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Simultaneous cross-linking and p-doping of a polymeric semiconductor film by immersion into a phosphomolybdic acid
Naoya Aizawa1, Canek Fuentes-Hernandez2, Vladimir A Kolesov2
1INAMORI Frontier Research Center, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. aizawa@ifrc.kyushu-u.ac.jp.
Abstract:
Poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) is shown to be simultaneously cross-linked and p-doped when immersed into a phosphomolybdic acid solution, yielding conductive films with low solubility that can withstand the solution processing of subsequent photoactive layers. Such a modified PCDTBT film serves to improve hole collection and limit carrier recombination in organic solar cells.
