Adsorption and Electronic Structure of CdSe Quantum Dots on Single Crystal ZnO: A Basic Study of Quantum Dot-Sensitization System
Adsorption and Electronic Structure of CdSe Quantum Dots on Single Crystal ZnO: A Basic Study of Quantum Dot-Sensitization System
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DOI：
10.1021/acs.jpcc.6b04130
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发表时间：
2016-07
影响因子：
3.7
通讯作者：
T. Toyoda;W. Yindeesuk;Keita Kamiyama;S. Hayase;Q. Shen
中科院分区：
文献类型：
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作者：
T. Toyoda;W. Yindeesuk;Keita Kamiyama;S. Hayase;Q. Shen
我们描述了不同晶体取向的单晶ZnO衬底上CdSe量子点的形貌，并考虑了其光吸收和基态能级。利用原子力显微镜（AFM）、光声光谱（PA）和光电子产额光谱（PY）分析了CdSe量子点的形貌和晶体生长情况。CdSe量子点的吸附和晶体生长取决于吸附时间和ZnO衬底的表面取向。ZnO上量子点的平均直径随吸附时间的变化与晶体表面取向无关，与单晶金红石- tio2不同，量子点的生长是一个两步的过程。这是在ZnO上生长的CdSe量子点与在金红石- tio2上生长的CdSe量子点之间的差异。在ZnO上生长的量子点的晶体质量比在金红石- tio2上生长的量子点的晶体质量差，说明在ZnO上生长的量子点的晶体质量比在金红石- tio2上生长的要差。
We describe the morphology and consider the optical absorption and the ground state energy level of CdSe quantum dots (QDs) on single crystal ZnO substrates with various crystal orientations. The morphologies and crystal growth of CdSe QDs were analyzed by atomic force microscopy (AFM), photoacoustic (PA) spectroscopy for the optical absorption measurements, and photoelectron yield (PY) spectroscopy to evaluate the ground state energy level. The adsorption and crystal growth of CdSe QDs depend on both the adsorption time and the surface orientation of the ZnO substrate. The change in average diameter of the QDs on ZnO with adsorption time is not related to the crystal surface orientation, and the growth is a two-step process, different from that on single crystal rutile-TiO2. This is characteristic of the difference between CdSe QDs grown on ZnO and those grown on rutile-TiO2. The crystal quality of the QDs on ZnO is poorer than those grown on rutile-TiO2, indicating that the reaction for crystal growth o...