Switching charge-transfer characteristics from p-type to n-type through molecular "doping" (co-crystallization).

ABSTRACT: Borrowing an idea from the silicon industry, where the charge-carrier's characteristics can be changed through heteroatom implantation, we believe that the charge transport nature of organic semiconductors can be switched through molecular "doping" (co-crystallization). Here, we report a novel molecule 2,7-di-tert-butyl-10,14-di(thiophen-2-yl)phenanthro[4,5-abc][1,2,5]thiadiazolo[3,4-i]phenazine (DTPTP), which originally is a p-type (0.3 cm2 V-1 s-1) compound, and can be switched to an n-type semiconductor (DTPTP2-TCNQ, 3 × 10-3 cm2 V-1 s-1 under air conditions) through tetracyanoquinodimethane (TCNQ) doping (co-crystallization). Single crystal X-ray studies revealed that TCNQ-doped DTPTP complexes (DTPTP2-TCNQ) adopt a dense one-dimensional (1D) mixed ?-? stacking mode with a ratio of DTPTP and TCNQ of 2?:?1, while pure DTPTP molecules utilize a herringbone-packing pattern. Interestingly, theoretical analysis suggested that there is a quasi-2D electron transport network in this host-guest system. Our research results might provide a new strategy, to switch the charge transport characteristics of an original system by appropriate molecular "doping" (co-crystal engineering).

SUBMITTER: Zhang J 

PROVIDER: S-EPMC6013807 | biostudies-other | 2016 Jun

REPOSITORIES: biostudies-other