Developing cold-resistant high-adhesive electronic substrate for WIMPs detectors at CDEX

doi:10.1088/1674-1056/ab718a

Abstract Herein we report a prototypical electronic substrate specifically designed to serve the weakly interacting massive particles (WIMPs) detectors at the China Dark Matter Experiment (CDEX). Because the bulky high-purity germanium (HPGe) detectors operate under liquid-nitrogen temperatures and ultralow radiation backgrounds, the desired electronic substrates must maintain high adhesivity across different layers in such cold environment and be free from any radioactive nuclides. To conquer these challenges, for the first time, we employed polytetrafluoroethylene ((C₂F₄)_n) foil as the base substrate, in conjunction with ion implantation and deposition techniques using an independently developed device at Beijing Normal University for surface modification prior to electroplating. The remarkable peeling strengths of 0.88±0.06 N/mm for as-prepared sample and 0.75±0.05 N/mm for that after 2.5-days of soaking inside the liquid nitrogen were observed, while the regular standards commonly require 0.4 N/mm～ 0.6 N/mm for electronic substrates.

Keywords: WIMPs detector CDEX surface modification electronic substrate

Received: 31 December 2019
Revised: 22 January 2020
Accepted manuscript online:

PACS:	52.77.Dq	(Plasma-based ion implantation and deposition)
	95.35.+d	(Dark matter)
	07.20.Mc	(Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)

Fund: Project supported by the Central University Basic Scientific Research Business Expenses Special Funds under the project name of Research on Applied Physics under Low Radiation Background (Grant No. 2018NTST07) and the National Natural Science Foundation Joint Fund Key Project, China (Grant No. U1865206).

Corresponding Authors: Bin Liao, Bin Wu
E-mail: liaobingz@bnu.edu.cn;bwu6@bnu.edu.cn

Cite this article:

Yuanyuan Liu(刘圆圆), Jianping Cheng(程建平), Pan Pang(庞盼), Bin Liao(廖斌), Bin Wu(吴彬), Minju Ying(英敏菊), Fengshou Zhang(张丰收), Lin Chen(陈琳), Shasha Lv(吕沙沙), Yandong Liu(刘言东), Tianxi Sun(孙天希) Developing cold-resistant high-adhesive electronic substrate for WIMPs detectors at CDEX 2020 Chin. Phys. B 29 045203

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