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Citric acid-assisted growth of lanthanide ions co-doped one-dimensional upconversion microcrystals and their photovoltaic applications |
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| Authors: | Rui Cheng Yanrui Chen Zhiqiang Li Xiaohong Chen Pingxiong Yang Hongbing Zhu Yuelong Huang Zhuo Sun Sumei Huang |
| Affiliation: | 1. Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, North Zhongshan Rd. 3663, Shanghai, 200062, People’s Republic of China 2. Key Laboratory of Polar Materials and Devices, Department of Electronic Engineering, East China Normal University, North Zhongshan Rd. 3663, Shanghai, 200062, People’s Republic of China 3. Baoding Tianwei Solar Films Co., LTD, State High-Tech Industry Development Zone, No. 127 Lugang Road, Baoding, Hebei, People’s Republic of China |
| Abstract: | We report for the first time the preparation of Yb3+–Er3+ co-doped β-phase sodium gadolinium fluoride (NaGdF4:Yb/Er) microcrystals using citric acid (CA) as a shape modifier and the application of NaGdF4:Yb/Er to amorphous silicon solar cells. The proposed hydrothermal method was facile and eco-friendly. It was found that CA played a critical role in the shape evolution of the final products. The related synthesis mechanisms are discussed. Under 980 nm laser excitation, the optimized NaGdF4:Yb/Er crystals exhibited strong upconversion (UC) emissions at visible wavelengths. Amorphous silicon thin film solar cells were designed and fabricated for investigating different UC configurations. In combination with a metallic back reflector, the cell with the front side UC layer achieved a six-fold improvement of the photocurrent while the cell with the rear side UC layer exhibited a ten-fold enhancement of the photocurrent, under 980 nm light, compared with the cell without upconverter. |
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