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We synthesized two new indolo[3,2-b]carbazole (ICZ) derivatives, CICZ and CHICZ.The effect of chemical substitutions on molecular packing and electronic properties of organic semiconductors were examined.The introduction of alkyl chains at N-5 and N-11 positions not only enhanced the solubility and se1f-organization of the compounds but also shifted the molecular packing from herringbone to one-dimensional-stacking.