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A novel technique – charge modulated electro‐absorption spectroscopy (CEMAS) – is reported by Franky So and co‐workers on page 2434 and used to determine the energy‐level alignment and the effective bandgap of organic heterojunctions. What makes CMEAS unique is that it can directly determine the interface energetics of donor–acceptor blends, not possible using conventional electro‐chemical methods...
Using charge modulated electroabsorption spectroscopy (CMEAS), for the first time, the energy level alignment of a polymer:fullerene bulk heterojunction photovoltaic cell is directly measured. The charge‐transfer excitons generated by the sub‐bandgap optical pumping are coupled with the modulating electric field and introduce subtle changes in optical absorption in the sub‐bandgap region. This minimum...
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