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Two-Step Solution-Processed Two-Component Bilayer Phthalocyaninato Copper-Based Heterojunctions with Interesting Ambipolar Organic Transiting and Ethanol-Sensing Properties

Abstract : The two-component phthalocyaninato copper-based heterojunctions fabricated from n-type CuPc(COOC8H17)(8) and p-type CuPc(OC8H17)(8) by a facile two-step solution-processing quasi-Langmuir-Shafer method with both n/p- and p/n-bilayer structures are revealed to exhibit typical ambipolar air-stable organic thin-film transistor (OTFT) performance. The p/n-bilayer devices constructed by depositing CuPc(COOC8H17)(8) film on CuPc(OC8H17)(8) sub-layer show superior OTFT performance with hole and electron mobility of 0.11 and 0.02 cm(2) V-1 s(-1), respectively, over the ones with n/p-bilayer heterojunction structure with the hole and electron mobility of 0.03 and 0.016 cm(2) V-1 s(-1) due mainly to the more intense face-to-face - interaction in the CuPc(OC8H17)(8) sub-layer than that in CuPc(COOC8H17)(8) sub-layer, revealing the effect of different stacking sequence on tuning the OTFT performance of phthalocyanine-based bilayer heterojunctions. Furthermore, the chemiresistive devices fabricated from the p/n-bilayer heterojunction, with both Au and Indium tin oxide (ITO) interdigitated electrodes (IDEs), also display much better sensing properties to ethanol than those with n/p-bilayer heterojunction in terms of sensitivity and reversibility. Significantly, time-dependent current plot of the p/n-bilayer heterojunction with ITO IDEs reveals a detection limit as low as 100 ppm, nearly complete reversibility, and high selectivity to ethanol even at room temperature, rendering this novel two-component heterojunction device a great application potential in practical detecting ethanol.
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01402409
Contributeur : Icmub - Université de Bourgogne <>
Soumis le : jeudi 24 novembre 2016 - 16:09:12
Dernière modification le : vendredi 8 juin 2018 - 14:50:12

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Yanli Wu, Pan Ma, Ningan Wu, Xia Kong, Marcel Bouvet, et al.. Two-Step Solution-Processed Two-Component Bilayer Phthalocyaninato Copper-Based Heterojunctions with Interesting Ambipolar Organic Transiting and Ethanol-Sensing Properties. Advanced Materials Interfaces, Wiley, 2016, 3 (16), ⟨10.1002/admi.201600253⟩. ⟨hal-01402409⟩

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