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Enhancing Photostability of Perovskite Solar Cells by Eu(TTA)2(Phen)MAA Interfacial Modification
journal contribution
posted on 2019-03-06, 00:00 authored by Wenbo Bi, Yanjie Wu, Boxue Zhang, Junjie Jin, Hao Li, Le Liu, Lin Xu, Qilin Dai, Cong Chen, Hongwei SongOrganic–inorganic
lead halide perovskite solar cells (PSCs) exhibit spectacular changes
in the photovoltaic area, but they still face the challenges of full
spectral utilization and photostability under continuous light irradiation.
The ultraviolet (UV) part in sunlight could induce oxygen vacancy
in the mesoporous TiO2 (m-TiO2) layer, resulting
in the degradation of perovskite photoactive films and the rapidly
decreased device performance. In this work, we demonstrate that an
effective luminescent downconversion material, Eu(TTA)2(Phen)MAA (ETPM), can be used as an interfacial modifier between
the m-TiO2 layer and the perovskite photoactive layer to
improve the power conversion efficiency (PCE) from 17.00 to 19.07%.
The improved device performance can be ascribed to the effective utilization
of incident UV light and reduced carrier recombination. Meanwhile,
the conversion of the UV light by ETPM could inhibit the stability
loss of the device under irradiation. As a result, the modified PSCs
can maintain 86% of their initial value under continuous light soaking
for 100 h, higher than that of 40% for the control device. This work
indicates that the introduction of the luminescent downconversion
material ETPM can successfully improve the PCE and photostability
of PSCs.