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Article Dans Une Revue Journal of Materials Chemistry C Année : 2023

Shear-aligned large-area organic semiconductor crystals through extended π- π interaction

Songyi Zhang
  • Fonction : Auteur
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Vinayak Bhat
Yilei Wu
Yusheng Lei
Yoko Tomo
Huaxin Gong
Lukas Michalek
Donglai Zhong
Can Wu
Chad Risko
Michel Frigoli
Zhenan Bao
  • Fonction : Auteur

Résumé

Small molecule-based organic semiconductors are of broadly interest in organic field-effect transistors (OFETs) due to their potential for high crystallinity and electrical performance. The 2D molecule, TIPS-peri-pentacenopentacene (TIPS-PPP), which is the vertical extension of the 1D TIPS-pentacene (TIPS-PEN) molecule, offers a lower bandgap, higher aromaticity, and an enhanced π-π interaction with neighboring molecules in the solid state when compared to TIPS-PEN. However, an in-depth understanding of the relationship between the molecule structure, solid-state molecular packing, and the electronic properties has not been reported due to poor control over the TIPS-PPP crystallite size. In this work, we successfully engineered highly oriented large-area TIPS-PPP crystals through the solution shear coating technique. Compared with narrow ribbon-like TIPS-PEN crystals, TIPS-PPP crystals can grow centimeters long and over 500 µm wide. TIPS-PPP molecules are less susceptible to forming metastable polymorphs than TIPS-PEN molecules upon fast evaporation. The crystal structure of TIPS-PPP is also thermally stable at 250 °C. Notably, the anisotropic charge carrier mobility of TIPS-PPP crystals is resolved through fabricating bottom-gate top-contact devices, with a hole mobility of 3.1 cm2V-1s-1 along the preferred packing direction. Further device optimization using top-gate bottom-contact devices improved the mobility up to 6.5 cm2V-1s-1, which is among the highest for pentacene-derivative-based organic semiconductors

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Dates et versions

hal-04126187 , version 1 (10-10-2023)

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Songyi Zhang, Felix Talnack, Tanguy Jousselin-Oba, Vinayak Bhat, Yilei Wu, et al.. Shear-aligned large-area organic semiconductor crystals through extended π- π interaction. Journal of Materials Chemistry C, 2023, 11 (26), pp.7717-7723. ⟨10.1039/D3TC01311A⟩. ⟨hal-04126187⟩
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