Inorganic perovskite photodetector with chromium interdigitated electrodes is investigated. The active material is a solution processed CsPbI3 synthesized by one step deposition. The α-phase of this material is unstable at room temperature and it converts to the δ-phase at temperatures below 320°C. The stabilization of the α-phase was conducted in nitrogen environment by adding 5% weight ratio of polyethylene oxide to the equimolar mixture of PbI2 and CsI in dimethyl sulfoxide. The absorbance spectrum of the CsPbI3 with polyethylene oxide showed the emergence of a second peak at ∼ 690 nm related to the α-phase in addition to the peak at 420 nm of the δ phase. The peak in the visible range was also observed in the μ-photoluminescence spectrum at 690 nm. The interdigital structure was prepared by photolithography method to deposit 80 nm of chromium interdigitated electrodes on glass substrate with 10 μm channel width. The detector's on/off ratio and the detectivity were calculated from the current voltage curve under 100 mW/cm2 to be 9.64×103 and 9.2×109 Jones respectively.
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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