Mixed 3D-2D Perovskite Flexible Films for the Direct Detection of 5 MeV Protons

This study reports on a novel, flexible, proton beam detector based on mixed 3D-2D perovskite films deposited by solution onto thin plastic foils. The 3D-2D mixture allows to obtain micrometer-thick and highly uniform films that constitute the detector's active layer. The devices demonstrate excellent flexibility with stable electric transport properties down to a bending radius of 3.1 mm. The detector is characterized under a 5 MeV proton beam with fluxes in the range [4.5 × 10⁵ - 1.4 × 10⁹ ] H⁺ cm^-2 s^-1 , exhibiting a stable response to repetitive irradiation cycles with sensitivity up to (290 ± 40) nC Gy^-1 mm^-3 and a limit of detection down to (72±2) µGy s^-1 . The detector radiation tolerance is also assessed up to a total of 1.7 × 10¹² protons impinging on the beam spot area, with a maximum variation of the detector's response of 14%.