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Chin. Phys. B, 2020, Vol. 29(4): 046104    DOI: 10.1088/1674-1056/ab7742
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO2 thin film

Shao Li(李绍), Gang Li(李刚), Li-Shuang Yang(杨丽爽), Kui-Ying Li(李葵英)
State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China
Abstract  Mn:ZnSe/ZnS/L-Cys core-shell quantum dots (QDs) sensitized La-doped nano-TiO2 thin film (QDSTF) was prepared. X-ray photoelectron spectroscopy (XPS), nanosecond transient photovoltaic (TPV), and steady state surface photovoltaic (SPV) technologies were used for probing the photoelectron behaviors in the Mn-doped QDSTF. The results revealed that the Mn-doped QDSTF had a p-type TPV characteristic. The bottom of the conduction band of the QDs as a sensitizer was just 0.86 eV above that of the La-doped nano-TiO2 thin film, while the acceptor level of the doped Mn2+ ions was located at about 0.39 eV below and near the bottom of the conduction band of the QDs. The intensity of the SPV response of the Mn-doped QDSTF at a specific wavelength was ~2.1 times higher than that of the undoped QDSTF. The region of the SPV response of the Mn-doped QDSTF was extended by 191 nm to almost the whole visible region as compared with the undoped QDSTF one. And the region of the TPV response of the Mn-doped QDSTF was also obviously wider than that of the undoped QDSTF. These PV characteristics of the Mn-doped QDSTF may be due to the prolonged lifetime and extended diffusion length of photogenerated free charge carriers injected into the sensitized La-doped nano-TiO2 thin film.
Keywords:  doping effects      ZnSe quantum dots sensitization      nano-TiO2 thin film      photoelectron spectroscopy  
Received:  16 December 2019      Revised:  28 January 2020      Published:  05 April 2020
PACS:  61.72.uj (III-V and II-VI semiconductors)  
  73.63.Kv (Quantum dots)  
  82.80.Pv (Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.))  
  74.78.-w (Superconducting films and low-dimensional structures)  
Fund: Project supported by the Natural Science Foundation of Hebei Province, China (Grant No. E2017203029).
Corresponding Authors:  Kui-Ying Li     E-mail:  kuiyingli@ysu.edu.cn

Cite this article: 

Shao Li(李绍), Gang Li(李刚), Li-Shuang Yang(杨丽爽), Kui-Ying Li(李葵英) Improved carrier transport in Mn:ZnSe quantum dots sensitized La-doped nano-TiO2 thin film 2020 Chin. Phys. B 29 046104

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