Details

Autor(en) / Beteiligte

• Cao, Junyu
• Xing, Juanjuan
• Zhang, Yuanjian
• Tong, Hua
• Bi, Yingpu
• Kako, Tetsuya
• Takeguchi, Masaki
• Ye, Jinhua

Titel

Photoelectrochemical Properties of Nanomultiple CaFe2O4/ZnFe2O4 pn Junction Photoelectrodes

Ist Teil von

• Langmuir, 2013-03, Vol.29 (9), p.3116-3124

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Nanomultiple CaFe2O4/ZnFe2O4 pn junctions are prepared by a pulsed laser deposition method to explore their photoelectrochemical properties as the photoelectrodes. It is demonstrated that the multiple-pn-junction structure is favorable to enhancing the photocurrent density and the onset potential of the photoelectrode. Furthermore, the 20-junction photoelectrode-based PEC cell yields a high open circuit photovoltage of up to 0.97 V, which is much higher than that for a single pn junction photoelectrode PEC cell that yields an open circuit photovoltage of 0.13 V. A multiple-junction band structure model is assumed to describe the behavior of the CaFe2O4/ZnFe2O4 multiple-junction photoelectrodes. It is suggested that the open circuit photovoltage is dominated by the number of pn junctions in a multiple-junction photoelectrode and the carrier transfer inside the photoelectrode is improved by narrowing the single-layer thickness. These findings provide a new approach to designing the multiple-junction structure to improve the PEC properties of the photoelectrodes.