Charge injected proton transfer in indigo derivatives

Abstract

In analogy with excited-state proton transfer, proton transfer is significantly facilitated in cationic and anionic molecules of indigo derivatives generated in the field-effect transistors. We have prepared extended and truncated...

Small-molecule ambipolar transistors

“…71 Ambipolar transport is observed as well when a phenyl ring is inserted in the central CC part ( IG-11 and IG-12 ). 96…”

“…95 The same mechanism makes indigo derivatives significantly better donors and acceptors than expected from the isolated molecules. 96 In addition, the proton transfer considerably enhances the interchain transfer integrals. The ambipolar transport of IG-1 is also realized by using other aliphatic passivation layers such as tetracontane (C 40 H 82 , TC) and paraffin wax (mixture of C 15 -C 40 normal hydrocarbons, PF).…”

“…71 Ambipolar transport is observed as well when a phenyl ring is inserted in the central CQC part (IG-11 and IG-12). 96 Thioindigo (TIG, Fig. 3), which is a structural analogue of indigo containing sulfur atoms in place of the NH groups, has been found to show ambipolar transport, but the mobility is one to two orders of magnitude lower than that of indigo.…”

Charge Polarity Control in Organic Transistors of Mixed and Segregated Complexes Based on Diaminonaphthalene and Pyrene

“…The transfer integrals in the donor and acceptor stacks are similar (188 and 213 meV in Table S4 ); hence, balanced ambipolar characteristics are reasonable. In analogy with indigo derivatives, 54 the interstack transfer integrals are as large as one-third (∼60 meV) of the intrastack transfer integrals due to the hydrogen bonds ( Table S4 ). This is reminiscent of the reported small anisotropy of the single-crystal conductivity and the small difference between the powder and single-crystal conductivity.…”

Investigation of the transient photo-response and switching window of an Al/indigo/Al device: unveiling negative photoconductivity and the photo-enhanced memory window

“…8,9 Photo-conductivity has been observed in many materials, importantly in materials such as ZnO, GaN, GaN nanowires, 2H-MoSe 2 , MoS 2 , p-type Si nanomembranes, n-type GaN thin films, graphene, inorganic perovskites, etc. [10][11][12][13][14][15][16][17][18][19] While most of the literature studies discuss the positive photoconductivity, where the photocurrent increases as soon as the materials are exposed to given radiation, there are reports on materials that show switching between PPC and NPC depending on the excitation wavelength, 20 adsorption of oxygen 17,21,22 and temperature. 23 Recently, ambipolar photoresponse has also been detected in ZnO:CsPbX 3 heterostructures with good control over the transition between the PPC and NPC.…”