Charge Carrier Dynamics in Bulk Heterojunction Organic Semiconductor by Optical-Pump Terahertz-Probe Spectroscopy

被引：0
|
作者：
Hiramatsu, Yuichi [1 ]
Ohta, Kaoru [1 ,2 ]
Takahashi, Kohtaro [3 ]
Suzuki, Mitsuharu [3 ]
Yamada, Hiroko [3 ]
Tominaga, Keisuke [1 ,2 ]
机构：
[1] Kobe Univ, Grad Sch Sci, Kobe, Hyogo 6578501, Japan
[2] Kobe Univ, Mol Photosci Res Ctr, Kobe, Hyogo 6578501, Japan
[3] Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300192, Japan
来源：
2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) | 2018年
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中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We use optical-pump terahertz (THz)-probe spectroscopy to investigate charge carrier dynamics in bulk heterojunction (BHJ) organic semiconductor thin films based on diketopyrrolopyrrole-linked tetrabenzoporphyrin and fullerene derivative (PCBM). Transient THz signals decay with time constants of 0.7 ps and 18 ps. Compared with BP:PCBM thin film, we find that mobile charge carriers survive on a longer time scale. Furthermore, the amplitude of the fast decay components depends on the excitation fluence, which is due to charge pair annihilation at the higher carrier density.
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页数：2
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