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Switching charge-Transfer characteristics from p-Type to n-Type through molecular "doping" (co-crystallization)
J. Zhang, P. Gu, G. Long, , Y. Li, N. Aratani, H. Yamada, Q. Zhang
Published in Royal Society of Chemistry
Volume: 7
Issue: 6
Pages: 3851 - 3856
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 π-π 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). © The Royal Society of Chemistry.
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