Enhanced Power Conversion Efficiency of Perovskite Solar Cells with an Up-Conversion Material of Er3+-Yb3+-Li+ Tri-doped TiO2

摘要

In this paper, Er³⁺-Yb³⁺-Li⁺ tri-doped TiO2 (UC-TiO2) was prepared by an addition of Li⁺ to Er³⁺-Yb³⁺ co-doped TiO2. The UC-TiO2 presented an enhanced up-conversion emission compared with Er³⁺-Yb³⁺ co-doped TiO2. The UC-TiO2 was applied to the perovskite solar cells. The power conversion efficiency (PCE) of the solar cells without UC-TiO2 was 14.0%, while the PCE of the solar cells with UC-TiO2 was increased to 16.5%, which presented an increase of 19%. The results suggested that UC-TiO2 is an effective up-conversion material. And this study provided a route to expand the spectral absorption of perovskite solar cells from visible light to near-infrared using up-conversion materials.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2545-y) contains supplementary material, which is available to authorized users.