The Effect of Oxygen Uptake on Charge Injection Barriers in Conjugated Polymer Films

Bao, QinyeLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten,East China Normal Univ, Peoples R China; Soochow Univ, Peoples R China (author)

Funding Agencies|National Science Foundation of China [11604099]; ECNU Team Building grant; Fundamental Research Funds for the Central Universities; Swedish Foundation for Strategic Research [SE13-0060]; Swedish Research Council [2016-05498]; Goran Gustafsson Foundation for Research in Nature Sciences and Medicine; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]
The energy offset between the electrode Fermi level and organic semiconductor transport levels is a key parameter controlling the charge injection barrier and hence efficiency of organic electronic devices. Here, we systematically explore the effect of in situ oxygen exposure on energetics in n-type conjugated polymer P(NDI2OD-T2) films. The analysis reveals that an interfacial potential step is introduced for a series of P(NDI2OD-T2) electrode contacts, causing a nearly constant downshift of the vacuum level, while the ionization energies versus vacuum level remain constant. These findings are attributed to the establishment of a so-called double-dipole step via motion of charged molecules and will modify the charge injection barriers at electrode contact. We further demonstrate that the same behavior occurs when oxygen interacts with p-type polymer TQ1 films, indicating it is possible to be a universal effect for organic semiconductOrs.

NATURVETENSKAP Kemi Annan kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Other Chemistry Topics hsv//eng
charge injection; barrier; spectroscopy; conjugated polymer; organic electronics

Liu, XianjieLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)xiali21 (author)
Braun, SlawomirLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)slama19 (author)
Yang, JianmingEast China Normal Univ, Peoples R China (author)
Li, YanqingSoochow Univ, Peoples R China (author)
Tang, JianxinSoochow Univ, Peoples R China (author)
Duan, ChungangEast China Normal Univ, Peoples R China (author)
Fahlman, MatsLinköpings universitet,Ytors Fysik och Kemi,Tekniska fakulteten(Swepub:liu)matfa21 (author)
Linköpings universitetYtors Fysik och Kemi (creator_code:org_t)

In:ACS Applied Materials and Interfaces: AMER CHEMICAL SOC10:7, s. 6491-64971944-82441944-8252

By the author/editor: Bao, Qinye; Liu, Xianjie; Braun, Slawomir; Yang, Jianming; Li, Yanqing; Tang, Jianxin; show more...; Duan, Chungang; Fahlman, Mats; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Other Chemistry ...

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