کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1443902 | 1509482 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoconductivity in fullerene-doped polysilane thin films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
بیومتریال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Flash photolysis time-resolved microwave conductivity (FP-TRMC) measurements have been performed to study the transport properties of charge carriers in the polysilane films. The effect of C60 concentrations on photoconductivity of poly(methylphenylsilane) (PMPS) and poly(n-hexylphenylsilane) (PHPS) films has been studied using a variety of excitation light sources. The value of Ïâμ, which is the product of quantum efficiency of photocarrier generation (Ï) and sum of moibilities of the carriers (âμ), depends strongly on C60 concentration upon exposure of 532 nm. The quantum efficiency reaches â¼0.06 with C60 concentration at 5.7 mol%, and saturates at the higher concentrations. The Ïâμ value increases considerably upon exposure of 193 nm up to 1.22 Ã 10â3 cm2/Vs without significant dependence on C60 concentration, suggesting the direct formation of electron-hole pair by 6.39 eV photon absorption with the higher Ï value at â¼0.12. The present technique gave the estimates of intra-chain mobility of charge carriers in PMPS and PHPS, and one-order magnitude higher intra-chain mobility was observed in PHPS than that in PMPS. This is suggestive of a highly ordered Si backbone conformation in PHPS. The intra-chain mobility in PMPS, however, is at least two orders of magnitude higher than the mobility values estimated by conventional time-of-flight techniques. Thus we conclude that the higher mobility than â¼10â3 cm2/Vs (E â¼Â 0) is realizable even with PMPS by precise synthesis and device fabrication free from disordering, defects, impurities, etc.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 156, Issues 2â4, 1 February 2006, Pages 293-297
Journal: Synthetic Metals - Volume 156, Issues 2â4, 1 February 2006, Pages 293-297
نویسندگان
Anjali Acharya, Shu Seki, Akinori Saeki, Seiichi Tagawa,