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Updated: Jul 7, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
11:30

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

Published on: March 6, 2017

ポリチオフェン/フルレンの混合フィルムにおける電荷载体形成は,一時吸収スペクトロスコピーで研究された

Hideo Ohkita1, Steffan Cook, Yeni Astuti

  • 1Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom. ohkita@photo.polym.kyoto-u.ac.jp

Journal of the American Chemical Society
|February 19, 2008
PubMed
まとめ

この研究では,ポリチオフェンフィルムとその混合物をPCBMと比較し,有機太陽電池における効率的な電荷生成には,光発光滅よりも電荷分離のエネルギー差が大きいことが明らかになりました. この発見は,より良い太陽電池性能のための材料の最適化を導く.

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UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...