Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scaleShow others and affiliations
2012 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 134, p. 11836-11839Article in journal (Refereed) Published
Abstract [en]
The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ∼1015 photons/cm2 per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (∼0.1 cm2 V–1 s–1) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2012. Vol. 134, p. 11836-11839
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Identifiers
URN: urn:nbn:se:liu:diva-175370DOI: 10.1021/ja301757yISI: 000306724500003Scopus ID: 2-s2.0-84864213087OAI: oai:DiVA.org:liu-175370DiVA, id: diva2:1548158
2021-04-292021-04-292022-03-16Bibliographically approved