在不使用任何陷光和减反射涂层技术的情况下，CIGS太阳能电池的最高效率达到11.72%。与厚度为2.3 μ m的典型CIGS太阳能电池相比，由于形成了背电场，所以CIGS太阳能电池显示出更高的开路电压。晶界有利于载流子的分离和输运。CIGS太阳电池具有良好的抗离子轰击能力，在空间器件中具有潜在的应用前景。我们的研究结果提供了一种策略，以实现高效率的CIGS太阳能电池。
Reducing the Cu(InxGa1-x)Se-2 (CIGS) thickness is an effective way to reduce the material use and increase manufacturing throughput. However, it is still a challenge to obtain high efficiency in the ultrathin CIGS solar cell. Here, the CIGS solar cell with a 1.3 mu m-thickness-CIGS was synthesized via a three-stage co-evaporation method. The obtained CIGS solar cells were characterized by capacitance-voltage, capacitance-frequency, secondary ion mass spectrometry, X-ray fluorescence, transmission electron microscope, and electron beam induced current techniques. By optimizing the grain size, interface quality, and the Ga gradient in the ultrathin CIGS solar cell, the highest efficiency reached to 11.72% without any light trapping and anti-reflecting coating techniques. Compared with the typical CIGS solar cell with a thickness of 2.3 mu m, the ultrathin CIGS solar cell showed a higher open-circuit voltage due to formation a back electrical field. The grain boundaries were found to be beneficial to the carrier's separation and transport. The ultrathin CIGS solar cell had good ability to resist ion bombardment, suggesting its potential application in the space devices. Our results provide a strategy to achieve high-efficiency ultrathin CIGS solar cells.