A comparative study of the density of surface states in solid and hollow TiO2 microspheres†,Inorganic Chemistry Frontiers

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A comparative study of the density of surface states in solid and hollow TiO2 microspheres†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-07-26 00:00:00 , DOI: 10.1039/c8qi00633d
Chun Gao _{1,

2,

3,

4,

5} , Yu-Qi Peng _{1,

2,

3,

4,

5} , Lin-Hua Hu _{1,

2,

3,

4,

5} , Li-E Mo _{1,

2,

3,

4,

5} , Xian-Xi Zhang _{6,

7,

8,

9} , Tasawar Hayat _{10,

11,

12,

13,

14} , Ahmed Alsaedi _{10,

11,

12,

13,

14} , Song-Yuan Dai _{1,

2,

3,

4,

5}

Affiliation

As a crucial photoelectric material, TiO₂ microspheres have been widely applied as photoanodes in photovoltaic devices owing to their large surface area, suitable pore size and prominent scattering effect. However, surface states in the TiO₂ films playing a significant role in the charge transport process are an important factor influencing the photovoltaic performance. Herein, solid and hollow TiO₂ microspheres were compared to investigate the influence of the density and distribution of surface states. The density and distribution of surface states, charge recombination process and band edge shifts were investigated. The results showed that the density of surface states of the TiO₂ microspheres decreased after recrystallization, leading to a suppressed charge recombination rate. Moreover, owing to the hollow architecture, recrystallized hollow microspheres (rHM) have higher photon utilization. As a result, a photoelectric conversion efficiency of dye-sensitized solar cells based on the rHM up to 10.57% was obtained.

中文翻译：

固体和空心TiO ₂微球表面态密度的比较研究†

TiO ₂微球作为一种重要的光电材料，由于其较大的表面积，合适的孔径和突出的散射效果，已被广泛用作光伏器件中的光阳极。然而，TiO ₂膜中的表面态在电荷传输过程中起着重要作用，是影响光伏性能的重要因素。在本文中，比较了固态和空心TiO ₂微球，以研究密度和表面态分布的影响。研究了表面态的密度和分布，电荷复合过程以及能带边缘位移。结果表明，TiO ₂的表面态密度大。重结晶后微球减少，导致电荷复合率降低。此外，由于中空结构，重结晶的中空微球（rHM）具有更高的光子利用率。结果，获得了基于rHM的高达10.57％的染料敏化太阳能电池的光电转换效率。

更新日期：2018-07-26

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