Ramar, M. and Kajal, S. and Pal, Prabir and Srivastava, R. and Suman, C. K. (2015) Study of binary and ternary organic hybrid CdSe quantum dot photodetector. Applied Physics A: Materials Science and Processing, 120 (3). 1141 -1148. ISSN 0947-8396

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The hybrid binary and ternary photodetectors (PDs) were fabricated from P3HT-PC71BM with CdSe quantum dot (QD) materials. The absorption spectra of P3HT:PC71BM (named as B1), P3HT:CdSe (B2) and P3HT:CdSe:PC71BM (T) active blended material were analyzed in the wavelength range from 350 to 800 nm. The current density-voltage characteristics of the device were measured in dark and under illumination for study of detector detectivities and the contact with electrode. The ratio at -0.5 V for PDs B1, B2 and T is 1.1 x 10(2), 1.9 x 10(2) and 1.8 x 10(3), respectively. The values of detectivity for B1, B2 and T are 1 x 10(10), 2 x 10(10) and 7 x 10(11) Jones, respectively. The for PD T is ten times in comparison with B1 and B2 PDs. The linear dynamic range (LDR) value for ternary device is more than double to both binary PDs. The absorption by CdSe QD increases the photon efficiency in the ternary detector, and at the same time the ternary detectors have high detectivity in broad spectral range. The responsivity of current to the light intensity exponent theta for detector B1, B2 and T is similar to 0.55, 0.55 and 0.62, respectively, which represents a complex process of electron hole generation, recombination and trapping within active material.

Item Type: Article
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 21 Oct 2016 05:14
Last Modified: 21 Oct 2016 05:14
URI: http://npl.csircentral.net/id/eprint/2011

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