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	掺镁氧化铁电极光响应n-p型转换的研究; THE INVESTIGATION ON INVERSION OF n-TYPE TO p-TYPE PHOTORESPONSES OF MAGNESIUM-DOPED IRON OXIDE ELECTRODE
	蔡生民 ; 陆坦 ; 周牧易
	1987
关键词	n-p 工业纯铁 分析纯 极则 电压响应 铁片 表面结构分析 空间电荷区 支持电解质 过补偿
英文摘要	热形成氧化铁一般为n型光响应,掺Mg后有可能为p型。本文作者之一曾报导用涂敷方法制备的以Pt为基底的氧化铁膜随电极电势向负向移动,光响应由n型转为p型,但末作进一步研究。我们用工业纯铁制成的氧化铁电极则始终表现为n型光响应,原因可能是含Si0.005％所致。在本文中我们将工业纯铁片和分析纯MgO粉末直接接触,加热。在一定条件下可以得到具有n、p型双重光响应。溶液为硼酸、硼砂缓; Electrodes were prepared with heating commercial pure iron ships buried in Mao powder and showed both n-and p-type photoresponses, The photoresponses were so weak that in fact they were totally buried in the noise. Hence a signal averager was used. After 1000 cycles' summation the signal to noise ratio was greatly improved and we obtained a wave form series showing the conversion of n-type, p-type photoresponses for the first time. Fig. 1(a), E = 0.261V. The absolute peak-to-peak photovoltagr value (Delta V-ph) equals 13.4mV and shows a tvnical n-type photoresponse. (b) E= -0.04V, Delta V-ph=1.24mV, still an n-type response, but when light is chopped off, the electrode potential reaches its stable value much faster than in (a), (0: When E = -0076V, which is only 0.036V more negative than in (b), in the latter 85% part of illaminating period, electrode potential tends to increase, demonstrating some p-type character. (d), As E = 0.09V the magnitude of p-type response almost equals that of n-type. (e), As E = -0.12V, the main response belongs to p-type, and Delta V-ph. is only 0.634mV. This electrode potential is much more positive than the flat band potential of the undoped iron oxide electrode (E-rs is about -0.5V). (f), E = -0.17V, There is still a small n-type response at the beginning of every illuminating period, and the whole curve appears to be p-type responnse.(g), E = -0,36V. Typical p-type response appears. Delta V-ph =2.05mV. (h) and (i), E = -0.40V and -0.45V. Delta V-ph drop to 1.55mV and 1.05mV respectively, the above data were reproducible, no retardation of photoreaponse was observed when potential was changed. An XPS surface analysis was performed thereafter on the same electrode. A peak of Mg1S at 1305eV(BE) is apparent, Huge amount of Mg exists on the surface layer, the relative atomic concentration (as compared with Fe) reaches 15-20 AT%. After Ar+ etching, the amount of Mg decreases. Fig.2 is the result after minutes' Ar+ etching,A possible explanation of these experimental facts based on model of energy band of semiconductors was given.; SCI(E); 3; 01; 1-3; 3
语种	中文
出处	SCI ; 知网
出版者	物理化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/78667]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	蔡生民,陆坦,周牧易. 掺镁氧化铁电极光响应n-p型转换的研究, THE INVESTIGATION ON INVERSION OF n-TYPE TO p-TYPE PHOTORESPONSES OF MAGNESIUM-DOPED IRON OXIDE ELECTRODE. 1987-01-01.

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