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Self‐Assembly of Solution‐Processable Polyindole via Langmuir‐Blodgett Technique: An Insight to Layer‐Dependent Charge Transport and Electronic Parameters
Author(s) -
Mishra Richa,
Pandey Rajiv K.,
Upadhyay Chandan,
Prakash Rajiv
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700794
Subject(s) - fabrication , raman spectroscopy , materials science , langmuir–blodgett film , absorption spectroscopy , optoelectronics , scanning electron microscope , absorption (acoustics) , analytical chemistry (journal) , nanotechnology , chemistry , optics , composite material , medicine , physics , alternative medicine , pathology , chromatography , monolayer
Ordering of polymer chains at molecular level using a suitable post‐synthesis fabrication technique is highly motivating towards enhancement in performance of organic electronic devices. Here, we report the formation of stable, large area self‐assembled Langmuir‐Blodgett (LB) films of unsubstituted polyindole (PIn) without aid of any surfactant. Pressure vs Area (π‐A) isotherm for PIn is studied prior to device fabrication. Investigation of film uniformity via atomic force microscopy and scanning electron microscopy justified 30 mN/m as optimum surface pressure for depositing large area PIn LB films. Self‐assembly in LB film is confirmed by absorption and Raman spectroscopy before device fabrication. A layer dependent charge transport of LB film of PIn is studied via current density (J)–voltage (V) characteristics and subsequently various device parameters are extracted using Schottky diode configuration of sandwiched structure Al/PIn LB film/ITO. A deviation in ideality factor, rectification ratio, current density and barrier height is observed for different number of layers. The electrical characteristics are also discussed taking into account the absorption spectra, Raman spectra, surface morphology, topography, barrier height. This study shows enormous potential for the fabrication of ordered PIn polymer on large area based electronic device application.