Luminescent material with functionalized graphitic carbon nitride as a photovoltaic booster in DSSCs: Enhanced charge se
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Luminescent material with functionalized graphitic carbon nitride as a photovoltaic booster in DSSCs: Enhanced charge separation and transfer Yanzhou Zhang1, Kai Pan1, Yang Qu1, Guofeng Wang1,a) Weiping Qin4
, Qilin Dai2, Dingsheng Wang3,
1
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China Department of Physics, Jackson State University, Jackson, Mississippi, USA 3 Department of Chemistry, Tsinghua University, Beijing 100084, China 4 College of Electronic Science and Engineering, Jilin University, Changchun 120012, China a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 14 September 2018; accepted: 27 November 2018
Small luminescent Y2O3:Eu31 particles were prepared by a hydrothermal method first, and then, Y2O3:Eu31/ C3N4 nanocomposites were further prepared by a chemisorption method. The luminescent Y2O3:Eu31/C3N4 nanocomposites are not only a promising down-conversion luminescent material, but also it could be used to improve the efficiencies of dye-sensitized solar cells (DSSCs). Especially, the morphology of Y2O3:Eu31 has great influence on the performance of DSSCs. Compared with Y2O3:Eu31 nanorods, the introduction of small Y2O3:Eu31 particles into the cells is conducive to the improvement of cell efficiency. The efficiencies of TiO2Y2O3:Eu31–C3N4 composite cells were not only higher than those of pure TiO2 cells but also higher than those of TiO2-Y2O3:Eu31 or TiO2-C3N4 composite cells, resulting in the enhancement of the average efficiency of the TiO2-Y2O3:Eu31–C3N4 composite cell from 7.16% to 8.14%, with 14% improvement over the pure TiO2 cell. The enhancement of the efficiency can be attributed to the synergetic effect of small Y2O3:Eu31 particles and C3N4.
Introduction The dye-sensitized solar cell (DSSC) has become one of the most promising solar cells in the renewable energy research and development field for its potential low fabrication cost and higher photoelectric conversion efficiency [1, 2, 3, 4, 5, 6, 7, 8]. As one of the most important parts of the DSSC, the photoanodes have attracted special concerns. For many years, TiO2 has been widely used as an ideal photoelectrode material because of its large surface area for loading more dye molecules, which not only plays a crucial role in the charge transport and the amount of adsorbed dye molecules but also significantly affects the overall energy conversion [9, 10]. To further improve the photovoltaic conversion efficiency of DSSC, some attempts have been adopted to modify TiO2, such as doping of metal or nonmetal elements, surface modifications, and combination with narrow band gap semiconductors [11, 12, 13, 14, 15].
ª Materials Research Society 2019
C3N4 has been investigated extensively in many energy and environment-related fields because of its superior catalytic, optical, and electronic properties [16, 17, 18, 19]. More importantly, C3N4 not only can absorb a large part of visible light directly
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