کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5375626 1504308 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exciton dynamics in alternating polyfluorene/fullerene blends
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Exciton dynamics in alternating polyfluorene/fullerene blends
چکیده انگلیسی
Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of morphology. We have also observed exciton-exciton energy transfer in these blends at low acceptor concentrations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 350, Issues 1–3, 23 June 2008, Pages 14-22
نویسندگان
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