期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 754, 期 -, 页码 124-130出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.04.283
关键词
Enhanced up-conversion; Ho3+-Yb3+-Li+ tri-doped TiO2; Perovskite solar cell
资金
- NSFC-Henan Province Joint Fund [U1604144]
- Science Fund of Henan Province [162300410020]
- Education Department of Henan Province [17A140005, 17B140001]
- Science and Technology Development Project of Henan Province [172102410043, 162102210170]
- Program for Science and Technology Innovation Talents in Universities of Henan Province [16HASTIT043]
In this paper, an enhanced up-conversion luminescence material of Ho3+-Yb3+-Li+ tri-doped TiO2 was prepared by optimizing the concentration of Yb3+ and Li+. The up-conversion material was applied to modify the mesoporous layer TiO2 of the perovskite solar cells. Compared with that of solar cells without modification, the power conversion efficiency of the solar cells with Ho3+-Yb3+-Li+ tri-doped TiO2 modification is increased to 16.9% from 15.5%. In order to deeply understand the improvement, a number of investigations were conducted. The research indicates that the open-circuit voltage is added to 1.08 v from 1.06 v could be attributed to the larger energy difference between the conduction bands of upconversion material of TiO2 and perovskite material. And the enlarged short-circuit current density is due to the faster electron transfer, reduced recombination, and the expansion of light absorption in the near infrared part of sunlight in the device that induced by adding up-conversion luminescence material. (c) 2018 Elsevier B.V. All rights reserved.
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