SBOK097B April 2025 – June 2025 TMP9R01-SEP
The TMP9R01-SEP is fabricated in the TI Linear BiCMOS 180-nm process with a back-end-of-line (BEOL) stack consisting of 3 levels of standard thickness aluminum metal on a 0.6μm pitch. The total stack height from the surface of the passivation to the silicon surface is 3.825μm based on nominal layer thickness as shown in Figure 4-1. Accounting for energy loss through the 1mil thick Aramica beam port window, the 40mm air gap, and the BEOL stack over the TMP9R01-SEP, the effective LET (LETEFF) at the surface of the silicon substrate, the depth, and the ion range was determined with the SEUSS 2020 Software (provided by the Texas A&M Cyclotron Institute and based on the latest SRIM-2013 models). The stack was modeled as a homogeneous layer of silicon dioxide (valid since SiO2 and aluminum density are similar). At MSU, the LETEFF reported is the surface-level LET.