Short communication Electrical properties of PET-MWCNT/MEH-PPV/Al organic device Walid Aloui n , Adnen Ltaief, Abdelaziz Bouazizi Laboratory of Physics of Condensed Matter and Nanosciences, Faculty of Sciences of Monastir, Avenue of the Environment, 5019 Monastir, Tunisia article info Keywords: Multi walled carbon nanotube MEH-PPV conjugated polymer Flexible organic diode abstract The study of electrical properties of flexible organic diode (OLEDs) based on MEH-PPV conjugated polymer, which utilize transparent and conducting multi walled carbon nanotube (MWCNT) thin films as anode on plastic substrate, is reported. Diode para- meters, such as the series resistance R s and the ideality factor n were calculated. Overall, our obtained results demonstrate the possibility of integrating the elaborated flexible electrodes in organic diodes having the structure PET-MWCNT/MEH-PPV/Al. & 2014 Elsevier Ltd. All rights reserved. 1. Introduction It is well known that the charge injection, from both electrodes, is an important parameter to determinate the performance of OLEDs [1]. We come to know it by the high conductivity and appropriate transparency. Indium tin oxide (ITO) has typically been used as the anode of choice for organic devices. Actually, indium is too limited in supply for extensive use in applications of solar energy and also high quality ITO is too expensive, moreover it is not a processed solution and may not acquire the flex- ibility needed for some applications. A further alternative is offered by carbon nanotube (CNT) that contains multi walled (MWCNT) and single walled (SWCNT) nanotube. This is due to their exceptional properties, which shows excellent chemical stability, high electrical conductivity and tunable work function (4.5–5.1 eV) [2]. CNT has recently emerged as polyvalent material for applications in organic electronics same as OLEDs and organic photo- voltaic cell (OPVs) [2–5]. A large effort has been devoted to the application of SWCNT to optoelectronics for their high conductivity [2,3,6–8]. On the other hand MWCNT has received less attention. In fact, they are easier to process than SWCNT, MWCNT are also less liable to form tight clusters and are comparatively cheaper. Also, due to the high number of concentric cylindrical graphitic tubes, MWCNT are perhaps even more suitable for the imple- mentation of charge transport and charge transfer, because of the metallic conductivity and the predictable HOMO– LUMO energy levels [9]. Generally, MWCNT are employed as a composite with conjugated polymers or as plain sheets in OLEDs which are employed as hole-injecting electrodes or charge transport layers [10–17]. This project firstly reports a flexible OLED with MWCNT on PET sub- strates as anode, then presents the demonstration of their use as transparent electrodes for organic diodes, and finally a systematic study of electric properties of PET- MWCNT/MEH-PPV/Al OLEDs is reported. 2. Experimental details The devices were fabricated as follows: first, MWCNT thin films were transferred onto polyethylene terephtha- late (PET) substrates. It is well described in our previous Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/mssp Materials Science in Semiconductor Processing http://dx.doi.org/10.1016/j.mssp.2014.06.044 1369-8001/& 2014 Elsevier Ltd. All rights reserved. n Corresponding author. Tel.: þ216 55956352. E-mail address: alouiwalid26@yahoo.fr (W. Aloui). Materials Science in Semiconductor Processing 27 (2014) 170–172