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

doi:10.1088/1674-1056/ab7742

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
Accepted manuscript online:

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

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

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