Title: Structural development in molecular electronics for thin film applications
Speaker: Prof. Lynn Loo, PhD
Date&Time: 10:00 a.m., October 8
Venue: C201
Abstract:
In my talk today, I will highlight our recent work to elucidate processing-structure-function relationships of molecular semiconductors for thin-film transistor and solar cell applications. I will share three examples:
1. Using simple functionalization chemistries, we have synthesized a series of electron-deficient contorted hexabenzocoronenes and demonstrated their utility as electron acceptors in solar cells. These materials are amorphous as deposited; subsequent post-deposition processing imparts selectivity in both preferential out-of-plane molecular orientation and polymorphism.
2. Using post-deposition solvent vapor annealing we have been able to reversible access two polymorphism in core-chlorinated naphthalene dioxides. We show that in addition to polymorph selection, having in-plane charge transport isotropy is critical for thin-film transistor applications, particularly when the active layer is polycrystalline in nature.
3. We demonstrate we can guide in plane crystallization of triethylsilylethynyl anthradithiophene . In doing so, we have been able to isolate low angle from high angle boundaries and examine their relative contributions to charge transport quantitatively.
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