Tunable photoelectrochemical performance of Au/BiFeO3 heterostructure

Yen Lin Huang, Wei Sea Chang, Chien Van Nguyen, Heng Jui Liu, Kai An Tsai, Jhih Wei Chen, Ho Hung Kuo, Wen Yen Tzeng, Yi Chun Chen, Chung Lin Wu, Chih Wei Luo, Yung Jung Hsu, Ying Hao Chu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


Ferroelectric photoelectrodes, other than conventional semiconductors, are alternative photo-absorbers in the process of water splitting. However, the capture of photons and efficient transfer of photo-excited carriers remain as two critical issues in ferroelectric photoelectrodes. In this work, we overcome the aforementioned issues by decorating the ferroelectric BiFeO3 (BFO) surface with Au nanocrystals, and thus improving the photoelectrochemical (PEC) performance of BFO film. We demonstrate that the internal field induced by the spontaneous polarization of BFO can (1) tune the efficiency of the photo-excited carriers' separation and charge transfer characteristics in bare BFO photoelectrodes, and (2) modulate an extra optical absorption within the visible light region, created by the surface plasmon resonance excitation of Au nanocrystals to capture more photons in the Au/BFO heterostructure. This study provides key insights for understanding the tunable features of PEC performance, composed of the heterostructure of noble metals and ferroelectric materials.

Original languageEnglish
Pages (from-to)15795-15801
Number of pages7
Issue number34
StatePublished - 14 Sep 2016


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