Geminate Charge Recombination in Alternating Polyfluorene Copolymer/Fullerene Blends
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- 作者：Swati De ; Torbjö ; rn Pascher ; Manisankar Maiti ; Kim G. Jespersen ; Tero Kesti ; Fengling Zhang ; Olle Inganä ; s ; Arkady Yartsev ; Villy Sundströ ; m
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：July 11, 2007
- 年：2007
- 卷：129
- 期：27
- 页码：8466 - 8472
- 全文大小：144K
- 年卷期：v.129,no.27(July 11, 2007)
- ISSN：1520-5126
文摘
By measuring excited state and charge dynamics in blends of an alternating polyfluorenecopolymer and fullerene derivative over nine orders in time and two orders in light intensity, we havemonitored the light-induced processes from ultrafast charge photogeneration to much slower decay ofcharges by recombination. We find that at low light intensities relevant to solar cell operation relatively fast(~30 ns) geminate recombination is the dominating charge decay process, while nongeminate recombinationhas a negligible contribution. The conclusion of our work is that under solar illumination conditions geminaterecombination of charges may be directly competing with efficient charge collection in polymer/fullerenesolar cells.