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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Improved Electron Transfer between TiO2 and FTO Interface by N-Doped Anatase TiO2 Nanowires and Its Applications in Quantum Dot-Sensitized Solar Cells
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Improved Electron Transfer between TiO2 and FTO Interface by N-Doped Anatase TiO2 Nanowires and Its Applications in Quantum Dot-Sensitized Solar Cells

机译：通过N掺杂的锐钛矿TiO2纳米线改善TiO2和FTO界面之间的电子传递及其在量子点敏化太阳能电池中的应用

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摘要

The growth of anatase TiO2 nanowires (NWs) on fluorine doped tin oxide (FTO) substrates through hydrothermal reaction has attracted wide attention and research, especially in the case of the solar cells. Actually, the built-in electric field at the anatase TiO2 NWs/FTO interface leads to the photoexcited holes transfer to FTO conductive substrates because the Fermi energy of anatase TiO2 NWs film is higher than that of FTO substrates. Yet efficient transport of photoexcited electron to the FTO conductive substrates is desirable. Hence, the built-in electric field at the pure TiO2 NWs/FTO interface has prevented anatase TiO2 NWs-based solar cells from achieving a higher photoelectric performance. In this work, we elaborately design and construct the N-doped anatase TiO2 NWs/FTO interface with the desirable orientations from FTO toward N-doped anatase TiO2 NWs, which favors the photoexcited electron transfer to the FTO conductive substrates. The surface photovoltage (SPV) and Kelvin probe measurements demostrate that the N-doped anatase TiO2 NWs/FTO interface favors the photoexcited electron transfer to the FTO conductive substrates due to the fact that the orientation of the built-in electric field at the N-doped TiO2 NI/Vs/FTO interface is from FTO toward TiO2. The photoexcited charge transfer dynamics of CdS QD-sensitized TiO2 NWs and N-doped TiO2 NWs electrodes was investigated using the transient photovoltage (TPV) and transient photocurrent (TPC) technique. Benefiting from the desirable interface electric field, CdS-based quantum dot-sensitized solar cells (QDSCs) with the optimal N doping amount exhibit a remarkable solar energy conversion efficiency of 2.75% under 1 sun illumination, which is 1.46 times enhancement as compared to the undoped reference solar cells. The results reveal that the N-doped anatase TiO2 NWs electrodes have promising applications in solar cells.
机译：通过水热反应的氟掺杂氧化锡（FTO）基材上的锐钛矿TiO2纳米线（NWS）的生长引起了广泛的关注和研究，特别是在太阳能电池的情况下。实际上，Anatase TiO2 NWS / FTO接口处的内置电场导致光屏蔽孔转移到FTO导电基材，因为锐钛矿TiO 2 NWS膜的Fermi能量高于FTO基板。然而，理想地，可高效地将光屏蔽电子传输到FTO导电基材。因此，纯TiO2NWS / FTO界面处的内置电场已经阻止了基于Anatase TiO2 NWS的太阳能电池来实现更高的光电性能。在这项工作中，我们精心设计并构建N掺杂的锐钛矿TiO2NWS / FTO与来自FTO朝向N掺杂的锐钛矿TiO2 NWS的所需取向，这使得光透射电子转移到FTO导电基材。表面光伏（SPV）和Kelvin探针测量脱溶溶液，即由于内置电场在N-中的内置电场的方向，N-掺杂的锐钛矿TiO2 NWS / FTO接口界面有利于光透射电子转移到FTO导电基板。掺杂TiO2 Ni / Vs / FTO接口来自FTO朝向TiO2。采用瞬态光电电压（TPV）和瞬态光电流（TPC）技术研究了CDS QD敏化TiO2NWS和N掺杂TiO2 NWS电极的光孔曝光电荷传递动态。受益于所需的界面电场，基于CDS的量子点敏化太阳能电池（QDSC），具有最佳N掺杂量，其在1次太阳照明下的显着太阳能转换效率为2.75％，与...相比，增强率为1.46倍。未掺杂的参考太阳能电池。结果表明，N掺杂的锐钛矿TiO 2 NWS电极在太阳能电池中具有希望的应用。

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