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Exploring Ambipolar Semiconductor Nature of Binary and Ternary Charge-Transfer Cocrystals of Triphenylene, Pyrene, and TCNQ
journal contribution
posted on 2020-03-16, 21:29 authored by Arkalekha Mandal, Anwesha Choudhury, Sudip Sau, Parameswar Krishnan Iyer, Prasenjit MalApplications of organic
cocrystal systems to obtain semiconductor
materials with low band gap, balanced electron and hole carrier mobility,
low cost, solution processability, air stability, and easy preparative
route have been widely sought after in recent years. Herein, we describe
two organic donor–acceptor cocrystals (T2TC1)·toluene and T1P1TC2 comprising pyrene (P), triphenylene
(T) as the π-donors, and tetracyanoquinodimethane
(TCNQ) (TC) as the π-acceptor exhibiting significant
ambipolar semiconductor nature with charge carrier mobility values
in the range 0.01–0.03 cm2 V–1 s–1. Both the cocrystals possess mixed D–A
stack comprising triphenylene and TCNQ molecules, whereas the other
triphenylene or pyrene molecule is inserted between adjacent mixed
DA stacks. The cocrystals are characterized with appropriate band
gap (1.5–2.5 eV) and lower lying lowest unoccupied molecular
orbital level (−4.1 to −4.3 eV) for ambipolar charge
transport, low preparation cost, solution processability which make
them ideal organic semiconductor materials for practical application.
Theoretical studies show that high ambipolar semiconductor nature
is a result of synergism between two principal charge carrier transfer
pathways in cocrystal system viz. superexchange and direct paths owing
to the unique supramolecular features of cocrystals (T2TC1)·toluene and T1P1TC2.
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charge carrier transfer pathwaysTheoretical studies showcocrystal system vizTCNQT 2TCsolution processabilityhole carrier mobilityTernary Charge-Transfer CocrystalsT 1PDAambipolar charge transportcharge carrier mobility valuessemiconductor materialsExploring Ambipolar Semiconductor Naturetriphenyleneambipolar semiconductor nature
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