“…8 There are four types of self-assembly masks: metal, nanospheres, copolymer, and deliquescent salts. Metal nanodots (Ag) 9 can easily contaminate substrates and are hard to remove, diversified inorganic (silica) 10 and organic (colloids) 11 nanospheres tend to agglomerate, copolymer micells' 12 diameter is limited, while deliquescent salt masks have the advantages of easy mask removing, high etch selectivity, high coverage, wide diameter range and compatibility. CsCl is one of such deliquescent salts and it's easy to acquire.…”