Organic devices have been extensively studied for future multi-functional electronics by a wide variety of research groups in the world. The organic devices (transistor and solar cell) have many advantages which can be expressed by the following key words: flexibility, light-weight, transparent, large-area coverage, low-cost / low-temperature fabrication, ease-of-design… Thus, the organic electronic devices can have multi-functionality as well as contribute to low-energy consumption for future sustainability of society. Nevertheless, the performance of organic devices is still low in comparison with electronic devices based on Si and inorganic materials; the mobility of transistor is ~ 1cm2 V-1 s-1 in organic thin film field-effect transistor (FET), while the efficiency of light-electric power conversion is less than 10%. One of the most important research subjects is to realize organic FETs exhibiting high mobility comparable to those of Si / inorganic FERTs. Recently, our group is working on fabrication and characterization of FETs with phenacene-type molecules. The field-effect mobility of our group’s FET (phenacene thin film FET) is comparable to the world record, 7 - 8 cm² V^-1 s^-1, of organic thin film FET. We are further improving the performance of phenacene thin film and single crystal FETs by interface control and materials design. The interface control in organic electronic devices is significant from view of both pure and applied physics, and techniques of interface control are closely related to chemistry. Also, materials design is in the center of research of chemistry. We are enjoying physics and chemistry in the research of organic electronics.