(Invited) Polymer Nanopatterned Layers for Organic Solar Cell Applications
In an organic bulk heterojunction solar cell is very important to improve the exciton dissociation, charge transport and to reduce the recombination. Polymer nanopatterned structures allow that the excitons can reach until the donor/acceptor interface to be dissociated into electrons and holes and the free charge carriers can travel along the uninterrupted pathway until they reach their respective electrodes. Interdigitated polymer nanostructures allow the domains in the p-type donor material (polymer) and the n-type acceptor material (fullerene) to be aligned normal to the electrode surfaces, thus increasing their crystallinity and charge carrier mobility and reducing recombination rates inside the device .
In this scenario, herein, we present the manufacture of the NAAT and interdigitated morphology to obtain the nanopatterned organic solar cell. Figure 1a and 1b show the environment scanning electron microscopy (ESEM) images of NAAT and P3HT-nanopatterned structure. Fig. 1c shows the nanopatterned device with the stack ITO / PEDOT:PSS / poly (3-hexylthiophene) P3HT-nanopatterned / [6,6]-phenyl-C71-butyric acid methyl (PC70BM) / Ca / Ag. Furthermore, we characterized and analysed the current-voltage characteristic of this solar cell measured under light and dark conditions. Finally, we discuss the future and potential applications of the NAAT to be used in nanopatterned layers manufactured with other semiconductor materials.
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