Speaker
Description
Two-dimensional (2D) perovskite thin films have recently emerged as efficient direct photocurrent detectors, owing to their strong light absorption, fast charge separation, and intrinsically low dark currents. When integrated onto planar interdigitated pixel electrodes, flexible PEA₂PbBr₄ films exhibit stable operation and extremely low noise (~10 pA at 4 kV/mm), enabling sensitive photocurrent measurements across a broad spectral range, including ultraviolet, X-ray, and clinically relevant γ photons. To further validate their potential, we extend their operation to single-particle detection: alpha particle signals (²⁴¹Am, 5.5 MeV) are resolved down to single-pulse events, serving as a proof of principle toward single-photon sensitivity. Comparative analysis with single-crystal counterparts yields mobility–lifetime products of μτ ≈ 10⁻⁶ cm²/V for thin films versus ≈10⁻⁵ cm²/V for single crystals, consistent with literature benchmarks. These results highlight the versatility of 2D perovskite thin films, validating their operation as direct photocurrent detectors from ultraviolet photons to energetic particles, and positioning them as scalable platforms capable of advancing toward single-photon sensitive detection.
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