Incomplete Exciton Harvesting from Fullerenes in Bulk Heterojunction Solar Cells

We investigate the internal quantum efficiencies (IQEs) of high efficiency poly-3-hexylthiophene:[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) solar cells and find them to be lower at wavelengths where the PCBM absorbs. Because the exciton diffusion length in PCBM is too small, excitons gen...

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Veröffentlicht in:	Nano letters 2009-12, Vol.9 (12), p.4037-4041
Hauptverfasser:	Burkhard, George F, Hoke, Eric T, Scully, Shawn R, McGehee, Michael D
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Electric Power Supplies Electron states Energy Equipment Design Equipment Failure Analysis Exact sciences and technology Excitons and related phenomena Fullerenes - chemistry Fullerenes - radiation effects Fullerenes and related materials diamonds, graphite Light Materials science Natural energy Organoselenium Compounds - chemistry Organoselenium Compounds - radiation effects Photovoltaic conversion Physics Solar cells. Photoelectrochemical cells Solar Energy Specific materials
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Zusammenfassung:	We investigate the internal quantum efficiencies (IQEs) of high efficiency poly-3-hexylthiophene:[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) solar cells and find them to be lower at wavelengths where the PCBM absorbs. Because the exciton diffusion length in PCBM is too small, excitons generated in PCBM decay before reaching the donor−acceptor interface. This result has implications for most state of the art organic solar cells, since all of the most efficient devices use fullerenes as electron acceptors.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl902205n