Boron-Doped Single-Crystal Diamond: Boosting the Sensitivity of Neutron Detection

Diamond is not only the hardest material in nature, but also possesses properties such as high temperature resistance, radiation resistance, and fast electrical conductivity.

Radiation resistance: It has an ultra-wide band gap (5.5 eV), enabling resistance to radiation damage;

Excellent heat resistance: It can still work stably in an environment of 450°C, which is far beyond the limit of silicon;

Extremely fast response speed: The carrier mobility exceeds 4500 cm²/V·s, which is 3 times faster than that of silicon;

Carbon atoms are "sensitive" to neutrons and can accurately capture their trajectories.

The stacked design of boron-doped/undoped diamond addresses the key issue of weak signals in polycrystalline diamond:

(1) Principle: Boron atoms form "hole traps" that capture alpha particles induced by neutrons. The stacked structure enables efficient signal collection, significantly enhancing sensitivity.

Breakthrough: It allows large-area fabrication, leading to a substantial reduction in cost.

From volcanic craters to nuclear reactors, and from deep space to security checkpoints, diamond detectors—thanks to their durable, sensitive, and stable properties—are rewriting the rulebook for detection in extreme environments.

The boron-doped single-crystal diamond produced by CSMH can achieve doping from low concentration to high concentration. It has realized a uniform and controllable concentration and a customizable boron doping process.CSMH uses the MPCVD method to prepare large-sized and high-quality diamonds,and currently has mature products such as diamond heat sinks, diamond wafers, diamond windows,diamond hetero junction integrated composite substrates,etc.