Segregated Donor–Acceptor Columns in Liquid Crystals That Exhibit Highly Efficient Ambipolar Charge Transport

Abstract

Liquid crystalline donor (i.e., phthalocyanine) was covalently linked to acceptor (i.e, fullerene) to achieve efficient charge-transport properties in a liquid crystalline phase. The columnar structure exhibited highly efficient ambipolar charge-transport character, demonstrating the potential utility of the strategy in organic electronics.

Discotic liquid crystals of transition metal complexes 52: Synthesis and homeotropic alignment of liquid crystalline phthalocyanine-fullerene dyad bridged by vanillin

“…The helical structure very resembles spiranthes flowers, so that we named this unique structure as "spiranthes-like supramolecular structure" [31,32]. On the other hand, in 2010-11 Imahori and Shimizu joint research group also reported the helical structure of C 60 moieties in a Pc-C 60 dyad [19,24,25].…”

“…As far as we know, the first liquid crystals based on phthalocyanine fullerene (Pc-C 60 ) dyad ( Fig. 1[A]) were reported by our group in 2006 [10][11][12][13][14][15][16][17][18][19][20][21][22] and then Geerts group in 2009 [14]. Among our liquid crystalline Pc-C 60 dyads, we found at the first time in 2006 that some of the Pc-C 60 dyads exhibit perfect homeotropic alignment between two glass plates ( Fig.…”

“…1[C]. To more establish the helical structure of C 60 moieties, we adopted a new monodomain method (like as single crystal method) [23,[30][31][32] together with the conventional polydomain method (like as powder crystal method) [15][16][17][18][20][21][22][23][24][25][26][27][28][29][30][31][32] for the SAXS measurements. From these two different methods, we could thoroughly establish this additional peak as a helical pitch in Z-axis direction, at the first time in 2011 [23,[30][31][32].…”

Discotic liquid crystals of transition metal complexes 48: Synthesis of novel phthalocyanine-fullerene dyads and effect of a methoxy group on their clearing points

“…They can greatly reduce their costs to manufacture the solar cells. Liquid crystalline D-A systems are braodly classified into three groups: smectic liquid crystals [1][2][3][4], liquid crystalline copolymers [5][6][7][8][9][10][11][12] and discotic columnar liquid crystals [13][14][15][16][17][18][19][20][21][22][23][24][25]. In 2004 Kim et al reported that an organic photovoltaic cell was fabricated by using liquid crystalline N,N'-diheptyl-3,4,9,10-perylenetetracarboxylicdiimide (PTCDI-C7) as the electron acceptor and zinc phthalocyanine (ZnPc) as the electron donor [1].…”

Discotic liquid crystal-nanoparticle hybrid systems

“…Compound 11 with a rigid spacer does not show liquid crystalline properties, whereas compound 12 with a flexible spacer self-organizes in a rectangular columnar mesophase. Hayashi et al 67 covalently linked a Pc donor with a fullerene acceptor. The columnar structure formed by compound 13 exhibits highly efficient charge transport properties.…”