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Carrier Dynamics of Anatase and Rutile TiO{sub}2 Nanostructured Electrodes Adsorbed with CdSe Quantum Dots

机译:锐钛矿和金红石TiO的载体动力学{Sub} 2纳米结构电极吸附着Cdse量子点

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Ultrafast carrier dynamics of anatase and rutile TiO{sub}2 nanostructured electrodes deposited with CdSe quantum dots (QDs) are studied using lens-free heterodyne detection transient grating (LF-HD-TG) technique. We find that the relaxation time of the photoexcited holes is as long as a few hundreds ps for rutile TiO{sub}2, but is smaller than 2 ps for anatase TiO{sub}2. Two decay processes with time scales of 2 ps (τ{sub}1) and a few tens ps or hundreds ps (τ{sub}2) are observed for CdSe QDs. The fast decay process is considered as photoexcited hole relaxation owing to trapping by the surface states of CdSe QDs. While the slow decay process reflects photoexcited electron relaxation processes, and mainly electron transfer from CdSe QDs to TiO{sub}2. We find that relaxation time of electrons (τ{sub}2) depends greatly on the crystal structure of TiO{sub}2.
机译:使用无透镜外差检测瞬态光栅(LF-HD-TG)技术研究了沉积酶和金红石TiO {Sub} 2纳米结构电极的锐钛酶和金红石TiO的动力学。我们发现光屏蔽孔的放松时间只需为金红石TiO {sub} 2的几百ps,但对于Anatase TiO {sub} 2小于2 ps。对于CDSE QD,观察到具有2 ps(τ{sub} 1)和几十个PS或数百个PS(τ{sub} 2)的两个衰减过程。由于CDSE QD的表面状态捕获,快速衰变过程被认为是运动孔弛豫。虽然缓慢衰变过程反映了光屏蔽的电子放松过程,并且主要是从CDSE QDS到TIO {SUB} 2的电子转移。我们发现电子的放松时间(τ{sub} 2)大大取决于TiO {sub} 2的晶体结构。

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