Exploration of organic electronics materials

Light-weight organic materials with good mechanical flexibility and solubility in organic solvents are important constituents for achieving organic, printable, flexible, large-area electronics without the aid of vacuum or high-temperature process. We aim at improving the performance, stability, reliability, and compatibility with printing processes in organic semiconductors for transistors and photovoltaic cells and in organic ferroelectrics for nonvolatile memories and sensors.

Topics presented so far:

1.Exploration of High-Performance and Printable Materials

We are conducting research into the development of organic functional materials that are anticipated to prove useful in organic electronics elements such as ferroelectric field-effect transistors (FeFET), sensors, piezoelectric sheets, organic photovoltaic cells with large-area applications and mechanical flexibility. AIST has recently succeeded in developing ferroelectrics with high spontaneous polarization at room temperature based on the proton-transfer mechanism, and we are now working on improving the processes for the fabrication of thin-film devices.

2.Organic Photovoltaics Utilizing Intermolecular Charge-Transfer Excitation

It is known that the conversion efficiency of organic photovoltaic cell is limited by the diffusion length of the excited states. We found that intermolecular charge-transfer excitation yields a much longer diffusion length than intramolecular excitation as used for conventional organic photovoltaic cells.

To know more detail ..

Phys. Rev. Lett. 105, 226601 (2010) .