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Photocurrent Generation in Nanostructured Organic Solar Cells

doi: 10.1021/nn700447t
pmid: 19206500
Photocurrent generation in nanostructured organic solar cells is simulated using a dynamical Monte Carlo model that includes the generation and transport properties of both excitons and free charges. Incorporating both optical and electrical properties, we study the influence of the heterojunction nanostructure (e.g., planar vs bulk junctions) on donor-acceptor organic solar cell efficiencies based on the archetype materials copper phthalocyanine (CuPc) and C(60). Structures considered are planar and planar-mixed heterojunctions, homogeneous and phase-separated donor-acceptor (DA) mixtures, idealized structures composed of DA pillars, and nanocrystalline DA networks. The thickness dependence of absorption, exciton diffusion, and carrier collection efficiencies is studied for different morphologies, yielding results similar to those experimentally observed. The influences of charge mobility and exciton diffusion length are studied, and optimal device thicknesses are proposed for various structures. Simulations show that, with currently available materials, nanocrystalline network solar cells optimize both exciton diffusion and carrier collection, thus providing for highly efficient solar energy conversion. Estimations of achievable energy conversion efficiencies are made for the various nanostructures based on current simulations used in conjunction with experimentally obtained fill factors and open-circuit voltages for conventional small molecular weight materials combinations.
- College of New Jersey United States
- Materials Science & Engineering Australia
- University of Michigan–Flint United States
- Commonwealth Scientific and Industrial Research Organisation Australia
Photochemistry, Equipment Design, Nanostructures, Equipment Failure Analysis, Electric Power Supplies, Solar Energy, Computer-Aided Design, Nanotechnology, Organic Chemicals, Particle Size
Photochemistry, Equipment Design, Nanostructures, Equipment Failure Analysis, Electric Power Supplies, Solar Energy, Computer-Aided Design, Nanotechnology, Organic Chemicals, Particle Size
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