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Conductivity Enhancement of PEDOT:PSS via Addition of Chloroplatinic Acid and Its Mechanism
Wu, Falin1; Li, Pengcheng2; Sun, Kuan1; Zhou, Yongli1; Chen, Wei1,3; Fu, Jiehao1,3; Li, Meng1; Lu, Shirong3; Wei, Dongshan3; Tang, Xiaosheng4
2017-07-01
摘要Readily obtained highly conductive, transparent, and flexible poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films is urgently needed in printing of flexible transparent electrodes. A simple and facile method to enhance the electrical conductivity of PEDOT:PSS films is reported. The conductivity is increased by four orders of magnitude after adding solid chloroplatinic acid (H2PtCl6) into the pristine PEDOT:PSS solution. The H2PtCl6-doped PEDOT:PSS film exhibits a sheet resistance of 44 +/- 5 Omega square(-1) and a transmittance of 84 +/- 1% at 550 nm, corresponding to a figure of merit of 47 +/- 4. Comparative study shows addition of solid acid like H2PtCl6 is more effective in conductivity enhancement than addition of polar organic solvents, such as dimethyl sulfoxide or ethylene glycol. The mechanism for the conductivity enhancement is attributed to both in situ doping and phase separation of PEDOT:PSS. PEDOT is oxidized and doped by Pt4+ of H2PtCl6, which is reduced simultaneously to Pt2+. Proton transfer from H2PtCl6 to PSS- of PEDOT:PSS causes formation of neutral PSSH, leading to phase separation between insulating PSS and conducting PEDOT. Such a phase separation results in conformational changes of PEDOT chains and reduction in energy barrier for charge hopping.
关键词conductivity flexible electronics poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) transparent electrodes
DOI10.1002/aelm.201700047
发表期刊ADVANCED ELECTRONIC MATERIALS
ISSN2199-160X
卷号3期号:7页码:10
通讯作者Sun, KA (reprint author), Chongqing Univ, Sch Power Engn, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China. ; Ouyang, JY (reprint author), Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore.
收录类别SCI
WOS记录号WOS:000405205300012
语种英语