کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9776220 | 1509483 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quadrimolecular recombination kinetics of photogenerated positive polarons and C60â radical anions in regioregular poly(3-alkylthiophene)/C60 composites measured by light-induced ESR
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
بیومتریال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Light-induced electron spin resonance (LESR) measurements have been performed to study recombination kinetics of photogenerated charge carriers in the composites of regioregular poly(3-alkylthiophene) (RR-PAT) and C60. Two transient LESR signals due to photogenerated positive RR-PAT polarons and C60â radical anions are remarkably enhanced for the excitation energy of â¼1.8Â eV. We observe an â¼Iex0.25 power dependence of the prompt decay LESR component on excitation-light intensity Iex. This behavior is well explained by a model of quadrimolecular recombination (QR) of the photogenerated charge carriers. The QR is dominant at higher Iex while bimolecular recombination (BR) is relatively important at lower Iex. The time decay of the LESR intensity is also well explained by the QR model. The temperature dependence of the QR rate constant shows a crossover from tunneling to hopping behavior with increasing temperature; the activation energy for the hopping of 0.10Â eV is obtained. In the regiorandom PAT/C60 composites, only BR is observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 154, Issues 1â3, 22 September 2005, Pages 85-88
Journal: Synthetic Metals - Volume 154, Issues 1â3, 22 September 2005, Pages 85-88
نویسندگان
K. Marumoto, T. Sakamoto, Y. Muramatsu, S. Kuroda,