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Solution-processable organic conductors and semiconductors for thin-film electronics

The ability to replace thermally-evaporated metal and organic semiconductors with solution-processable counterparts as active device components will lower capital and operational costs associated with thin-film electronics fabrication. We are examining the processing-structure-property relationships of these materials to assess their viability. Current research efforts in this area focus on water-dispersible, conductive polyaniline and several p-type solution-processable anthradithiophenes.  These materials, respectively, find use as electrodes and active layers in organic transistors and solar cells.

Soft lithography and soft-contact lamination for plastic electronics

The chemical- and mechanical fragility of organic semiconductors calls for the development of non-invasive patterning technologies for establishing efficient electrical contact. Our group has developed nanotransfer printing (nTP), soft-contact lamination (scL) and stamp-and-spin-cast as means to fabricate functional organic thin-film devices. Research in this area continues to explore elastomeric-stamp-based patterning schemes for creating high-resolution functional features on rigid and flexible substrates over large areas.  These features are either directly transferred onto or laminated against the electrically-active components to complete the circuits of organic transistors and solar cells.

Self-assembled monolayers facilitate interfacial engineering in organic solar cells

Previously, our efforts in this area entailed the understanding the assembly of conjugated molecules on metal and semiconductor surfaces. High-resolution spectroscopic techniques, including transmission and reflectance infra-red spectroscopy and synchrotron-based near-edge X-ray absorption fine structure spectroscopy were used to elucidate the ensemble-averaged structure and orientation of the molecular assembly. Current work builds on our previous know-how; we are exploiting the molecular dipoles induced by and surface energy presented by the organization of self-assembled monolayers to engineer the electrode-photo-active later interface in organic solar cells.

External Fellowships and Scholarships to Team Members

NSF Integrative Graduate Education and Research Traineeship Fellowship in Nanotechnology for Clean Energy to AMH
National Defense Science and Engineering Graduate Fellowship to SSL, AMH, GEP, JCH
NSF Graduate Fellowship to KBG, JDT, AKH, NCD
Department of Homeland Security Fellowship to TLB
Dreyfus Post-doctoral Fellowship in Environmental Chemistry to JMM
Intelligence Community Post-doctoral Fellowship to MRM

ExxonMobil Emerging Technology Fellowship to KCG

Il Ju Academic Foundation Overseas Graduate Fellowship to KSL

Intel Undergraduate Research Fellowship to SHC
REU Supplemental Grant to CAREER Award to RT, SRM