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首页> 外文期刊>Applied Surface Science >Combined embedding of N-doping and CaCO_3 surface modification in the TiO_2 photoelectrodes for dye-sensitized solar cells
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Combined embedding of N-doping and CaCO_3 surface modification in the TiO_2 photoelectrodes for dye-sensitized solar cells

机译：N掺杂和CaCO_3表面修饰在染料敏化太阳能电池TiO_2光电极中的联合嵌入

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摘要

A successive embedding of N-doping and CaCO_3 surface modification was carried out in the TiO_2 photo-electrodes for dye-sensitized solar cells (DSSCs). The combined effect was revealed with the great increase of the open-circuit voltage (V_(oc)), short-circuit current (J_(sc)), and photoelectric conversion efficiency (η) of the prepared cells; the efficiency (η) was improved from 5.42% of a commercial TiO_2 photoelectrode to 7.47% of an unmodified N-doped electrode, and to 9.03% of a N-doped and CaCO_3 surface modified electrode. An enhanced photoresponse in N-doped TiO_2 nanoparticles generate more photo-excited electrons in adsorbed dye, as supported by measured UV-vis diffuse reflectance spectra and incident photon to current conversion efficiency (IPCE). A successive CaCO_3 surface modification then form a barrier on the surface of N-doped TiO_2 particles, suppressing charge recombination of photo-generated electrons from N-doped TiO_2 to dye or electrolyte, and thus extending their life time in the electrode, as supported by electron impedance spectroscopy (EIS). Furthermore, the higher basicity of the CaCO_3 modified HO_2 facilitates the dye adsorption, as supported by the direct measurement of the amount of adsorbed dye.
机译：在染料敏化太阳能电池（DSSC）的TiO_2光电极中进行了N掺杂和CaCO_3表面修饰的连续嵌入。所制备电池的开路电压（V_（oc）），短路电流（J_（sc））和光电转换效率（η）的大幅提高显示出综合效果。效率（η）从商用TiO_2光电极的5.42％提高到未修饰的N掺杂电极的7.47％，以及N掺杂的CaCO_3表面修饰电极的9.03％。 N掺杂的TiO_2纳米颗粒中增强的光响应在吸附的染料中产生更多的光激发电子，这由测得的UV-vis漫反射光谱和入射光子至电流转换效率（IPCE）所支持。然后，连续的CaCO_3表面改性会在N掺杂的TiO_2颗粒的表面上形成势垒，从而抑制了N掺杂的TiO_2产生的光生电子的电荷重组，从而延长了它们在电极中的寿命，这受到了电子阻抗谱（EIS）。此外，如直接测量吸附的染料量所支持的，CaCO_3改性的HO_2的较高碱度有助于染料吸附。

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