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首页> 外文期刊>Optical and quantum electronics >Physical properties of anatase TiO_2 nanocrystallites: based photoanodes doped with Cr_2O_3
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Physical properties of anatase TiO_2 nanocrystallites: based photoanodes doped with Cr_2O_3

机译：锐钛矿型TiO_2纳米晶体的物理性质：Cr_2O_3掺杂的光阳极

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摘要

In this paper the effect of doping based-TiO_2 nanocrystallites photoanodes with chromium oxide (Cr_2O_3) has been studied. Photoanodes of dye-sensitized solar cells (DSSCs) were synthesized with the composition TiO_2-(Cr_2O_3)_x where 0≤x≤0.5 wt% by the conventional solid-state reaction method. The crystal structure and optical properties of photoanodes were analyzed by XRD, SEM, EDX and UV-visible spectroscopy techniques. The photovoltaic characteristics for the prepared samples have been studied by employing J-V measurements. X-ray diffraction study showed that the dominating phase in the samples is the anatase tetragonal phase with space group I4_1/amd. Another rhombohedral phase of Cr_2O_3 was observed in doped samples and found to increase with increasing of Cr_2O_3 content. A reduction in particle size with increasing of the dopant content was reported and attributed to crystallites growth suppression due to the presence of Cr~(3+) at the grain boundary. The UV-visible spectroscopy absorption improved by increasing Cr_2O_3 content in doped samples which may be recognized by presence of novel electronics states in band gap of TiO_2. Data obtained from the UV-visible spectroscopy measurements reflects a decrease in the optical energy gap (E~(optlcal)) and an increase in optical refractive index with increasing of the dopant. J-V photovoltaic characteristics confirms that the DSSC_s photoanodes doped with Cr_2O_3 have higher value for conversion efficiency (η), fill factor, and short circuit current density (J_(sc)) compared with sample without doping.
机译：本文研究了用氧化铬（Cr_2O_3）掺杂TiO_2纳米微晶光阳极的效果。通过常规的固态反应方法合成了组成为TiO_2-（Cr_2O_3）_x其中0≤x≤0.5wt％的染料敏化太阳能电池（DSSC）的光阳极。用XRD，SEM，EDX和紫外可见光谱技术分析了光阳极的晶体结构和光学性能。通过采用J-V测量，已经研究了所制备样品的光伏特性。 X射线衍射研究表明，样品中的主要相为锐钛矿四方相，空间群为I4_1 / amd。在掺杂样品中观察到另一种菱形的Cr_2O_3相，并随Cr_2O_3含量的增加而增加。据报道，随着掺杂剂含量的增加，粒径减小，这归因于晶粒边界处Cr〜（3+）的存在，从而抑制了晶粒的生长。通过增加掺杂样品中Cr_2O_3的含量可以改善紫外可见光谱的吸收，这可以通过TiO_2带隙中存在新的电子态来识别。从紫外可见光谱测量获得的数据反映出光能隙的减小（E〜（光学））和光折射率随掺杂剂的增加而增加。 J-V光伏特性证实，与未掺杂样品相比，掺杂Cr_2O_3的DSSC_s光电阳极具有更高的转换效率（η），填充系数和短路电流密度（J_（sc））值。

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