Quantized Interface Roughness of Organic Solar Cells Thomas Gredig, California State University-Long Beach Foundation, DMR 0847552.
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Commercialization of organic solar cells appears to be feasible with recently reported power conversion efficiencies of 8-10% for specialized cells. The nanoscale interface between zinc phthalocyanine and fullerene is particularly important in order to maximize the performance.
We have quantified the surface structure and controllably varied the surface roughness and crystalline size in the organic solar cell prototype, shown in (a). The solar cell performance strongly depends on the deposition parameters as shown for 6 solar cells in (b). The resulting power efficiency and fill factor have a prominent peak near 160 oC, shown in (c), suggesting that roughness and grain size, both controlled by deposition temperature, play an important role.
T. Gredig et al. Phys. Rev B, 86, 014409 (2012).
We created a professionally edited five-minute movie featuring the research lab, and research students working there. The movie is aimed to interest high school students in nanotechnology research. The PI included his personal story that led to his career in the field.
Top: Two scenes from the movie.
Middle: Group of local high school teachers and their students coming to view the first showing of the movie, presentation, and get a hands-on experience with solar cells (T. Gredig, back row third from right)
Bottom: Four students from “Phun Physics Phor Phemales” who are visiting the Gredig research lab. About 8 groups of 3-20 students are guided annually and provided with a tour and the movie.