Samarium isotope minisize cell and manufacturing method thereof

Abstract

The invention discloses a samarium isotope minisize cell and a manufacturing method thereof. The cell is formed by a transduction unit and an appurtenance. The transduction unit comprises: samarium-151 radioactive source sheet, a Si3N4 layer and a silicon-based PN junction. The appurtenance comprises: an outer encapsulation layer, a ring electrode, a positive lead, a positive electrode, a gold layer, a pedestal, a negative electrode, a negative lead, a ceramic chip and an inner encapsulation layer. The Si3N4 layer is located on an upper surface of the silicon-based PN junction. The ring electrode is on an epitaxy of the Si3N4 layer. The samarium-151 radioactive source sheet is fixed on the upper surface of the Si3N4 layer by using the inner encapsulation layer. A lower surface of the silicon-based PN junction is the gold layer. One end of the negative lead is connected with the gold layer and the other end is connected with the negative electrode. One end of the positive lead is connected with the ring electrode and the other end is connected with the positive electrode. The ceramic chip is located below the gold layer. The ceramic chip is located on the very center of the pedestal. The outer encapsulation layer covers the outside of the pedestal. The samarium isotope minisize cell of the invention has a small size and can work without energy provided from the outside. The cell can continuously output a 100nA-muA current and 0.1muA-1muA for more than 45 years. The manufacturing method of the invention is safe and reliable.

Description

technical field [0001] The invention belongs to the field of micro-isotope batteries, in particular to a samarium isotope micro-battery and a preparation method thereof. Background technique [0002] During the decay process, radioactive isotopes will spontaneously emit particles (such as α, β, γ particles, etc.), and these particles contain a certain amount of energy, which is called decay energy. An isotope battery is an energy supply device that converts this decay energy directly or indirectly into electrical energy. [0003] There are more than 10 mechanisms by which isotope batteries convert decay energy into electrical energy. However, in the production of micro batteries, isotope batteries of many mechanisms cannot take into account the three requirements of small size, long life and maintenance-free. Since the late 1990s, under the traction of MEMS / NEMS and other micro / nano system airborne power requirements, and with the rapid development of isotope application t...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing technical 3 H or 63 Ni isotope micro-battery output power is too small, short-circuit current is too low, the invention provides a samarium isotope micro-battery and its preparation method

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