Synthesis of Mn-doped zinc blende CdSe nanocrystals for quantum dot-sensitized solar cells |
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| Authors: | Bin Bin Jin Xiu Wei Wang Jun Li Cui Li Hua Liu Yu Cao Tian Chen Dong Wei Ye Feng Wang Jing Hui Zeng |
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| Institution: | 1.Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering,Shaanxi Normal University,Xi’an,China;2.Department of Chemical Engineering, Institute of Chemical Industry,Shaanxi Institute of Technology,Xi’an,China;3.School of Chemistry and Chemical Engineering,Shaanxi Normal University,Xi’an,China |
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| Abstract: | Mn-doped CdSe quantum dots (QDs) with a zinc blende structure were synthesized via a phosphine-free method in octadecene (ODE) and oleic acid. The structure, size, morphology, and optical property of the QDs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV–visible absorption spectra (UV–Vis), respectively. The QDs were assembled onto a microporous TiO2 photoanode by an ex situ ligand exchange route. Quantum dot-sensitized solar cells (QDSCs) based on the above-synthesized QDs and polysulfide electrolytes were fabricated. The photovoltaic performance and impedance of the CdSe and Mn-doped CdSe QDSCs were further investigated. An improvement in efficiency to 1.84 % was achieved as compared with 0.94 % for the QDSCs based on the pure CdSe QDs. The improvement was ascribed to the existence of long-lived high-energy doping levels on the large-sized Mn-doped CdSe QDs, which provides a significant driving force for faster charge separation and electron transfer. |
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