期刊
NANOSCALE
卷 8, 期 30, 页码 14432-14437出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr03021a
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资金
- Research Fund for the Doctoral Program of Higher Education of China [20120201130004]
- Science and Technology Developing Project of Shaanxi Province [2015KW-001]
- National Natural Science Foundation of China [51502239]
- China Postdoctoral Science Foundation [2015M582659]
- 111 Project of China [B14040]
Up-conversion beta-NaYF4:Yb3+, Tm3+/NaYF4 core-shell nanoparticles (NYF NPs) with a high luminous intensity in the visible light region were synthesized by a hydrothermal reaction process. Photocurrent densities of the mesoscopic perovskite solar cells fabricated by incorporating up-conversion NYF NPs into the electron transporting layer are effectively enhanced. The effects of the thicknesses of the electron transporting layer and the weight ratio of up-conversion NYF NPs/TiO2 on the power conversion efficiency (PCE) of the as-fabricated devices were also investigated. The results indicate that the PCE of the optimized device achieves 16.9%, which is 20% higher than that of the device without introducing NYF NPs, and the steady-state PCE of the as-fabricated devices is close to its transient-state PCE. The up-conversion effect of NYF NPs is conducive to higher device performance rather than the nanoparticles as scattering centers to increase possible light absorption of the perovskite film or the electronic effect of the NaYF4 shell surface. These results can be further confirmed by finite-difference time-domain simulation. Photoluminescence results suggest that the multiphonon-assistance can accelerate the non-radiative recombination process at a lower temperature. Incorporating NYF NPs into the electron transporting layer opens a new approach to a promising family of electron transporting materials for mesoscopic perovskite solar cells.
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