Light induced electro-luminescence patterning: interface energetics modification at semiconducting polymer and metal-oxide heterojunction in a photodiode
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Authors
Bobbara, Sanyasi
Salim, Ehab
Barille, Regis
Nunzi, JM
Date
2018-10-01
Type
journal article
Language
en
Keyword
Zinc-oxide , Solar Cell , Light Emitting Diode , Charge Transport , Photo-Patterning
Alternative Title
Abstract
Understanding the injection barriers and defect states at the metal−organic or inorganic−organic interfaces is one of the key challenges in improving the efficiency of hybrid electronic devices. In this paper, polymer and metal-oxide-based photodiodes are subjected to light soaks to probe the interface and bulk induced defects and energetics. Polymers poly(3-hexylthiophene-2,5-diyl) and poly[N-9′-heptadecanyl-2,7-carbazole-alt- 5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] were used as active medium in an “inverted” sandwich-type device configuration to study the effect of light soak on current− voltage, charge trapped and stored, electroluminescence, photovoltage, and photocurrent characteristics. The results collectively demonstrate a modification to the cathode contact and polymer interface energetics. Ultraviolet (UV)-assisted photodesorption of oxidizing agents at the interface of nanostructured zinc oxide derived from a sol−gel precursor and the polymer lowers the magnitude of cathode work function. As a result, we have realized an efficient light-emitting diode stencilled out of the diode after UV exposure. The work function and interface barrier modification followed by energy band bending within the device is proposed. Our results emphasize the role of unintentional injection barriers and a solution to the issue often encountered in the hybrid organic−inorganic electronic devices.
Description
Citation
J. Phys. Chem. C 41, 23506-23514 (2018)
Publisher
American Chemical Society
License
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in J. Phys. Chem. C, copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.8b07033