Neykova Neda, Stuchlik Jiri, Hruska Karel, Poruba Ales, Remes Zdenek, Pop-Georgievski Ognen
Institute of Physics AS CR v.v.i., Cukrovarnicka 10, 162 53 Prague, Czech Republic.
Institute of Macromolecular Chemistry AS CR v.v.i., Heyrovsky sq. 2, 162 06 Prague, Czech Republic.
Beilstein J Nanotechnol. 2017 Feb 16;8:446-451. doi: 10.3762/bjnano.8.48. eCollection 2017.
Densely packed ZnO nanocolumns (NCs), perpendicularly oriented to the fused-silica substrates were directly grown under hydrothermal conditions at 90 °C, with a growth rate of around 0.2 μm/h. The morphology of the nanostructures was visualized and analyzed by scanning electron microscopy (SEM). The surface properties of ZnO NCs and the binding state of present elements were investigated before and after different plasma treatments, typically used in plasma-enhanced CVD solar cell deposition processes, by X-ray photoelectron spectroscopy (XPS). Photothermal deflection spectroscopy (PDS) was used to investigate the optical and photoelectrical characteristics of the ZnO NCs, and the changes induced to the absorptance by the plasma treatments. A strong impact of hydrogen plasma treatment on the free-carrier and defect absorption of ZnO NCs has been directly detected in the PDS spectra. Although oxygen plasma treatment was proven to be more efficient in the surface activation of the ZnO NC, the PDS analysis showed that the plasma treatment left the optical and photoelectrical features of the ZnO NCs intact. Thus, it was proven that the selected oxygen plasma treatment can be of great benefit for the development of thin film solar cells based on ZnO NCs.
在90℃水热条件下直接生长出垂直于熔融石英衬底的密集排列的ZnO纳米柱（NCs），生长速率约为0.2μm/h。通过扫描电子显微镜（SEM）对纳米结构的形态进行了观察和分析。通过X射线光电子能谱（XPS）研究了在等离子体增强CVD太阳能电池沉积过程中常用的不同等离子体处理前后ZnO NCs的表面性质和当前元素的结合状态。光热偏转光谱（PDS）用于研究ZnO NCs的光学和光电特性，以及等离子体处理对吸收率的影响。在PDS光谱中直接检测到氢等离子体处理对ZnO NCs的自由载流子和缺陷吸收有强烈影响。尽管已证明氧等离子体处理在ZnO NC的表面活化方面更有效，但PDS分析表明，等离子体处理使ZnO NCs的光学和光电特性保持不变。因此，已证明所选的氧等离子体处理对基于ZnO NCs的薄膜太阳能电池的开发可能非常有益。
