Electrophoretic Deposition of ¹⁰B Nano/Micro Particles in Deep Silicon Trenches for the Fabrication of Solid State Thermal Neutron Detectors

Abstract

We present a cost effective and scalable approach to fabricate solid state thermal neutron detectors. Electrophoretic deposition technique is used to fill deep silicon trenches with 10 B nanoparticles instead of conventional chemical vapor deposition process. Deep silicon trenches with width of 5-6 μm and depth of 60-65 μm were fabricated in a p-type Si (110) wafer using wet chemical etching method instead of DRIE method. These silicon trenches were converted into continuous p-n junction by the standard phosphorus diffusion process. 10 B micro/nano particle suspension in ethyl alcohol was used for electrophoretic deposition of particles in deep trenches and iodine was used to change the zeta potential of the particles. The measured effective boron nanoparticles density inside the trenches was estimated to be 0.7 gm cm -3 . Under the self-biased condition, the fabricated device showed the intrinsic thermal neutron detection efficiency of 20.9% for a 2.5  2.5 mm 2 device area.

Nanometer-Sized Boron Loaded Liposomes Containing Fe3O4 Magnetic Nanoparticles and Tributyl Borate and Anti-Albumin from Bovine Serum Antibody for Thermal Neutron Detection

“…For instance, Zheng [ 10 ] reported a direct conversion solid-state neutron detector by combining the B-10 with sub-2 nm Pt nanoparticles. Koirala [ 11 ] placed B-10 nano/micro particles in channels of silicon semiconductors by electrophoretic deposition to detect thermal neutrons. Amaro [ 12 ] proposed a proportional counter filled with B-10 nanoparticle aerosol for neutron detection.…”