AI Article Synopsis
- The study investigates the stability of binary organic semiconductor glasses created through physical vapor deposition (PVD), specifically using a 50:50 mixture of TPD and m-MTDATA.
- Results show that these binary glasses exhibit remarkable thermodynamic and kinetic stability when deposited at specific substrate temperatures (0.78-0.90 times the glass transition temperature).
- The findings suggest that the mechanisms governing stability in single-component glasses also apply to codeposited mixtures, which could help in the development of improved organic electronic devices.
Article Abstract
While previous work has identified the conditions for preparing ultrastable single-component organic glasses by physical vapor deposition (PVD), little is known about the stability of codeposited mixtures. Here, we prepared binary PVD glasses of organic semiconductors, TPD (,'-Bis(3-methylphenyl)-,'-diphenylbenzidine) and m-MTDATA (4,4',4″-Tris[phenyl(m-tolyl)amino]triphenylamine), with a 50:50 mass concentration over a wide range of substrate temperatures (). The enthalpy and kinetic stability are evaluated with differential scanning calorimetry and spectroscopic ellipsometry. Binary organic semiconductor glasses with exceptional thermodynamic and kinetic stability comparable to the most stable single-component organic glasses are obtained when deposited at = 0.78-0.90 (where is the conventional glass transition temperature). When deposited at 0.94, the enthalpy of the m-MTDATA/TPD glass equals that expected for the equilibrium liquid at that temperature. Thus, the surface equilibration mechanism previously advanced for single-component PVD glasses is also applicable for these codeposited glasses. These results provide an avenue for designing high-performance organic electronic devices.
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| http://dx.doi.org/10.1021/acs.jpclett.3c00728 | DOI Listing |
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