A Low-Leakage Gallium Phosphide Particle Detector

基于在第一阶段项目中成功展示的低泄漏、室温探测器性能，AstroPower公司提出进一步开发用于室温或更高工作条件下核粒子探测的磷化镓探测器。第二阶段的项目将专注于开发和整合第一阶段的发现到高性能探测器中。将开发的探测器设计可用于三种不同的室温设备配置：(i)单结低能光谱仪或高能相遇，（ii）单结薄{SYMBOL 68 \f“SYMBOL”}{SYMBOL 69 \f“SYMBOL”}探测器，以及（iii）多结中高能谱仪。这些器件需要外延生长技术的发展，以产生高电阻率，高晶体完美的厚层，以及产生高二极管击穿电压的加工技术的发展。其中一个重要的目标是确定GaP的具体能量范围能力。预计在恶劣环境下，磷化镓将成为硅和锗的优良替代品，用于宽能量范围的质子、α粒子和光子。

9303764 Collins Based on the low leakage, room temperature detector performance demonstrated in a successful Phase I program, AstroPower is proposing further development of gallium phosphide detectors for nuclear particle detection under operating conditions of room temperature or above. The Phase II program will focus on developing and integrating the Phase I findings into high performance detectors. The detectors designs that will be developed can be used in three different room temperature device configuration: (i) a single junction low energy spectrometer or high energy encounter, (ii) a single junction, thin {SYMBOL 68 \f "Symbol"}{SYMBOL 69 \f "Symbol"} detectors, and (iii) a multiple junction medium to high energy spectrometer. These devices require the development of epitaxial growth techniques that yield high resistivity, thick layers with high crystalline perfection, and the development of processing techniques that yield high diode breakdown voltages. An important objective of this is to determine the specific energy range capabilities of GaP. It is expected that gallium phosphide will be a superior replacement for silicon and germanium for a wide energy range of protons, alpha particles and photons in harsh environments.