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Fundamental Investigations of the Microstructure of Semicrystalline Polymers for Alternative Energy Generations Alberto Salleo, Materials Science and Engineering, Stanford University Stanford, CA 94305 The electronic performance of conjugated polymers in solar cells, LEDs and transistors depends on the microstructure of the polymer at organic/inorganic interfaces. The inorganic counterpart of the polymer might be an inorganic crystal in a bulk heterojunction solar cell, a gate dielectric in transistors or a metal contact in LEDs. Our goal is to prepare transmission electron microscopy (TEM) foils of inorganic/organic interfaces to characterize them with high resolution. We have succeeded in preparing such samples by focused ion beam (FIB) milling and have started characterizing them. We started with a simpler system where the organic semiconductor is crystalline (pentacene). Future work will involve characterizing the pentacene layer and extending the sample study to bulk heterojunction solar cells. Al Pc pentacene Si TEM cross-section of a Si/Al/pentacene multilayer