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Jo, Sae Byeok,Kim, Hyun Ho,Lee, Hansol,Kang, Boseok,Lee, Seongkyu,Sim, Myungsun,Kim, Min,Lee, Wi Hyoung,Cho, Kilwon American Chemical Society 2015 ACS NANO Vol.9 No.8
<P>Photon harvesting in organic solar cells is highly dependent on the anisotropic nature of the optoelectronic properties of photoactive materials. Here, we demonstrate an efficient approach to dramatically enhance photon harvesting in planar heterojunction solar cells by using a graphene–organic heterointerface. A large area, residue-free monolayer graphene is inserted at anode interface to serve as an atomically thin epitaxial template for growing highly orientated pentacene crystals with lying-down orientation. This anisotropic orientation enhances the overall optoelectronic properties, including light absorption, charge carrier lifetime, interfacial energetics, and especially the exciton diffusion length. Spectroscopic and crystallographic analysis reveal that the lying-down orientation persists until a thickness of 110 nm, which, along with increased exciton diffusion length up to nearly 100 nm, allows the device optimum thickness to be doubled to yield significantly enhanced light absorption within the photoactive layers. The resultant photovoltaic performance shows simultaneous increment in <I>V</I><SUB>oc</SUB>, <I>J</I><SUB>sc</SUB>, and FF, and consequently a 5 times increment in the maximum power conversion efficiency than the equivalent devices without a graphene layer. The present findings indicate that controlling organic–graphene heterointerface could provide a design strategy of organic solar cell architecture for boosting photon harvesting.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-8/acsnano.5b03929/production/images/medium/nn-2015-03929n_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03929'>ACS Electronic Supporting Info</A></P>
Polymer blends with semiconducting nanowires for organic electronics
Jo, Sae Byeok,Lee, Wi Hyoung,Qiu, Longzhen,Cho, Kilwon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.10
<P>This article reviews the recent advances in organic electronics based on polymer blends with one-dimensional (1D) nanowires (NWs) of π-conjugated polymers. Self-assembled polymer semiconducting NWs are fascinating building blocks for their directional extension of inter- and intramolecular π-conjugation. This extensive conjugation provides unique electrical and optical properties that benefit applications in organic electronic devices. Outstanding performances are particularly expected from blending these NWs with insulating polymers or semiconducting molecules. Several representative reports describing NWs prepared from semiconducting/insulating polymer blends, conjugated block copolymers, or electrospinning for use as high-performance organic thin-film transistors (OTFTs) are discussed. The concepts of phase-separation behavior and the growth of crystalline NWs from multi-phase blend solutions are also illustrated. Research into the solubility-induced formation of NWs from semiconducting polymer/n-type small molecule blends for high-efficiency organic photovoltaic solar cells (OPVs) is introduced. In addition, the effects of the chemical properties of conjugated polymers on the optical and electrical properties of NWs and the use of ordered NW structures in OPVs are summarized. This critical review provides insights and a new perspective on the optimization of blend morphologies, which consequently enhances the performance of organic electronic devices.</P> <P>Graphic Abstract</P><P>Recent advances and fundamentals in organic electronic devices based on polymer blends with one-dimensional nanowires of π-conjugated polymers are reviewed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm16059e'> </P>