Potassium Treatments for Solution-Processed Cu(In,Ga)(S,Se) 2 Solar Cells
Potassium Treatments for Solution-Processed Cu(In,Ga)(S,Se) 2 Solar Cells
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溶液处理 Cu(In,Ga)(S,Se) 2 太阳能电池的钾处理
DOI：
10.1021/acsaem.0c00422
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发表时间：
2020
影响因子：
6.4
通讯作者：
Agrawal, Rakesh
中科院分区：
文献类型：
--
作者：
Alruqobah, Essam H.;Agrawal, Rakesh
Cu（In，Ga）（S，Se）2（CIGSe，CIGSSe）因其高光吸收系数和可调带隙而成为一种有吸引力的薄膜太阳能电池吸收材料。在CIGSSe加工和制造中，已经实施了碱处理的使用，因为钠掺杂被认为是获得高效率CIGSSe太阳能电池器件的要求，并且已经被广泛使用。近年来更重要的发展之一是发现了钾后沉积处理对真空处理的CIGSSe太阳能电池的有益影响，因为它们是CIGSSe太阳能电池性能大幅提高的原因。在这里，我们进行了一项研究钾处理的影响，从胶体硫化物为基础的纳米粒子油墨生长的溶液处理CIGSSe薄膜。通过添加钾通过电子束蒸发氟化钾（KF）硒化和晶粒生长之前，我们发现，CIGSSe的晶粒生长增强与钾的添加和一个较大的晶粒的膜结果相比，未经处理的硒化CIGSSe膜，类似于钠处理的膜中观察到的。我们还观察到，通过X射线光电子能谱（XPS），与K处理的薄膜显示的高带隙K-In-Se表面相的存在。在制备器件时，我们发现同时进行钠和钾处理的薄膜具有增强的光电性能，主要表现在更高的开路电压和更高的短路电流。
Cu(In,Ga)(S,Se)2(CIGSe, CIGSSe) has emerged as an attractive thin-film solar cell absorber material owing to its high light absorption coefficient and tunable bandgap. In CIGSSe processing and fabrication, the use of alkali treatments has been implemented as sodium doping is considered a requirement for obtaining high-efficiency CIGSSe solar cell devices and has been used extensively. One of the more significant developments in recent years has been the discovery of the beneficial effects that potassium post-deposition treatments have on vacuum-processed CIGSSe solar cells as they are responsible for a major increase in CIGSSe solar cell performance. Here, we conduct a study of the effect of potassium treatments on solution-processed CIGSSe films grown from colloidal sulfide-based nanoparticle inks. By adding potassium through e-beam evaporation of potassium fluoride (KF) prior to selenization and grain growth, we find that the grain growth of CIGSSe is enhanced with potassium addition and that a larger-grained film results compared to the untreated selenized CIGSSe film, similar to that observed in sodium-treated films. We also observe through X-ray photoelectron spectroscopy (XPS) that films treated with K show the presence of the high-bandgap K–In–Se surface phase. Upon fabricating the devices, we find that films that have been subjected simultaneously to both sodium and potassium treatments have enhanced optoelectronic performance, mainly manifested in the higher open-circuit voltage and higher short-circuit current.