Abstract：
The critical impact of sodium-doped molybdenum (MoNa) in shaping the MoSe2 interfacial layer, influencing the electrical properties of CIGSe/Mo heterostructures, and achieving optimal MoSe2 formation conditions, leading to improved hetero-contact quality. Notably, samples with a 600-nm-thick MoNa layer demonstrate the highest resistivity (73 μΩcm) and sheet resistance (0.45 Ω/square), highlighting the substantial impact of MoNa layer thickness on electrical conductivity. Controlled sodium diffusion through MoNa layers is essential for achieving desirable electrical characteristics, influencing Na diffusion rates, grain sizes, and overall morphology, as elucidated by EDX and FESEM analyses. Additionally, XRD results provide insights into the spontaneous peeling-off phenomenon, with the sample featuring a ~ 600-nm MoNa layer displaying the strongest diffraction peak and the largest crystal size, indicative of enhanced Mo to MoSe2 conversion facilitated by sodium presence. Raman spectra further confirm the presence of MoSe2, with its thickness correlating with MoNa layer thickness. The observed increase in resistance and decrease in conductivity with rising MoSe2 layer thickness underscore the critical importance of optimal MoSe2 formation for transitioning from Schottky to ohmic contact in CIGSe/Mo heterostructures. Ultimately, significant factors to the advancement of CIGSe thin-film solar cell production are discussed, providing nuanced insights into the interplay of MoNa and MoSe2, elucidating their collective impact on the electrical characteristics of CIGSe/Mo heterostructures.
摘要：
钠掺杂的钼（MoNa）在形成MoSe2界面层的关键影响，影响CIGSe/Mo异质结构的电性能，并达到最佳的MoSe2形成条件，提高了异质接触质量。值得注意的是,具有600nm厚的MoNa层的样品显示出最高的电阻率（73μΩcm）和薄层电阻（0.45Ω/平方），强调了MoNa层厚度对电导率的实质性影响。通过MoNa层的受控钠扩散对于实现所需的电特性至关重要，影响Na扩散速率，晶粒尺寸,和整体形态，正如EDX和FESEM分析所阐明的那样。此外,XRD结果提供了对自发剥离现象的见解，样品具有〜600nm的MoNa层，显示出最强的衍射峰和最大的晶体尺寸，表明钠的存在促进了Mo向MoSe2的转化增强。拉曼光谱进一步证实了MoSe2的存在,其厚度与MoNa层厚度相关。随着MoSe2层厚度的增加，观察到的电阻增加和电导率降低，突显了最佳MoSe2形成对于CIGSe/Mo异质结构中从肖特基过渡到欧姆接触的至关重要性。最终,讨论了促进CIGSe薄膜太阳能电池生产的重要因素，提供对MoNa和MoSe2相互作用的细致入微的见解，阐明它们对CIGSe/Mo异质结构的电特性的集体影响。
