Photoconductive Behavior of the PPV/RGO Composites: Insights of Charge Transfer Process

Abstract

The paper deals with a study of composites based on poly(p-phenylenevinylene) (PPV) and reduced graphene oxide (RGO) in terms of photoconductivity and photocurrent (PC) dynamics in charge-discharge cyclic processes. The explanation for the photoconductive behavior is built with the support of DeVore and Onsager theories. Scanning samples in both directions involves charge transport, to and from, available energy states called defect centers. The existence of these centers is confirmed by a decrease in the composite bandgap caused by the RGO localized states which are situated slightly above the first HOMO level in the PPV bandgap. The contribution of RGO to the photoconductive properties of PPV is revealed through a photocurrent value with two orders of magnitude higher than for PPV.

Combinatorial non-covalent assembly of graphene oxide and chromophores into hybrid nanofilms for organic electronics

“…This transfer can manifest itself as a quenching of fluorescence, 23,24 high charge mobility 25 and the emergence of photoconductivity. 26 Depending on the electronic structure of the organic component, the GO layer with its low Fermi level can act as a donor 27 or acceptor 28 of electrons. This combination of properties makes GO especially promising for fabricating composite GO/organic coatings as photosensitive layers transporting electrons or holes in optically transparent thin-film solar cells.…”

Ambipolar to Unipolar Conversion in C70/Ferrocene Nanosheet Field-Effect Transistors

“…Recently, significant attention has been paid to developing technologically significant applications for CT complexes, such as thermoelectric devices [22,23], photoconductors [24], sensors [25], ferroelectrics [26], and organic field-effect transistors (OFETs) [27][28][29], in which CT complexes can function as either organic metals or organic semiconductors. Ambipolar transport, wherein positive and negative charge carriers can both be transported concurrently within the same semiconducting channel, can broaden the scope of semiconductor applications.…”

One-Step Interfacial Integration of Graphene Oxide and Organic Chromophores into Multicomponent Nanohybrids with Photoelectric Properties

“…The electron-rich carbon carcass can stabilize the separated charges 35,36 leading to synergetic effects, such as the emergence of photoconductivity 37,38 or quenching of fluorescence. 39−41 The most widely applied methods for fabricating the GObased hybrid films on solids are the deposition of GO nanoparticles with the preadsorbed organic molecules from solutions 38,42 and the layering of organic components via layer-by-layer (L-b-L) assembly on the GO sheets already immobilized on a solid substrate. 43−45 The L-b-L method, although time consuming, makes it possible to integrate a comparatively large number of different components into the same hybrid structure.…”