Domain-engineered BiFeO3 thin-film photoanodes for highly enhanced ferroelectric solar water splitting View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-06-09

AUTHORS

Jaesun Song, Taemin Ludvic Kim, Jongmin Lee, Sam Yeon Cho, Jaeseong Cha, Sang Yun Jeong, Hyunji An, Wan Sik Kim, Yen-Sook Jung, Jiyoon Park, Gun Young Jung, Dong-Yu Kim, Ji Young Jo, Sang Don Bu, Ho Won Jang, Sanghan Lee

ABSTRACT

In photoelectrochemical (PEC) water splitting, charge separation and collection by the electric field in the photoactive material are the most important factors for improved conversion efficiency. Hence, ferroelectric oxides, in which electrons are the majority carriers, are considered promising photoanode materials because their high built-in potential, provided by their spontaneous polarization, can significantly enhance the separation and drift of photogenerated carriers. In this regard, the PEC properties of BiFeO3 thin-film photoanodes with different crystallographic orientations and consequent ferroelectric domain structures are investigated. As the crystallographic orientation changes from (001)pc via (110)pc to (111)pc, the ferroelastic domains in epitaxial BiFeO3 thin films become mono-variant and the spontaneous polarization levels increase to 110 μC/cm2. Consequently, the photocurrent density at 0 V vs. Ag/AgCl increases approximately 5.3-fold and the onset potential decreases by 0.180 V in the downward polarization state. It is further demonstrated that ferroelectric switching in the (111)pc BiFeO3 thin-film photoanode leads to an approximate change of 8,000% in the photocurrent density and a 0.330 V shift in the onset potential. This study strongly suggests that domain-engineered ferroelectric materials can be used as effective charge separation and collection layers for efficient solar water-splitting photoanodes. More... »

PAGES

642-655

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12274-017-1669-1

DOI

http://dx.doi.org/10.1007/s12274-017-1669-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085939562


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