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A Cd(II)-based MOF as a photosensitive Schottky diode: experimental and theoretical studies

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Abstract

A Cd(II) based 2D metal–organic framework (MOF), [Cd(4-bpd)(SCN)2]n (1) where 4-bpd = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene, has been synthesized and characterized by standard methods including single crystal X-ray diffraction analysis. When it is sandwiched between ITO coated glass and Al, 1 shows interesting conduction properties. The IV characteristics of the ITO/1/Al configuration measured in the dark and under illumination of incident light exhibit a highly non-linear rectifying behavior, which signifies its Schottky diode character. The conductivity of the configuration is 2.90 × 10−4 S m−1 and 7.16 × 10−4 S m−1 under dark and photoirradiation conditions, respectively. Different parameters have been analyzed and these indicate that 1 can be a promising candidate for light sensing electronic devices. This material has good sensitivity to the light source when switched on/off. Theoretical calculations have been performed to understand the reason for the enhancement of conductivity under illumination of incident light. It has been found that upon irradiation, slight changes in the bond distances of 4-bpd in 1 occur. These changes are related to the considerable decrease in the energy needed for the allowed electronic transition. This may influence the increase of conductivity along with other factors.

Graphical abstract: A Cd(ii)-based MOF as a photosensitive Schottky diode: experimental and theoretical studies

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Publication details

The article was received on 16 Jun 2017, accepted on 25 Jul 2017 and first published on 25 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT02184D
Citation: Dalton Trans., 2017, Advance Article
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    A Cd(II)-based MOF as a photosensitive Schottky diode: experimental and theoretical studies

    S. Halder, A. Dey, A. Bhattacharjee, J. Ortega-Castro, A. Frontera, P. P. Ray and P. Roy, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02184D

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