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Isomeric iminofullerenes as acceptors in bulk heterojunction organic solar cells
Park, Sung Heum,Yang, Changduk,Cowan, Sarah,Lee, Jae Kwan,Wudl, Fred,Lee, Kwanghee,Heeger, Alan J. Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.31
<P>Two stable iminofullerene isomers, [5,6]-open azafulleroid (open APCBM) and [6,6]-closed aziridinofullerene (closed APCBM) enable us to scrutinize the use of these new acceptors in polymer bulk heterojunction (BHJ) solar cells and compare the effects of open trans- and closed trans-annlar subunits. When we compared the performance of both isomer devices, the poly(3-hexylthiophene)(P3HT):open APCBM device demonstrates an enhancement in photocurrent in comparison with the P3HT:closed APCBM device. From the comparative study, we attribute the enhanced current to the lower degree of symmetry of open APCBM. The alteration of fullerene structure from closed to open breaks its high degree of symmetry and consequently leads to an improved bulk heterojunction with the electron donating conjugated polymer.</P> <P>Graphic Abstract</P><P>The comparative study of bulk heterojunction solar cells based on two isomeric iminofullerenes, [5,6]-open azafulleroid and [6,6]-closed aziridino-fullerene as electron acceptors in combination with P3HT material are carried out. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b904535j'> </P>
Kim, Jonggi,Yun, Myoung Hee,Lee, Junghoon,Kim, Jin Young,Wudl, Fred,Yang, Changduk Royal Society of Chemistry 2011 Chemical communications Vol.47 No.11
<P>Through the esterification of an acyl chloride functionalized fullerene precursor with dendritic alcohol, a fullerene-rich dendron containing a norbornene unit at the focal point is prepared for ring-opening metathesis polymerization to obtain its linear polymer with a unimodal and narrow molar mass distribution (PDI = 1.08) by a progressive addition of catalysts.</P> <P>Graphic Abstract</P><P>A platform for a fullerene-rich linear polymer is established through ROMP and a controlled methodology of addition of catalyst. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc05470d'> </P>
Amorphous dithenylcyclopentadienone-carbazole copolymer for organic thin-film transistors
Kang, Evan S. H.,Yuen, Jonathan D.,Walker, Wesley,Coates, Nelson E.,Cho, Shinuk,Kim, Eunseong,Wudl, Fred Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.14
<P>We developed a new high performance amorphous donor–acceptor conjugated copolymer consisting of a dithienylcylclopentadienone subunit as an electron acceptor and carbazole derivative as an electron donor. X-Ray diffraction analysis shows no scattering patterns, indicating that a disordered amorphous solid is formed. Atomic force microscopy (AFM) images show an amorphous surface mophology regardless of the annealing temperature. A high on/off current ratio of approximately 10<SUP>6</SUP> and high field effect mobility of 2.2 × 10<SUP>−2</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> were obtained with stable output characteristics. The high performance of the amorphous copolymer is ascribed to the relatively low activation energy and low characteristic temperature obtained from a low temperature transport analysis, reflecting that localization of the charge carrier is not substantial in the film.</P> <P>Graphic Abstract</P><P>A new high performance amorphous copolymer (DTCPD-<I>alt</I>-CB) was developed. The high carrier mobility is ascribed to low activation energy and characteristic temperature, indicating that charge carrier localization is not substantial. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b926066h'> </P>