Influence of Processing Additives on Charge-Transfer Time Scales and Sound Velocity in Organic Bulk Heterojunction Films
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- 作者：Loren G. Kaake ; Gregory C. Welch ; Daniel Moses ; Guillermo C. Bazan ; Alan J. Heeger
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：May 17, 2012
- 年：2012
- 卷：3
- 期：10
- 页码：1253-1257
- 全文大小：271K
- 年卷期：v.3,no.10(May 17, 2012)
- ISSN：1948-7185
文摘
The role of processing additives in organic bulk heterojunction thin films was investigated by means of transient absorption spectroscopy. The rate of ultrafast charge transfer was found to increase when a small amount of diiodooctane was used during film formation. In addition, coherent acoustic phonons were observed, and their velocity was determined. A strong correlation between the sound velocity and the charge-transfer time scale was observed, both of which could be explained by a subtle increase in thin film density.