深圳大学学报理工版

氧化亚铜在光伏及光催化等领域有潜在应用,掺氮能增加其空穴浓度从而提高电导率,但氮在氧化亚铜的状态仍未被深入研究.在溅射压强等参数不变的条件下,逐步增加氮气流量,制备了一系列纯相的氮掺杂的氧化亚铜,并用X射线衍射、台阶仪、扫描电子显微镜、能量色散谱仪、拉曼光谱、X射线光电子能谱仪、霍尔效应及分光光度计等方法对所得样品进行分析.霍尔效应测试结果表明,氮掺杂能使氧化亚铜薄膜空穴浓度提高1个数量级.禁带宽度随氮气流量的增加而逐渐减小,氮在氧化亚铜中以β-N(氮原子)、α-N2(分子态氮,—N=N—)及γ-N2(分子态氮,N≡N)3种形式存在,随着氮流量的增加,β-N的结合能的峰强不断增强,而α-N2的结合能的峰强不断减弱.氮流量为2标准立方厘米每分钟(sccm)时所得样品的电阻率最小.

Cuprous oxide(Cu2O)has the potential applications in photovoltaic and photocatalytic fields. Nitrogen-doping in Cu2O can improve the conductivity by increasing hole concentration.However, the chemical states of nitrogen in nitrogen-doped Cu2O have not been studied thoroughly.A series of nitrogen-doped Cu2O samples are prepared by increasing nitrogen flow rates and simultaneously keeping the sputtering pressure and other parameters unchanged. The samples are characterized by X-ray diffraction(XRD), step instrument, scanning electron microscope(SEM), energy dispersive spectrometer, Raman spectroscopy, X-ray photoelectron spectroscopy(XPS), spectrophotometer and Hall effect et al. The results of Hall effect measurement show that nitrogen-doping can increase the hole concentration by one order of magnitude.The band gap width decreases with the increase of nitrogen flow rate.The nitrogen in Cu2O is in three forms: β-N(nitrogen atom), α-N2(molecular nitrogen, —N=N—)and γ-N2(molecular nitrogen, N≡N).With the increase of nitrogen gas flow rate, the peak of binding energy of β-N increases while that of α-N2 decreases.The sample prepared at the nitrogen flow rate of 2.0 sccm has the minimum resistivity among all samples.

引言
1 实验
2 结果与讨论
3 结语

$图1 所有样品的XRD图谱<br/>Fig.1 (Color online)X-ray diffraction patterns of all samples$

图1 所有样品的XRD图谱
Fig.1 (Color online)X-ray diffraction patterns of all samples

图2 纯相Cu2O样品的SEM图<br/>Fig.2 SEM images of the phase-pure Cu2O samples

图2 纯相Cu2O样品的SEM图
Fig.2 SEM images of the phase-pure Cu2O samples

图3 纯相氧化亚铜样品的拉曼图谱<br/>Fig.3 (Color online)Raman patterns of the phase-pure Cu2O samples

图3 纯相氧化亚铜样品的拉曼图谱
Fig.3 (Color online)Raman patterns of the phase-pure Cu2O samples

表1 纯相氧化亚铜样品的霍尔测量结果<br/>Table 1 Hall measurement results of the phase-pure Cu2O samples

表1 纯相氧化亚铜样品的霍尔测量结果
Table 1 Hall measurement results of the phase-pure Cu2O samples

图4 纯相氧化亚铜样品的Tauc图<br/>Fig.4 (Color online)The Tauc plots of the phase-pure Cu2O samples

图4 纯相氧化亚铜样品的Tauc图
Fig.4 (Color online)The Tauc plots of the phase-pure Cu2O samples

图5 N2流量为2.0 sccm时样品中Cu和O的高分辨率能谱<br/>Fig.5 (Color online)The high resolution bonding energy spectra of Cu and O in the sample prepared with N2 flow of 2.0 sccm

图5 N2流量为2.0 sccm时样品中Cu和O的高分辨率能谱
Fig.5 (Color online)The high resolution bonding energy spectra of Cu and O in the sample prepared with N2 flow of 2.0 sccm

图6 N元素的高分辨率能谱<br/>Fig.6 (Color online)The high resolution bonding energy spectra of N

图6 N元素的高分辨率能谱
Fig.6 (Color online)The high resolution bonding energy spectra of N

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备注

引言

1 实验

2 结果与讨论

3 结语

期刊信息

备注

引言

1 实 验

2 结果与讨论

3 结 语

期刊信息

1 实验

3 结语