title: Enhanced photovoltaic performance of dye-sensitized solar cells based on NaYF4:Yb(3+), Er(3+)-incorporated nanocrystalline TiO2 electrodes.
abstract: Near infrared to visible up-conversion of light by rare earth ion-doped phosphors (NaYF4:Yb(3+), Er(3+)) that convert multiple photons of lower energy to higher energy photons offer new possibilities for improved performance of photovoltaic devices. Here, up-conversion phosphor NaYF4:Yb(3+), Er(3+) doped nanocrystalline TiO2 films are designed and used as a electrode for dye-sensitized solar cells, and the photovoltaic performance of DSSCs based on composite electrodes are investigated. The results show the cell with NaYF4:Yb(3+), Er(3+) achieves a power conversion efficiency of 7.65% under one sun illumination (AM 1.5G, 100mWcm(-2)), which is an increase of 14% compared to the cell without NaYF4:Yb(3+), Er(3+) (6.71%). The performance improvement is attributed to the dual effects of enhanced light harvesting from extended light absorption range and increased light scattering, and lower electron transfer resistance.
authors: Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China.
authors: Guang
authors: G
authors: Zhu
authors: Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China.
authors: Hongyan
authors: H
authors: Wang
authors: Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
authors: Quanxin
authors: Q
authors: Zhang
authors: Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China. Electronic address: guangzhu@ahsztc.edu.cn.
authors: Li
authors: L
authors: Zhang
keywords: Dye sensitized solar cell; Light harvesting; Light scattering; NaYF(4):Yb(3+), Er(3+)