A growth mode of pentacene thin films deposited by high vacuum sublimation where the morphology versus thickness h "rings" back and forth between rough 3D films with pyramid islands and smooth 2D films with ziqqurat islands is discovered. The roughness & sigma; versus h exhibits seamless coherent oscillations whose amplitude and wavelength increase as integer multiples of 1.5 ML thickness. The quantized oscillations are reconducted to dynamic wetting/dewetting transitions involving the upper layers of pentacene film. Importantly, the transconductance of organic field effect transistors, either in solid state or electrolyte-gated, exhibits antiphase oscillations with one-decade swing. Charge mobilities in the wetting regime reach 0.1 cm(2) V-1 s(-1), in line with high-end values reported for thin-film pentacene transistors. Controlling this growth mode enables the limitations of charge transport imposed by the roughening transition to be overcome, a universal feature of high vacuum growth to date.

Nanoscale Quantized Oscillations in Thin-Film Growth Greatly Enhance Transconductance in Organic Transistors / Drakopoulou, S; Murgia, M; Albonetti, C; Benaglia, S; Borgatti, F; Di Lauro, M; Bianchi, M; Greco, P; Papo, D; Garcia, R; Alessandrini, A; Biscarini, F. - In: ADVANCED ELECTRONIC MATERIALS. - ISSN 2199-160X. - 9:10(2023), pp. 2300320-2300320. [10.1002/aelm.202300320]

Nanoscale Quantized Oscillations in Thin-Film Growth Greatly Enhance Transconductance in Organic Transistors

Drakopoulou, S;Murgia, M;Benaglia, S;Borgatti, F;Di Lauro, M;Bianchi, M;Biscarini, F
2023

Abstract

A growth mode of pentacene thin films deposited by high vacuum sublimation where the morphology versus thickness h "rings" back and forth between rough 3D films with pyramid islands and smooth 2D films with ziqqurat islands is discovered. The roughness & sigma; versus h exhibits seamless coherent oscillations whose amplitude and wavelength increase as integer multiples of 1.5 ML thickness. The quantized oscillations are reconducted to dynamic wetting/dewetting transitions involving the upper layers of pentacene film. Importantly, the transconductance of organic field effect transistors, either in solid state or electrolyte-gated, exhibits antiphase oscillations with one-decade swing. Charge mobilities in the wetting regime reach 0.1 cm(2) V-1 s(-1), in line with high-end values reported for thin-film pentacene transistors. Controlling this growth mode enables the limitations of charge transport imposed by the roughening transition to be overcome, a universal feature of high vacuum growth to date.
2023
9
10
2300320
2300320
Nanoscale Quantized Oscillations in Thin-Film Growth Greatly Enhance Transconductance in Organic Transistors / Drakopoulou, S; Murgia, M; Albonetti, C; Benaglia, S; Borgatti, F; Di Lauro, M; Bianchi, M; Greco, P; Papo, D; Garcia, R; Alessandrini, A; Biscarini, F. - In: ADVANCED ELECTRONIC MATERIALS. - ISSN 2199-160X. - 9:10(2023), pp. 2300320-2300320. [10.1002/aelm.202300320]
Drakopoulou, S; Murgia, M; Albonetti, C; Benaglia, S; Borgatti, F; Di Lauro, M; Bianchi, M; Greco, P; Papo, D; Garcia, R; Alessandrini, A; Biscarini, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1330826
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