Abstract
Water-soluble Mn2+-doped ZnSe quantum dots (QDs) were synthesized using a hydrothermal method. The characteristics of the precursor solutions greatly affected the photoluminescence (PL) properties of the ZnSe:Mn QDs. In QDs synthesized with alkaline precursor solutions, a PL band originating from the intra-3d shell transition of Mn2+ is clearly observed, indicating that Mn2+ ions are thoroughly doped inside the ZnSe QDs. The PL quantum yield of the ZnSe:Mn QDs synthesized under the optimum conditions reached 20%. By introducing a ZnS shell at the surface of the ZnS:Mn QDs, the PL properties were improved and the PL quantum yield was further increased to 30%.
Highlights
Solar power generation is an important renewable energy source and silicon-based solar cells are currently the most widespread type of solar cell used
In quantum dots (QDs) synthesized with alkaline precursor solutions, a PL band originating from the intra-3d shell transition of Mn2+ is clearly observed, indicating that Mn2+ ions are thoroughly doped inside the ZnSe QDs
In the synthesis of semiconductor QDs using a hydrothermal method, the pH of the precursor solutions is an important parameter[39,42] and the optimum pH value for the preparation of ZnSe QDs has been reported to be a pH of 6.39 the ZnSe:Mn QDs were first prepared from a ZnSe:Mn (2% Mn) precursor solution with a pH of 6
Summary
Solar power generation is an important renewable energy source and silicon-based solar cells are currently the most widespread type of solar cell used. Silicon solar cells have low spectral sensitivity to ultraviolet light. As a method to solve this problem, the development of a wavelength conversion material that converts light in the ultraviolet wavelength region to visible light at the high spectral sensitivity of a silicon-based solar cell is desired.[1,2,3,4,5,6,7,8] Recently, the application of organic dyes[1,2,3,4,5] and semiconductor quantum dots (QDs)[3,6,7,8,9] as wavelength conversion materials has attracted much attention. Because organic dyes can only absorb light in a limited wavelength range corresponding to their intrinsic absorption characteristics, the range of wavelengths that can be used in such a wavelength conversion material is limited.[3,10,11] semiconductor QDs can absorb light in all wavelength regions shorter than their absorption onset and it is possible to control the onset wavelength via the QD size owing to quantum size effects.[12,13] when compared to organic dyes, QDs are more stable against light irradiation.[10,11] it is thought that they have great potential as a wavelength conversion material
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