Physical vapour deposition of cyanine salts and their first application in organic electronic devices

Abstract

A volatile high molecular weight organic salt semiconductor is presented, allowing the introduction of physical vapour deposition techniques in cyanine dye salt semiconductors.

Development of benzo[cd]indolenyl cyanine dyes for NIR-absorbing films and elucidation of molecular structure–spectroscopic relationship

“…In addition, the interaction between the cyanine cation and counter anion pair is a form of electrostatic Coulomb interaction that highly depends on the magnitude of the charges and the distance between the cations and anions. 53,61 Since small anions possess concentrated negative charges and are closely positioned to cyanine chromophores, an increase in electrostatic interactions between cyanine cations and counter anions is expected. Thus, under high-temperature conditions, the small counter anions themselves can act as nucleophiles, allowing them to attack cyanine molecules and trigger thermal decomposition pathways.…”

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes†

“…[ 77 ] Due to the ionic character, Cys commonly exhibit low miscibility with acceptor molecules, accompanied with significant phase separation in BHJ blend films. [ 78‐79 ] Therefore, most Cy‐based OPDs adopt the single or PHJ layer structure for fabricating OPDs, because high‐quality thin films with a smooth surface and low density of pinholes are required to suppress the dark current, which however is very difficult to achieve due to the interference effects from various external conditions. [ 80 ] More critically, a low EQE would be the main limiting factor of performance, due to a short exciton diffusion length of Cys, which is detrimental to the exciton's diffusion to the D‐A interface.…”

Structure–Properties Correlations in the Range of Cationic Spiropyrans as Analogues of Cyanine Dyes

“…[9] Though, this type of structural modification is extremely important in some cases. [10][11][12] Due to structural similarity, the merocyanine (Mc) forms of spiropyrans (SPPs) can also be considered as analogues of trimethine Cys in most cases (Figure 1). However, the structure of Mc form of SPP salts with conjugated vinyl-3H-indolium fragment is similar to HMCys, [13] especially to IR-786 widely used in bioimaging.…”

“…Wherein, only slight changes in absorption properties have been observed during anion variations in polar solvents [9] . Though, this type of structural modification is extremely important in some cases [10–12] …”