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Abstract
The present work aims to prepare and characterize very thin films of poly(fullerene)s in order to investigate their electrical properties and the influence of xylene and chloroform solvents on these materials. The fullerenes studied were phenyl-C61-butyric acid methyl ester (PCBM), oligo{(phenyl-C61-butyric acid methyl ester)-alt-[1,4-bis(bromomethyl)-2,5-bis(octyloxy)benzene]} (OPCBMMB) and poly{[bispyrrolidino(phenyl-C61-butyric acid methyl ester)]-alt-[2,5-bis(octyloxy) benzene]} (PPCBMB), along with poly(3-hexylthiophene) (P3HT). The Langmuir-Schaeffer technique was used to prepare films, which were deposited on interdigitated gold substrates, and electrically characterized, with emphasis on the study of transport, conductivity and mobility mechanisms with respect to the solvents used. We found that the addition of P3HT significantly increased the conductivity of these materials. The xylene cast PPCBM, in both pure and mixed forms under dark conditions, presented the best conductivity results with respect to the other materials. However, when chloroform was used, it was found that OPCBMMB in both pure and mixed forms under light, exhibited the best conductivities. This is the first treatment, to our knowledge, of the impact of solvents on the electronic properties of poly(fullerene)s.
Highlights
Organic solar cells have attracted significant attention due to their characteristics such as their lightweight, low-cost and flexibility[1]
The effect of the solvent on the active organic layer has received significant attention during the past few years[6]. This is because the solvent used to form and cast the active layer can play a compelling role in controlling the morphology of the phenyl-C61-butyric acid methyl ester (PCBM):P3HT structure, which in turn, strongly influences the separation and transport of charge carriers, and has a massive impact on the final performance of the solar cell[6]
Pure and mixed films were transferred onto the interdigitated electrodes (IDEs) substrates using the LS technique and electrical measurements were taken in two different situations: in the dark and under incidence of light
Summary
Organic solar cells have attracted significant attention due to their characteristics such as their lightweight, low-cost and flexibility[1]. The bulk heterojunction of PCBM:P3HT (acceptor:donor) as an active layer was one of the most investigated structures for organic photovoltaics[3]. The effect of the solvent on the active organic layer has received significant attention during the past few years[6]. This is because the solvent used to form and cast the active layer can play a compelling role in controlling the morphology of the PCBM:P3HT structure, which in turn, strongly influences the separation and transport of charge carriers, and has a massive impact on the final performance of the solar cell[6]
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