  A long-standing limitation of semiconductor neutron detectors is the lack of
a scalable solution to make large area instruments. Neutron detectors are used
in a wide range of applications, including the nuclear industry, safeguarding
radioactive material, neutron imaging, non-destructive testing, understanding
space weather effects on commercial electronics used in aviation, and for
fundamental science such as nuclear and particle physics. Here we demonstrate
that a solution processed organic semiconductor technology, which is scalable,
can solve this aproblem. We have demonstrated detection of fast neutrons from
monoenergetic beams (energies 0.565 and 16.5 MeV), from AmBe sources, and
thermal energy (0.025 eV) in devices sensitised with B-10 enriched B_4C. This
energy range is of interest for many of the applications listed above. The
detector response is found to be linear with flux up to 1.5 x 10^7 n/cm^2/s. As
organic semiconductors are a similar density to human tissue, this technology
may be of interest for medical physics applications, for example B neutron
capture therapy dose monitoring and understanding neutron interactions in human
tissue.
