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25 April 2024 |
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Inorganic photovoltaic cells based on BiFeO3: spontaneous, element substitution, lattice matching, light polarization and their relationship to photovoltaic performance | | Chao He
; Guocai Liu
; Huiyan Zhao
; Kun Zhao
; Zuju Ma
; Xingtao An
; | | Date: |
9 Jun 2019 | | Abstract: | Inorganic ferroelectric perovskite oxides are more stable than hybrid
perovskites. However, their solar energy harvest efficiency is not so good.
Here, by fabricating a serious of BiFeO3 based devices, we investigated four
factors that influence the photovoltaic performance, including spontaneous
polarization, mechanism of leakage current suppression by Co element
substitution, terminated atoms species in the heterogeneous structure with the
electrode, and polarized light irradiation with the framework of density
functional theory combined with non-equilibrium Green’s function theory under
built in electric field or finite bias. The results showed that 1)the
photocurrent is larger only under a suitable electronic band gap rather than
larger spontaneous polarization; 2) the BiFeO3 based solar cell degradation
could be suppressed by Co element substitution due to the dark current
suppression; 3) the photocurrent reaches the largest in Bi ions terminated
interface than the case of Fe or O with SrTiO3 devices; 4) the power conversion
efficiency could be largely enhanced if the polarized direction of the
monochromatic light is perpendicular to the spontaneous polarization direction.
The results will deepen the understanding of experimental results of BiFeO3
based solar cells. | | Source: | arXiv, 1906.3545 | | Services: | Forum | Review | PDF | Favorites | |
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