Implication of molecular orientation on charge transport and gas sensing characteristics of cobalt–phthalocyanine thin films |
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Authors: | Ajay Singh S Samanta Arvind Kumar AK Debnath R Prasad P Veerender Vishal Balouria DK Aswal SK Gupta |
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Affiliation: | 1. Technical Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India;2. Department of Physics, Guru Nanak Dev University, Amritsar 143005, India |
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Abstract: | Charge transport and gas sensing characteristics of cobalt phthalocyanine films deposited along (ATB) and perpendicular (PTB) to the natural twin boundaries of (0 0 1) LaAlO3 substrate have been investigated. The charge carrier mobility of ATB films (∼5 cm2 V−1 s−1) is five orders of magnitude higher compared to that of PTB films (∼7 × 10−5 cm2 V−1 s−1), suggesting that twin boundaries acts like a template for ordering of molecules. The ATB films on exposure to ammonia showed a reversible increase of resistance, with fast response and recovery. In contrast PTB films showed same sensitivity, but exhibits base resistance drift along with sluggish response. |
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Keywords: | Organic semiconductors Thin films Space charge limited conduction Gas sensors |
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