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Xiuting Luo(나수정),Soohyung Kim(김수형) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Dye materials in dye-sensitized solar cells (DSSCs) can only absorb light within visible range (400 nm to 700nm). To improve the light harvesting of DSSCs, up-conversion phosphor (UCP) material composed of rare-earth Er<sup>3+</sup> and Yb<sup>3+</sup> co-doped TiO<sub>2</sub> and down-conversion phosphor (DCP) material composed of Eu<sup>2+</sup>, Nd<sup>3+</sup> co-doped CaAl<sub>2</sub>O<sub>4</sub> materials are synthesized by spray pyrolysis method, respectively, in this study. The UCP, DCP, and UCP/DCP composites are then introduced into photoanodes of DSSCs by mixing them with TiO<sub>2</sub> nanoparticles. By combining the UCP and DCP (ratio in 1:1, totally 5 wt% in TiO<sub>2</sub> matrix) into DSSCs, the resulting power conversion efficiency of DSSCs is observed to be 41.4% increment compared with reference DSSCs, and has the highest value of 8.19%, which is also higher than DSSCs based on single UCP of 7.55 % or single DCP 6.68%. This suggests that both the light converting and scattering effects of UCP and DCP fabricated in this study can extend the spectral absorption of DSSCs from UV and IR, which enabled us to minimize the solar photons loss and maximize the light harvesting efficiency.