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6592077 
Journal Article 
Minimization of contact resistance between metal and polymer by surface doping 
Mukherjee, AK; Thakur, AK; Takashima, W; Kaneto, K; , 
2007 
Yes 
Journal of Physics D: Applied Physics
ISSN: 0022-3727
EISSN: 1361-6463 
IOP PUBLISHING LTD 
BRISTOL 
1789-1793 
WOS:000245291700043 
The technique of surface doping is used to reduce the contact resistance between Au and poly(3-hexylthiophen-2,5-diyl) (P3HT) in Au(bottom)/P3HT/Au(top) sandwich type cells. To implement this technique, dodecyl benzene sulfonic acid (DBSA) is found to be an effective bulky dopant of P3HT as confirmed by four probe conductivity measurements, absorption and photoluminescence spectra. Sandwich cells treated with DBSA showed electrical short due to diffusion of DBSA across the P3HT film in Au(bottom)/DBSA/P3HT/DBSA/Au(top) sandwich cells, which confirms that DBSA is not immobilized at the surface. To restrict DBSA primarily at the surface, an aqueous solution of poly(ethylenedioxy thiophene) stabilized in poly(styrene sulfonic acid) (PEDOT:PSS) is utilized to make an emulsion with DBSA. The application of this emulsion at the top and bottom Au/P3HT interface has resulted in a decrease of contact resistance by nearly four orders of magnitude.