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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

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Tuning polymorphism and orientation in organic semiconductor thin films via post-deposition processing.

Anna M Hiszpanski¹, Robin M Baur, Bumjung Kim

¹Department of Chemical and Biological Engineering, Princeton University , A323 Engineering Quadrangle, Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society

|October 16, 2014

Summary

Researchers precisely controlled organic semiconductor crystal structure and molecular orientation. Both factors significantly impact thin-film transistor performance, each affecting mobility by an order of magnitude.

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Area of Science:

Materials Science
Organic Electronics
Solid-State Physics

Background:

Charge transport in organic semiconductors is influenced by crystal structure and molecular orientation.
Controlling these properties independently in thin films is difficult, often requiring precise deposition conditions.

Purpose of the Study:

To demonstrate independent tuning of crystalline polymorph and molecular orientation in contorted hexabenzocoronene (c-HBC) thin films.
To decouple and evaluate the impact of molecular packing and orientation on device performance.

Main Methods:

Post-deposition processing of c-HBC thin films to control polymorph and orientation.
Fabrication and characterization of thin-film transistors (TFTs) using c-HBC.
Analysis of field-effect mobility in relation to crystal structure and molecular orientation.

Main Results:

Achieved independent control over polymorph and molecular orientation without altering deposition conditions.
Observed three c-HBC polymorphs, including two previously unreported.
Demonstrated that both polymorphism and molecular orientation significantly impact TFT field-effect mobility, each by an order of magnitude.

Conclusions:

Independent tuning of crystal structure and molecular orientation is feasible via post-deposition processing.
Both molecular packing (polymorphism) and orientation are critical for optimizing charge transport in c-HBC TFTs.
This work provides a method to systematically study structure-property relationships in organic semiconductors.