Molecular Self-Assembly and Interfacial Engineering for Highly Efficient Organic Field Effect Transistors and Solar Cells
Final rept. Jun 2009 - Jun 2012
WASHINGTON UNIV SEATTLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Versatile surface and interface tailoring has been realized through molecular monolayers, polymer nanolayers or peptide monolayers. Insulating and semiconducting molecular phosphonic acid PA self-assembled monolayers SAMs have been developed for applications in organic field-effect transistors OFETs for low-power, low-cost flexible electronics. Multifunctional SAMs on ultrathin metal oxides, such as hafnium oxide and aluminum oxide, are shown to enable 1 low-voltage sub 2V OFETs through dielectric and interface engineering on rigid and plastic substrates, 2 simultaneous one-component modification of sourcedrain and dielectric surfaces in bottom-contact OFETs, and 3 SAM-FETs based on molecular monolayer semiconductors. The combination of excellent dielectric and interfacial properties results in OFETs with low-subthreshold slopes down to 75 mVdec, high IonIoff ratios of 105- 107, contact resistance down to 700 Omega cm, charge carrier mobilities of 0.1-4.6 cm2V s, and general applicability to solution-processed and vacuum-deposited n-type and p-type organic and polymer semiconductors. 4 Polystyrene PS nanolayer as interface for OFETs, 5 threshold voltage control in OFETs with dielectric layer modified by the genetically engineered polypeptide GEP and 6 graphene oxide GO nanosheet-based OFETs and one diode-one resistor cell arrays for non-volatile memory have been also achieved. 7 Exquisite control of molecules is reached by monolayer assemblyconfinement, and monitored by photon-STM for molecular motions, reactions and conductance in ground state and excited state.
- Electrical and Electronic Equipment
- Electric Power Production and Distribution
- Atomic and Molecular Physics and Spectroscopy