Abstract

A visible light photodetector made of CsPbBr3 thin film prepared by solution process method was fabricated using a chromium interdigital structure. The device consists of two interdigitated electrodes deposited on glass substrate with 10 μm channel width filled with CsPbBr3. The material was characterized by using absorbance, μ-photoluminescence (μ-PL), and X-ray spectroscopies. The PL peak was observed at 528 nm (2.35 eV). The detector was characterized by using the spectral response, current-voltage (I–V) characteristic, and time response measurements. The photocurrent of the device was observed to be about two orders of magnitude higher than the dark currents. The detectivity was extracted from the I–V measurements to be 2.67 × 109 cm Hz−2W at 5 V bias voltage. The spectral response measured at room temperature exhibited a peak located at 518 nm, which is in good agreement with the absorbance peak. The detectivity was monitored over a period of five weeks and it was observed to decrease by ∼30%.

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