High-performance visible light photodetectors based on inorganic CZT and InCZT single crystals
EntityUAM. Departamento de Física de Materiales
PublisherNature Publishing Group
10.1038/s41598-019-48621-3Scientific Reports 2019.9 (2019): 12436
Funded byAuthors from KKU express their appreciation to the Deanship of Scientifc Research at King Khalid University for funding this work through research groups program under grant number R.G.P. 2/42/40
SubjectsPhotogating efect; CZT photodetector; Cadmium zinc telluride (CZT); Single crystals-based photodetectors; Física
Rights© 2019, The Author(s)
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
Herein, the optoelectrical investigation of cadmium zinc telluride (CZT) and indium (In) doped CZT (InCZT) single crystals-based photodetectors have been demonstrated. The grown crystals were configured into photodetector devices and recorded the current-voltage (I-V) and current-time (I-t) characteristics under different illumination intensities. It has been observed that the photocurrent generation mechanism in both photodetector devices is dominantly driven by a photogating effect. The CZT photodetector exhibits stable and reversible device performances to 632 nm light, including a promotable responsivity of 0.38 AW−1, a high photoswitch ratio of 152, specific detectivity of 6.30 × 1011 Jones, and fast switching time (rise time of 210 ms and decay time of 150 ms). When doped with In, the responsivity of device increases to 0.50 AW−1, photoswitch ratio decrease to 10, specific detectivity decrease to 1.80 × 1011 Jones, rise time decrease to 140 ms and decay time increase to 200 ms. Moreover, these devices show a very high external quantum efficiency of 200% for CZT and 250% for InCZT. These results demonstrate that the CZT based crystals have great potential for visible light photodetector applications
Google Scholar:Shkir, Mohd - Khan, Mohd Taukeer - Ashraf, I. M. - Almohammedi, Abdullah - Dieguez, E. - AlFaify, S.
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