申请人:National Institute of Advanced Industrial Science
and Technology
公开号:EP1760769A1
公开(公告)日:2007-03-07
A dry etching gas comprising a C4-6 fluorine compound which has an ether bond or carbonyl group and one or more fluorine atoms in the molecule and is constituted only of carbon, fluorine, and oxygen atoms and in which the ratio of the number of fluorine atoms to the number of carbon atoms (F/C) is 1.9 or lower (provided that the compound is neither a fluorine compound having one cyclic ether bond and one carbon-carbon double bond nor a saturated fluorine compound having one carbonyl group); a mixed dry etching gas comprising the dry etching gas and at least one gas selected from the group consisting of rare gases, O2, O3, CO, CO2, CHF3, CH2F2, CF4, C2F6, and C3F8; and a method of dry etching which comprises converting either of these dry etching gases into a plasma and processing a semiconductor material with the plasma. The dry etching gases can be safely used, are reduced in influence on the global environment, and can highly selectively dry-etch a semiconductor material at a high dry etching rate to form a satisfactory pattern shape. The dry etching method employs either of these dry etching gases.
一种干蚀刻气体,包括一种C4-6氟化合物,其分子中具有一个醚键或羰基和一个或多个氟原子,且仅由碳、氟和氧原子构成,其中氟原子数与碳原子数之比(F/C)为1.9 或更低(条件是该化合物既不是具有一个环醚键和一个碳碳双键的氟化合物,也不是具有一个羰基的饱和氟化合物);一种混合干蚀刻气体,包括干蚀刻气体和至少一种选自稀有气体、O2、O3、CO、CO2、CHF3、CH2F2、CF4、C2F6 和 C3F8 组成的组的气体;以及一种干蚀刻方法,该方法包括将上述任一种干蚀刻气体转化为等离子体,并用该等离子体处理半导体材料。干蚀刻气体可以安全使用,对全球环境的影响较小,并能以较高的干蚀刻速率高度选择性地对半导体材料进行干蚀刻,以形成令人满意的图案形状。干蚀刻方法采用上述任何一种干蚀刻气体。