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 Thermal formation of iron oxide is generally n-type photoresponse, doped with Mg may be p-type. The authors of this paper have reported that the Pt-based iron oxide film prepared by the coating method moves in a negative direction with the electrode potential and the photoresponse changes from n-type to p-type, but this is not studied further. Our iron oxide electrodes made of industrial pure iron always show an n-type photoresponse, probably due to the inclusion of 0.005% Si. In this paper, we will industrial pure iron sheet and the analysis of pure MgO powder direct contact, heating. Under certain conditions can be obtained with n, p-type double light response. Boric acid solution, borax slowly