Elucidation of Electronic Properties of Organic Semiconductors by Direct Observation of Frontier Density of States

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In order to understand the mechanism of electronic devices using organic molecules, it is indispensable to elucidate how electrons are stored in molecules. So far, it has been investigated focusing on electronic states such as HOMO and LUMO. But other electronic states called gap s t at e s , whose density is less than one thousandth of HOMO, is also important for device physics. In this study, we have developed an apparatus to directly measure such gap states, and investigated the electronic structures of various organic semiconductors.