4,671 research outputs found
Organic photovoltaic bulk heterojunctions with spatially varying composition
Models of organic bulk heterojunction photovoltaics which include the effect
of spatially varying composition of donor/acceptor materials are developed and
analyzed. Analytic expressions for the current-voltage relation in simplified
cases show that the effect of varying blend composition on charge transport is
minimal. Numerical results for various blend compositions, including the
experimentally relevant composition of a donor-rich region near the cathode (a
"skin layer" of donor material), show that the primary effect of this variation
on device performance derives from its effect on photocharge generation. The
general relation between the geometry of the blend and its effect on
performance is given explicitly. The analysis shows that the effect of a skin
layer on device performance is small.Comment: 6 pages, 5 figure
Optical synchronization-phase locking with shot noise processes Interim technical report
Optical communication synchronization with phase lock tracking loop and analysis of shot noise processe
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