超导薄膜实现布图布线工艺是制备超导电子元件的必要步骤.报道了两种二硼化镁超导薄膜布图布线的湿法刻蚀技术:一种是先利用双氧水( H2O2)刻蚀前驱体硼薄膜,然后将刻蚀的样品放入钽坩埚中在镁蒸气下高温退火,实现了对超导薄膜二硼化镁(MgB2)布图布线的刻蚀；另一种是选用氢氟酸(HF)和硝酸(HNO3)的混合溶液直接在二硼化镁超导薄膜上进行图形刻蚀.通过上述两种方法刻蚀出的MgB2薄膜图形精确度高,超导转变温度Tc都在38K以上,临界电流Ic约为1×106 A/cm2.
Effectively patterning of MgB2 thin film is a very critical step to the application of superconducting films in superconducting electronics.Two patterning techniques for superconductive MgB2 films by wet etching were presented.In the first technique the precursor boron films were patterned by using H2O2 as etchant.Then the samples were annealed in magnesium vapor in a tantalum crucible,and the patterned boron films were transformed to superconducting MgB2 films.In the second technique the MgB2 films were patterned directly by a mixture of hydrofluoric acid (HF) and nitric acid (HNO3) solutions.The patterned MgB2 films with rather high resolution were fabricated successfully by using above techniques.The transition temperature (Tc) of the patterned MgB2 films is around 38K and critical current density (Ic) is about 1 × 106 A/cm2.
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