Hybrid-Contact Planar HPGe Process Vehicle Toward Ring-Contact Designs
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911374548926464 |
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| author | Dong, Kunming Mei, Dongming Panamaldeniya, Shasika Karki, Anupama Burns, Patrick Bhataarai, Sanjay |
| author_facet | Dong, Kunming Mei, Dongming Panamaldeniya, Shasika Karki, Anupama Burns, Patrick Bhataarai, Sanjay |
| contents | Rare-event searches including dark matter, coherent elastic neutrino--nucleus scattering (CE$ν$NS), and neutrinoless double-beta decay (0$νββ$) require high-purity germanium (HPGe) detectors with ultralow noise, stable backgrounds, and electrode geometries that can scale to larger single-crystal masses. Ring-contact (ring-and-groove) designs address scalability by shaping the electric field to preserve low-capacitance readout, but their nonplanar topology motivates a lithium-contact process that is compatible with conformal deposition and robust high-voltage operation. As a process demonstration toward future ring-contact prototypes, we fabricate and characterize a hybrid-contact planar HPGe device, KL01. Here, ``hybrid'' denotes an $n^{+}$ contact formed by an in-house lithium-suspension paint followed by controlled thermal diffusion, combined with an AJA-developed a-Ge/Al $p^{+}$ contact and a-Ge sidewall passivation. At 77~K the device exhibits pA-scale leakage current under kV bias, a depletion plateau near $V_{\mathrm{dep}}\approx 1300$~V, and energy resolutions of 1.57~keV FWHM at 59.5~keV and 2.57~keV FWHM at 662~keV. These results validate the compatibility of the paint-and-diffuse lithium process with thin-film a-Ge/Al contacts and establish a practical fabrication workflow to be extended to ring-and-groove electrodes for next-generation rare-event HPGe modules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08934 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Hybrid-Contact Planar HPGe Process Vehicle Toward Ring-Contact Designs Dong, Kunming Mei, Dongming Panamaldeniya, Shasika Karki, Anupama Burns, Patrick Bhataarai, Sanjay Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment Rare-event searches including dark matter, coherent elastic neutrino--nucleus scattering (CE$ν$NS), and neutrinoless double-beta decay (0$νββ$) require high-purity germanium (HPGe) detectors with ultralow noise, stable backgrounds, and electrode geometries that can scale to larger single-crystal masses. Ring-contact (ring-and-groove) designs address scalability by shaping the electric field to preserve low-capacitance readout, but their nonplanar topology motivates a lithium-contact process that is compatible with conformal deposition and robust high-voltage operation. As a process demonstration toward future ring-contact prototypes, we fabricate and characterize a hybrid-contact planar HPGe device, KL01. Here, ``hybrid'' denotes an $n^{+}$ contact formed by an in-house lithium-suspension paint followed by controlled thermal diffusion, combined with an AJA-developed a-Ge/Al $p^{+}$ contact and a-Ge sidewall passivation. At 77~K the device exhibits pA-scale leakage current under kV bias, a depletion plateau near $V_{\mathrm{dep}}\approx 1300$~V, and energy resolutions of 1.57~keV FWHM at 59.5~keV and 2.57~keV FWHM at 662~keV. These results validate the compatibility of the paint-and-diffuse lithium process with thin-film a-Ge/Al contacts and establish a practical fabrication workflow to be extended to ring-and-groove electrodes for next-generation rare-event HPGe modules. |
| title | Hybrid-Contact Planar HPGe Process Vehicle Toward Ring-Contact Designs |
| topic | Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2601.08934 |