Journal
ADVANCED ENERGY MATERIALS
Volume 2, Issue 10, Pages 1246-1253Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201200103
Keywords
conjugated polymers; fullerenes; organic electronics; photovoltaic devices; solar cells
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Funding
- STW/NWO [VENI 11166]
- FOM/Nuon Joint Solar Programme
- National Science Foundation [DMR-1006930]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006930] Funding Source: National Science Foundation
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Three different theoretical approaches are presented to identify pathways to organic solar cells with power conversion efficiencies in excess of 20%. A radiation limit for organic solar cells is introduced that elucidates the role of charge-transfer (CT) state absorption. Provided this CT action is sufficiently weak, organic solar cells can be as efficient as their inorganic counterparts. Next, a model based on Marcus theory of electronic transfer that also considers exciton generation in both the electron donor and electron acceptor is used to show how reduction of the reorganization energies can lead to substantial efficiency gains. Finally, the dielectric constant is introduced as a central parameter for efficient solar cells. By using a driftdiffusion model, it is found that efficiencies of more than 20% are within reach.
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