Three-interface pseudo-MOSFET models for the characterization of SOI wafers with ultrathin film and BOX
The electrical characterization of unprocessed fully depleted silicon-on-insulator (SOI) layers relies on the pseudo-MOSFET (?-MOSFET) technique. We propose three-interface models which are more appropriate for addressing the case of SOI wafers with ultrathin body and BOX (UTB2). The novel models for threshold voltage and subthreshold swing account for the channel-to-surface and channel-to-substrate coupling which are important effects, respectively, in ultrathin films and thin BOX. The influence of the density of traps at each of the three interfaces (free surface, channel/BOX and BOX/substrate) is discussed. The models are validated with experimental results from a range of SOI film thicknesses.
silicon-on-insulator (soi) pseudo-mosfet (?-mosfet) threshold voltage coupling effects material qualification poisson equation semiconductor device models