Organic MEMS/NEMS-based high-efficiency 3D ITO-less flexible photovoltaic cells

Sam Kassegne*, Kee Moon, Pablo Martín-Ramos, Mohammad Majzoub, Gunay Zturk, Krishna Desai, Mihir Parikh, Bao Nguyen, Ajit Khosla, Pedro Chamorro-Posada

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Scopus citations


    A novel approach based on three-dimensional (3D) architecture for polymeric photovoltaic cells made up of an array of sub-micron and nano-pillars which not only increase the area of the light absorbing surface, but also improve the carrier collection efficiency of bulk-heterojunction organic solar cells is presented. The approach also introduces coating of 3D anodes with a new solution-processable highly conductive transparent polymer (Orgacon™) that replaces expensive vacuum-deposited ITO (indium tin oxide) as well as the additional hole-collecting layer of conventional PEDOT:PSS (poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate)). In addition, the described procedure is well suited to roll-to-roll high-throughput manufacturing. The high aspect-ratio 3D pillars which form the basis for this new architecture are patterned through micro-electromechanical-system- and nano-electromechanical- system-based processes. For the particular case of P3HT (poly(3-hexylthiophene)) and PCBM (phenyl-C61-butyric acid methyl ester) active material, efficiencies in excess of 6% have been achieved for these photovoltaic cells of 3D architecture using ITO-less flexible PET (polyethylene terephthalate) substrates. This increase in efficiency turns out to be more than twice higher than those achieved for their 2D counterparts.

    Original languageEnglish (US)
    Article number115015
    JournalJournal of Micromechanics and Microengineering
    Issue number11
    StatePublished - Nov 2012

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering


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