摘要:
In manufacturing a CVD film (interlayer insulating film or passivation film) using material gases containing a gas having Si--H combination, the amount of Si--H combination in the CVD film (12, 31, 32, 33, 34, 47, 48, 49, 57, 59) is set to 0.6.times.10.sup.21 cm.sup.-3 or less to thereby suppress the formation of electron traps in the gate oxide film or tunnel oxide film and prevent variations in the threshold of transistors. In addition, the moisture resistance can be improved by setting the refractive index of the CVD film to 1.65 or more or by setting the concentration of nitrogen in the CVD film to 3.times.10.sup.21 cm.sup.-3 or more.
摘要:
A memory cell of EEPROM having a floating gate, a control gate, a drain region, and a source region is formed on a silicon substrate. Thereafter, a BPSG film (interlayer insulating film) covering the memory cell is formed by CVD. After a wire including a bit line, an SiON film (passivation film), covering the silicon substrate and serving as an uppermost layer, is formed on an upper portion of the silicon substrate. Thereafter, annealing is performed to discharge water in the BPSG film to an outer portion of an LSI. The annealing is performed under a condition satisfying the following equation of t≧7.86×10−11×L2×exp (9115/T) where t is anneal time (minutes), L is a thickness (nm) of the passivation film, and T is anneal temperature (absolute temperature). Thereby, an amount of electronic trap in a gate oxide film of the transistor can be reduced.