| Budget Amount *help |
¥44,200,000 (Direct Cost: ¥34,000,000、Indirect Cost: ¥10,200,000)
Fiscal Year 2014: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2013: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2012: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
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| Outline of Final Research Achievements |
Ultrahigh-sensitivity ultraviolet photoelectron spectroscopy (UPS) was realized for radiation-sensitive organic materials and was used to investigate electronic states in band gap of organic semiconductors. The results show the striking effects for pentacene: exposure to inert gas (N2 and Ar) produces gap states and pushes the Fermi level closer to the valence band. The results demonstrate that these gap states originate from small imperfections in the molecular packing structure, which impact on the energy level alignment in various organic devices. Electronic band dispersions in insulating picene single crystals were measured by UPS coupled with laser-induced photoconductivity. Based on these fundamental studies, we fabricated C60 transistors using structure-controlled C60 thin film on DIP template/SiO2 gate insulator, and found that high electron mobility and high operational stability are achieved with the gap-states controlled C60 thin film transistors on the DIP/SiO2 gate.
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