Enhanced photoelectrochemical properties of Z-scheme ZnO/p-n Cu2O PV-PEC cells

Joon Soo Yoon, Joo Won Lee, Yun Mo Sung

Research output: Contribution to journalArticle

Abstract

We have tailored a photovoltaic-photoelectrochemical (PV-PEC) cell by integrating p-n Cu2O thin films and ZnO nanorods (NRs) on conductive oxide substrates for water splitting. The combined PV-PEC cell can benefit not only from the high oxidation potential of ZnO NRs but also from the visible range light absorption of Cu2O photovoltaics. Differently from previous methods to fabricate p-n Cu2O junctions, we employed the type transition from p-to n-Cu2O by a simple solution treatment and then p-Cu2O was coated on n-Cu2O to smoothen the p-n junction interface. We for the first time produced p-n homojunction Cu2O layers using the identical electrodeposition process. After Au thin film coating on n-Cu2O and p-n Cu2O layers by sputtering high-density ZnO NRs were grown by the hydrothermal method to construct the Z-scheme band structures. By comparing the photoresponses of ZnO NRs/Au/n-Cu2O and ZnO NRs/Au/p-n Cu2O, we could elucidate the effect of the built-in potential on PEC properties by p-n Cu2O. ZnO NRs/Au/p-n Cu2O showed the onset potential of −0.330 V which is more cathodic by 0.167 V than ZnO NRs/Au/n-Cu2O. Also, its photocurrent was 0.206 mA/cm2 under 0.2 V vs SCE which is 237% higher than that of ZnO NRs/Au/n-Cu2O. These enhancements are attributed to the internal electric field by the p-n junction and the efficient charge separation and migration by utilizing both the p-n junction and the Z-scheme.

LanguageEnglish
Pages869-876
Number of pages8
JournalJournal of Alloys and Compounds
Volume771
DOIs
Publication statusPublished - 2019 Jan 15

Fingerprint

Photoelectrochemical cells
Nanorods
Thin films
Photocurrents
Electrodeposition
Band structure
Oxides
Light absorption
Sputtering
Electric fields
Coatings
Oxidation
Water

Keywords

  • Electrodeposition
  • PV-PEC cell
  • Water splitting
  • Z-scheme

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Enhanced photoelectrochemical properties of Z-scheme ZnO/p-n Cu2O PV-PEC cells. / Yoon, Joon Soo; Lee, Joo Won; Sung, Yun Mo.

In: Journal of Alloys and Compounds, Vol. 771, 15.01.2019, p. 869-876.

Research output: Contribution to journalArticle

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AB - We have tailored a photovoltaic-photoelectrochemical (PV-PEC) cell by integrating p-n Cu2O thin films and ZnO nanorods (NRs) on conductive oxide substrates for water splitting. The combined PV-PEC cell can benefit not only from the high oxidation potential of ZnO NRs but also from the visible range light absorption of Cu2O photovoltaics. Differently from previous methods to fabricate p-n Cu2O junctions, we employed the type transition from p-to n-Cu2O by a simple solution treatment and then p-Cu2O was coated on n-Cu2O to smoothen the p-n junction interface. We for the first time produced p-n homojunction Cu2O layers using the identical electrodeposition process. After Au thin film coating on n-Cu2O and p-n Cu2O layers by sputtering high-density ZnO NRs were grown by the hydrothermal method to construct the Z-scheme band structures. By comparing the photoresponses of ZnO NRs/Au/n-Cu2O and ZnO NRs/Au/p-n Cu2O, we could elucidate the effect of the built-in potential on PEC properties by p-n Cu2O. ZnO NRs/Au/p-n Cu2O showed the onset potential of −0.330 V which is more cathodic by 0.167 V than ZnO NRs/Au/n-Cu2O. Also, its photocurrent was 0.206 mA/cm2 under 0.2 V vs SCE which is 237% higher than that of ZnO NRs/Au/n-Cu2O. These enhancements are attributed to the internal electric field by the p-n junction and the efficient charge separation and migration by utilizing both the p-n junction and the Z-scheme.

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