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Performance of a TiN-coated monolithic silicon pin-diode array under mechanical stress

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arxiv 1202.0320 v1 pith:UPDO5Q3X submitted 2012-02-01 physics.ins-det nucl-ex

Performance of a TiN-coated monolithic silicon pin-diode array under mechanical stress

classification physics.ins-det nucl-ex
keywords detectorpin-diodesiliconarraymechanicalpinspogostress
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Karlsruhe Tritium Neutrino Experiment (KATRIN) will detect tritium beta- decay electrons that pass through its electromagnetic spectrometer with a highly- segmented monolithic silicon pin-diode focal-plane detector (FPD). This pin-diode array will be on a single piece of 500-{\mu}m-thick silicon, with contact between titanium nitride (TiN) coated detector pixels and front-end electronics made by spring-loaded pogo pins. The pogo pins will exert a total force of up to 50N on the detector, deforming it and resulting in mechanical stress up to 50 MPa in the silicon bulk. We have evaluated a prototype pin-diode array with a pogo-pin connection scheme similar to the KATRIN FPD. We find that pogo pins make good electrical contact to TiN and observe no effects on detector resolution or reverse-bias leakage current which can be attributed to mechanical stress.

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