Although the anomalous ferroelectric photovoltaic effect of bismuth ferrite(BiFeO_(3))has recently drawn widespread attention,very low photocurrent density and poor power conversion efficiency severely hinder its prac...Although the anomalous ferroelectric photovoltaic effect of bismuth ferrite(BiFeO_(3))has recently drawn widespread attention,very low photocurrent density and poor power conversion efficiency severely hinder its practical application as a photovoltaic device.A novel photovoltaic architecture was herein designed and constructed to achieve enhanced photovoltaic performance in(Sm and Ni)gradient-doped BiFeO_(3)multilayers.The experimental results and analysis show that the gradient distribution of oxygen vacancies greatly enhances the photovoltaic performance of the gradient-doped BiFeO_(3)multilayer.In particular,its photocurrent density(Jsc)of 80μA cm^(-2)and open-circuit voltage(V_(oc))of 0.49 V are much higher than those of pure BiFeO_(3)films reported in previous literature.Meanwhile,a possible underlying mechanism was finally proposed to demonstrate the enhanced photovoltaic property,that is,the oxygen vacancy gradient distribution coupled with the flexoelectric effect greatly enhances the separation of photogenerated carriers,thereby ultimately enhancing the photovoltaic output of the above photovoltaic architecture.展开更多
基金Financial support by the National Natural Science Foundation of China(grant no.52072296)。
文摘Although the anomalous ferroelectric photovoltaic effect of bismuth ferrite(BiFeO_(3))has recently drawn widespread attention,very low photocurrent density and poor power conversion efficiency severely hinder its practical application as a photovoltaic device.A novel photovoltaic architecture was herein designed and constructed to achieve enhanced photovoltaic performance in(Sm and Ni)gradient-doped BiFeO_(3)multilayers.The experimental results and analysis show that the gradient distribution of oxygen vacancies greatly enhances the photovoltaic performance of the gradient-doped BiFeO_(3)multilayer.In particular,its photocurrent density(Jsc)of 80μA cm^(-2)and open-circuit voltage(V_(oc))of 0.49 V are much higher than those of pure BiFeO_(3)films reported in previous literature.Meanwhile,a possible underlying mechanism was finally proposed to demonstrate the enhanced photovoltaic property,that is,the oxygen vacancy gradient distribution coupled with the flexoelectric effect greatly enhances the separation of photogenerated carriers,thereby ultimately enhancing the photovoltaic output of the above photovoltaic architecture.
