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Tip-enhanced photovoltaic effects in bismuth ferrite

Author

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  • Marin Alexe

    (Max Planck Institute of Microstructure Physics)

  • Dietrich Hesse

    (Max Planck Institute of Microstructure Physics)

Abstract

Photoelectric properties of multiferroic BiFeO3, such as large photovoltages exceeding several times the bandgap or switchable photocurrents, have recently generated much interest. This is mostly because of potential applications in photovoltaic or photocatalytic devices. Although the fundamentally different (from classical semiconductors) polarization-related charge separation mechanisms allow unlimited photovoltages, these materials have never been considered a viable alternative to classical semiconductor-based photovoltaics because of a very low light conversion efficiency of less than 10−4. Here we investigate the anomalous photovoltaic effect in bismuth ferrite BiFeO3 single crystals, using photoelectric atomic force microscopy and piezoresponse force microscopy. We show that using a nanoscale top electrode, the photoexcited carriers are efficiently collected and the external quantum efficiency is enhanced by up to seven orders of magnitude. This enhancement might provide a viable alternative for the effective use of the anomalous photovoltaic effect in photovoltaic applications.

Suggested Citation

  • Marin Alexe & Dietrich Hesse, 2011. "Tip-enhanced photovoltaic effects in bismuth ferrite," Nature Communications, Nature, vol. 2(1), pages 1-5, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1261
    DOI: 10.1038/ncomms1261
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    1. Yong Liu & Mingjian Zhang & Zhuan Wang & Jiandong He & Jie Zhang & Sheng Ye & Xiuli Wang & Dongfeng Li & Heng Yin & Qianhong Zhu & Huanwang Jing & Yuxiang Weng & Feng Pan & Ruotian Chen & Can Li & Fen, 2022. "Bipolar charge collecting structure enables overall water splitting on ferroelectric photocatalysts," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Xiaoyi Xie & Pengliang Leng & Zhenyu Ding & Jinshan Yang & Jingyi Yan & Junchen Zhou & Zihan Li & Linfeng Ai & Xiangyu Cao & Zehao Jia & Yuda Zhang & Minhao Zhao & Wenguang Zhu & Yang Gao & Shaoming D, 2024. "Surface photogalvanic effect in Ag2Te," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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