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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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Pentacene disproportionation during sublimation for field-effect transistors.

Luke B Roberson¹, Janusz Kowalik, Laren M Tolbert

¹School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Journal of the American Chemical Society

|March 3, 2005

Summary

Purifying pentacene inhibits disproportionation reactions, preventing the formation of 6,13-dihydropentacene and peripentacene. This purification enhances pentacene

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Area of Science:

Organic electronics
Materials science
Chemical synthesis

Background:

Pentacene is a key organic semiconductor.
Impurities can affect pentacene's electronic properties.
Understanding degradation pathways is crucial for device performance.

Purpose of the Study:

Investigate pentacene disproportionation reactions.
Identify byproducts and catalysts.
Determine the impact of impurities on pentacene mobility.

Main Methods:

Heating pentacene in flowing gas at 320°C.
Analysis of reaction products using spectroscopy and chromatography.
Measurement of field-effect mobility (FEM) before and after purification.

Main Results:

Pentacene disproportionates into 6,13-dihydropentacene (DHP) and peripentacene (PP) at 320°C.
Impurities (DHP, PQ, Al, Fe) catalyze the reaction and decrease FEM.
Purification removes impurities, inhibiting product formation and increasing FEM to 2.2 cm²/Vs.

Conclusions:

Material purification is critical for accurate intrinsic mobility measurements.
Optimizing purification enhances pentacene device performance.
Disproportionation is a key degradation pathway for pentacene.