Chinese Optics Letters, Vol. 17, Issue 9, 091601 (2019)
Efficient up-conversion Yb3+, Er3+ co-doped Na5Lu9F32 single crystal for photovoltaic application under solar cell spectrum excitation
Xiong Zhou1, Hui Wang1, Haiping Xia1,*, Hongwei Song2,**, Xu Chen2, Jianxu Hu1, and Baojiu Chen3
- 1Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, China
- 2State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering and College of Physics, Jilin University, Changchun 130012, China
- 3Department of Physics, Dalian Maritime University, Dalian 116026, China
Yb3+/Er3+ co-doped Na5Lu9F32 single crystals used as a spectral up-converter to improve the power conversion efficiency of perovskite solar cells are prepared via an improved Bridgman approach. Green and red up-conversion (UC) emissions under the excitation of near-infrared (NIR) bands of 900–1000 nm and 1400–1600 nm can be observed. The effectiveness of the prepared materials as a spectral converter is verified by the enhancement of power conversion efficiency of perovskite solar cells. The sample with a UC layer is 15.5% more efficient in converting sunlight to electricity compared to the UC layer-free sample due to the absorption of sunlight in the NIR range. The results suggest the synthesized Yb3+/Er3+ co-doped Na5Lu9F32 single crystals are suitable for enhancing the performance of perovskite solar cells.