Core–shell α-Fe2O3-mixed phase TiO2 nanocubes as a highway for electron transport with efficient energy harvesting,Molecular Systems Design & Engineering

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Core–shell α-Fe2O3-mixed phase TiO2 nanocubes as a highway for electron transport with efficient energy harvesting
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2020-02-18 , DOI: 10.1039/c9me00157c
Kiran P. Shejale _{1,

2,

3,

4,

5} , Sumit Saxena _{1,

2,

3,

4,

5} , Shobha Shukla _{1,

2,

3,

4,

5}

Affiliation

Morphology (shape + phase) driven nanoassemblies are emerging materials for faster charge transport and have immense potential for the development of photoelectric devices. α-Fe₂O₃ (core) nanocubes are synthesized via a facile modified metal-ion mediated hydrothermal method. Mixed-phase (anatase and rutile) TiO₂ thin conformal nanoshells (∼15 nm) are decorated on the core by a kinetically controlled process. A high yield (96.37%) of highly monodisperse core–shell α-Fe₂O₃–anatase + rutile TiO₂ nanocubes is obtained. Their phase and detailed crystallographic nature are investigated using XRD and SEM-TEM, respectively. Furthermore, a dye sensitized solar cell (DSSC) is fabricated using the synthesized materials as a photoanode. The device fabricated using core–shell nanostructures as photoanodes demonstrated an 8% and 21% enhancement in the photoconversion efficiency and FF of the solar cell compared to that of α-Fe₂O₃ photoanodes, respectively. Our results suggest that dye molecules are anchored to the α-Fe₂O₃–anatase + rutile TiO₂ nanocubes more effectively, providing direct pathways for electron (e⁻) transport and a lower recombination rate (V_OC increase by 5%). This study opens a new facile approach for diverse phase dependent core–shell nanocube architecture for a wide range of applications.

中文翻译：

核-壳α-Fe2O3混合相TiO2纳米立方体作为有效传输能量的电子传输途径

形态（形状+相）驱动的纳米组件是新兴的材料，可以更快地进行电荷传输，并具有开发光电器件的巨大潜力。的α-Fe ₂ ö ₃（核心）纳米立方体合成经由一个浅显改性的金属离子介导的水热法。混合相（锐钛矿和金红石型）TiO ₂薄形共形纳米壳（约15 nm）通过动力学控制的方法修饰在芯上。高度单分散的芯-壳的高产率（96.37％）的α-Fe ₂ ö ₃ -anatase +金红石型二氧化钛₂获得纳米立方体。分别使用XRD和SEM-TEM研究了它们的相和详细的晶体学性质。此外，使用合成的材料作为光阳极制造了染料敏化太阳能电池（DSSC）。使用核-壳纳米结构的装置制造为光阳极表现出在太阳能电池的光转换效率和FF的8％和21％的增强相比的α-Fe的₂ ö ₃光阳极，分别。我们的研究结果表明，染料分子被锚定到的α-Fe ₂ ö ₃ -anatase +金红石型二氧化钛₂纳米立方体更有效，提供直接途径电子（E ^-）传输和下重组率（V_OC增加5％）。这项研究为各种依赖于相位的核-壳纳米立方体体系结构为广泛的应用提供了一种新的简便方法。

更新日期：2020-02-18

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