Specific Process Knowledge/Etch/ASE (Advanced Silicon Etch)

Common parameters		Multiplexed parameters
Parameter	Setting	Parameter	Etch	Pass
Temperature	10oC	SF6 Flow	230 sccm	0 sccm
No. of cycles	31	O2 Flow	23 sccm	0 sccm
Process time	5:56 mins	C4F4 Flow	0 sccm	120 sccm
APC mode	manual	Ar Flow	0 sccm	0 sccm
APC setting	86.8 %	RF coil	2800 W	1000 W

The ICP-DRIE (Inductively Coupled Plasma - Deep Reactive Ion Etcher) tool at Danchip is manufactured by STS and is called the ASE (Advanced Silicon Etcher). The main purpose of the ASE is etching of silicon using Bosch process.

The Bosch process:

The Bosch process uses alternation between an etch cycle and a passivation cycle. In the case of the silicon etching on the ASE, an etch phase with SF₆ and O₂ alternates with a passivation phase with C₄F₈.

Two recipes have been optimized for the ASE: A shallow etch shallolr and a deep etch deepetch.