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Ultrafast Spin-Resolved Spectroscopy Reveals Dominant Exciton Dynamics in Conducting Polymer Polyaniline

Authors
 Soonyoung Cha ; Yoochan Hong ; Hyunyong Choi ; Yong-Min Huh ; Seungjoo Haam ; Jin-Suck Suh ; Kiyoung Jeong ; Seung Jae Oh ; Inhee Maeng ; Jaemoon Yang 
Citation
 Journal of Physical Chemistry C, Vol.117(39) : 20371~20375, 2013 
Journal Title
 Journal of Physical Chemistry C 
ISSN
 1932-7447 
Issue Date
2013
Abstract
The conducting polymer polyaniline (PANI) has a wide range of optoelectronic applications due to its unique electronic and optical characteristics. Although extensive works have been performed to understand the equilibrium properties, the nature of the charge type that governs its nonequilibrium optical response has been barely understood; a number of studies have debated the nature of photogenerated charge type in PANI, specifically whether it is polaron or exciton based. Here, we report experimental evidence that the charge relaxation dynamics of PANI are dominated by excitons. Utilizing ultrafast spin-resolved pump–probe spectroscopy, we observed that PANI charge dynamics are strongly spin-polarized, exhibiting a spin Pauli-blocking effect. Investigations including both spin-independent and spin-dependent dynamics reveal that there is no spin-flip process involved in charge relaxation. This provides compelling evidence of an exciton-dominated photoresponse in PANI.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/87768
DOI
10.1021/jp408800j
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Radiology
1. 연구논문 > 1. College of Medicine > Yonsei Biomedical Research Center
1. 연구논문 > 5. Research Institutes > Institute for Medical Convergence
1. 연구논문 > 5. Research Institutes > Yonsei Integrative Research Institute for Cerebral & Cardiovascular Disease
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Link
 http://pubs.acs.org/doi/abs/10.1021/jp408800j
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