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

Authors
 Soonyoung Cha  ;  Yoochan Hong  ;  Jaemoon Yang  ;  Inhee Maeng  ;  Seung Jae Oh  ;  Kiyoung Jeong  ;  Jin-Suck Suh  ;  Seungjoo Haam  ;  Yong-Min Huh  ;  Hyunyong Choi 
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.
Full Text
http://pubs.acs.org/doi/abs/10.1021/jp408800j
DOI
10.1021/jp408800j
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
5. Research Institutes (연구소) > Institute for Medical Convergence (연의-생공연 메디컬융합연구소) > 1. Journal Papers
5. Research Institutes (연구소) > Yonsei Integrative Research Institute for Cerebral & Cardiovascular Disease (뇌심혈관질환융합연구사업단) > 1. Journal Papers
Yonsei Authors
Suh, Jin Suck(서진석) ORCID logo https://orcid.org/0000-0001-9455-9240
Yang, Jae Moon(양재문) ORCID logo https://orcid.org/0000-0001-7365-0395
Oh, Seung Jae(오승재)
Jeong, Ki Young(정기영)
Huh, Yong Min(허용민) ORCID logo https://orcid.org/0000-0002-9831-4475
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/87768
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