Perovskite-based semiconductors,
such as methylammonium and cesium
lead halides (MPbX3: M = CH3NH3
+ or Cs+; X = I–, Br–, or Cl–), have attracted immense attention for
several applications, including radiation detection, due to their
excellent electronic and optical properties.1,2,3,4,5,6 In addition, the combination of perovskites with other materials
enables unique device structures. For example, robust and reliable
diodes result when combined with metal oxide semiconductors. This
device can be used for detection of nonionizing and ionizing radiation.
In this paper, we report a unique perovskite single-crystal-based
neutron detector using a heterojunction diode based on single-crystal
MAPbBr3 and gallium oxide (Ga2O3)
thin film. The MAPbBr3/Ga2O3 diodes
demonstrate a leakage current of ∼7 × 10–10 A/mm2, an on/off ratio of ∼102, an
ideality factor of 1.41, and minimal hysteresis that enables alpha
particle, gamma-ray, and neutron detection at a bias as low as (−5
V). Gamma discrimination is further improved by 85% by optimizing
the thickness of the perovskite single crystal. The MAPbBr3/Ga2O3 diodes also demonstrate a neutron detection
efficiency of ∼3.92% when combined with a 10B neutron
conversion layer.
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