期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 3, 期 10, 页码 1253-1257出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz300365b
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资金
- Center for Energy Efficient Materials, an Energy Frontier Research Center
- Office of Basic Energy Sciences of the U.S. Department of Energy [DE-DC0001009]
- AFOSR [FA9550-11-1-0063]
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.
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