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Method of utilizing a built-in electric field in polar crystal to adjust and control separation efficiency and optic electrochemical activity of photon-generated carriers in photoelectrode of ZnO single crystal

A photoelectrode and electrochemical technology, which is applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve the problem of limited improvement in the separation efficiency of photogenerated carriers, and achieve improved carrier separation efficiency and activity, The effect of simple preparation method and enhanced separation efficiency

Inactive Publication Date: 2017-02-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of these methods on improving the separation efficiency of photogenerated carriers is limited.

Method used

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  • Method of utilizing a built-in electric field in polar crystal to adjust and control separation efficiency and optic electrochemical activity of photon-generated carriers in photoelectrode of ZnO single crystal
  • Method of utilizing a built-in electric field in polar crystal to adjust and control separation efficiency and optic electrochemical activity of photon-generated carriers in photoelectrode of ZnO single crystal
  • Method of utilizing a built-in electric field in polar crystal to adjust and control separation efficiency and optic electrochemical activity of photon-generated carriers in photoelectrode of ZnO single crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Process the C-cut and M-cut ZnO single crystal wafers to a thickness of 0.05-0.5 mm, and use H 3 PO 4 / CH 3 COOH / H 2 Soak the mixed solution of O (1:1:30, pH=1.3) for 5 minutes, wash with deionized water, and dry. Two C-cut ZnO single crystal wafers and M-cut ZnO single crystal wafers were respectively selected, and gold was sprayed on the (0001), (000-1) and (10-10) surfaces, and then the gold-sprayed ZnO single crystal wafers were heated at 500 °C Annealed for 10 minutes, and the ZnO single crystal electrode ( figure 1 ), the electrode is named after the exposed crystal plane of the non-sprayed gold surface, such as: the electrodes with exposed crystal planes of (0001), (000-1) and (10-10) planes are named: Zn-SC, O-SC and M -SC. The direction of the electric field inside the electrode is figure 1 The direction pointed by the black tip, in Zn-SC, the direction of the built-in electric field is perpendicular to the electrode surface and points to the Au electrode...

Embodiment 2

[0039] Process the C-cut and M-cut ZnO single crystal wafers to a thickness of 0.05-0.5 mm, and use H 3 PO 4 / CH 3 COOH / H 2 Soak the mixed solution of O (1:1:30, pH=1.3) for 1 to 10 minutes, wash with deionized water, and dry. Two C-cut ZnO single crystal wafers and M-cut ZnO single crystal wafers were respectively selected, and gold was sprayed on the (0001), (000-1) and (10-10) surfaces, and then the gold-sprayed ZnO single crystal wafers were heated at 510 °C Annealed for 1 minute, and the wire was drawn out on the gold-sprayed surface to prepare a ZnO single crystal electrode ( figure 1 ), the electrode is named after the exposed crystal plane of the non-sprayed gold surface, such as: the electrodes with exposed crystal planes of (0001), (000-1) and (10-10) planes are named: Zn-SC, O-SC and M -SC. The direction of the electric field inside the electrode is figure 1 The direction pointed by the black tip, in Zn-SC, the direction of the built-in electric field is perpe...

Embodiment 3

[0044] Process the C-cut and M-cut ZnO single crystal wafers to a thickness of 0.05-0.5 mm, and use H 3 PO 4 / CH 3 COOH / H 2 Soak the mixed solution of O (1:1:30, pH=1.3) for 1 to 10 minutes, wash with deionized water, and dry. Two C-cut ZnO single crystal wafers and M-cut ZnO single crystal wafers were respectively selected, and gold was sprayed on the (0001), (000-1) and (10-10) surfaces, and then the gold-sprayed ZnO single crystal wafers were heated at 505 °C Annealed for 5 minutes, and the ZnO single crystal electrode ( figure 1 ), the electrode is named after the exposed crystal plane of the non-sprayed gold surface, such as: the electrodes with exposed crystal planes of (0001), (000-1) and (10-10) planes are named: Zn-SC, O-SC and M -SC. The direction of the electric field inside the electrode is figure 1 The direction pointed by the black tip, in Zn-SC, the direction of the built-in electric field is perpendicular to the electrode surface and points to the Au elec...

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Abstract

The invention provides a method of utilizing a spontaneous polarization built-in electric field in a ZnO single crystal to adjust and control separation efficiency and optic electrochemical property of photon-generated carriers in a photoelectrode of the ZnO single crystal. Through adjusting direction of the polarization built-in electric field in the electrode of the ZnO single crystal, separation efficiency of photon-generated carriers in the electrode of the ZnO single crystal is controlled to regulate and control light current and photoelectric conversion efficiency. When the direction of the built-in electric field in the ZnO single crystal is perpendicular to the surface of the electrode and points to the outer surface (O-SC), light current, quantum conversion efficiency and separation efficiency of carriers in the electrode are effectively enhanced. The method is simple and effective to further improve the separation efficiency and activity of carriers of the photoelectrode of photoelectrochemistry and has potential application value.

Description

technical field [0001] The invention belongs to the field of photoelectric water splitting, and particularly relates to a method for regulating the separation efficiency and photoelectrochemical activity of photogenerated carriers inside a ZnO single crystal photoelectrode by using a built-in electric field of a polar crystal. Background technique [0002] Energy shortage and environmental pollution have become the most serious problems faced by countries all over the world. How to effectively solve energy and environmental problems is of great significance to the entire human society. Solar energy, as a new energy source with abundant reserves, low price and green environmental protection, has received widespread attention. Recently, various high and new technologies based on solar energy utilization have attracted extensive attention of researchers from all over the world. Photoelectrochemical technology is a new technology that effectively utilizes solar energy resources...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06C30B29/16
CPCC25B1/04C30B29/16C25B1/55C25B11/057Y02E60/36
Inventor 王泽岩张博黄柏标张晓阳秦晓燕王朋刘媛媛
Owner SHANDONG UNIV
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