Band-Gap Reduction in (BiCrO3)(m)/(BiFeO3)(n) Superlattices: Designing Low-Band-Gap Ferroelectrics
Band-Gap Reduction in (BiCrO3)(m)/(BiFeO3)(n) Superlattices: Designing Low-Band-Gap Ferroelectrics
复制标题
(BiCrO3)(m)/(BiFeO3)(n) 超晶格中的带隙减小：设计低带隙铁电体
DOI：
10.1103/physrevapplied.10.044004
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发表时间：
2018
影响因子：
4.6
通讯作者：
Qiao Liang
中科院分区：
文献类型：
--
作者：
Zhang Sa;Xiao Haiyan;Peng Shuming;Yang Guixia;Liu Zijiang;Zu Xiaotao;Li Sean;Singh David Joseph;Martin Lane W.;Qiao Liang
Ferroelectricis promising for photovoltaic applications, especially in regard to the exploitation of ferroelectric photovoltaic effects for charge separation. However, its large band gap limits efficient sunlight absorption. Here, we demonstrate a new strategy to effectively tune the band gap of tetragonalvia superlattice structuring with the ferroelectric. Thesuperlattices are found to exhibit conventional ferroelectric properties, but low fundamental band gaps, smaller than either of the parent materials. First-principles calculations reveal that the unexpected band-gap reduction is induced by charge reconstruction due to lattice strain, octahedral distortion, and polarization discontinuity at the-interfaces. Ultimately, these results provide a new strategy, in the form of superlattice structuring, which could open the door to the creation of efficient ferroelectric photovoltaics.
