Amorphous, Silicon-Based Neutron Detector

73209S03-I Various large-scale neutron sources, including those already built or to be constructed, are important for materials and life science research. For all these neutron sources, neutron detectors are a very important aspect. However, a high-performance and low-cost neutron beam monitor, that provides time and temporal resolution, is lacking. This project will develop a pixilated, reliable, durable, fully-packaged neutron detector. The device will be based on an amorphous silicon material, will use a double-junction p-i-n/n-i-p design to provide X-Y pixilation, and will be fabricated using a high-yield, low-cost method. Phase I will fabricate a proof-of-concept neutron beam monitor for neutron detection, using ECVD/Evaporation/Sputtering for various semiconductor junction and metal contacting layers. A boron layer will be evaporated on top of the layered structure to convert neutrons into alpha particles, which could be detected by a Si-based p-i-n diodes. Commercial Applications and Other Benefits as described by awardee: The technology should lead to a high-performance, low-cost, X-Y pixilated neutron beam monitor that could be used in all neutron facilities worldwide. In addition, the technology could be used to develop X-ray and neutron monitors for future use in security checks at airports and other critical facilities.