Study of energy loss mechanisms in organic thin film solar cells by using quantum beam based analytical techniques

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In this research, we have investigated(1) electronic properties of electrode buffer layers by means of ultraviolet photoelectron spectroscopyand (2) the charge transfer speed at molecule/electrode interfaces by means of photoelectron spectroscopy and core-hole clock spectroscopy.It was found that electrondoping from metal to molecule results in effective electrode contact; that is, the high speed charge transfer of less than 10 fs happens at electrode interfaces. Moreover, it became clear that the electrondoping affected energy level alignment of two or more organic layers. Thus, control of electron doping at organic/metal interface is indispensable to selection of the optimal device structure, and it became clear to become a key to highly efficient OSCs.