In our effort to fabricate arrays of germanium microcalorimeters for X-ray detection, a truncated square-based pyramid shape has been identified as a suitable geometry for the sensors. It allows to obtain a uniform current spreading across each sensor, and represents a good compromise between having a large support area for the radiation absorber and for maintaining an overall small bolometer volume. This three-dimensional geometry, however, does not allow to create the electrical contacts for the sensors using a regular photoresist-based lift-off metallization process. In this paper we show how to deposit metal contacts on the lateral faces of the pyramidal sensors by metal evaporation through a butterfly shaped shadow mask, made of a five microns thick free-standing microstructured copper film. The process to fabricate the shadow mask, using microlithography and electrodeposition techniques, is also described.
|Numero di pagine||6|
|Rivista||Journal of Low Temperature Physics|
|Stato di pubblicazione||Published - 2012|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics
Arnone, C., Lullo, G., Barbera, M., Lo Cicero, Collura, & Barbera (2012). Fabrication of Electrical Contacts on Pyramid-Shaped NTD-Ge Microcalorimeters Using Free-Standing Shadow Masks. Journal of Low Temperature Physics, 167, 541-546.