Effectiveness of p-dopants in an organic hole transporting material

Lee, Jae-Hyun; Leem, Dong-Seok; Kim, Hyong-Jun; Kim, Jang-Joo
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p123306
Academic Journal
We investigated the effectiveness of p-dopants to generate holes in a hole transporting material by comparing the absorption in visible-near-infrared and infrared regions and current density-voltage characteristics. CuI, MoO3, and ReO3 having different work functions were doped in a hole transporting organic material, 4,4′,4″-tris(N-(2-naphthyl)-N-phenylamino)-triphenylamine (2TNATA). Formation of charge transfer (CT) complexes increases linearly with increasing doping concentration for all the dopants. Dopants with higher work function (ReO3>MoO3>CuI) are more effective in the formation of CT complexes and in the generation of the charges in the doped films.


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