Enhanced bulk conductivity and bipolar transport in mixtures of MoO_x and organic hole transport materials

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• 作者：Baolin Tian ; Dayan Ban ; Hany Aziz ; ^{hany.aziz@ecemail.uwaterloo.ca}
• 关键词：Molybdenum oxide (MoOx) ; Lateral structure ; Bulk conductivity ; Bipolar transport
• 刊名：Thin Solid Films
• 出版年：2013
• 出版时间：1 June, 2013
• 年：2013
• 卷：536
• 期：Complete
• 页码：202-205
• 全文大小：672 K

文摘

We study the conductivity of thin films of molybdenum oxide (MoO_x) mixed with an organic hole transport material, such as N,N¡ä-bis(naphthalen-1-yl)-N,N¡ä-bis (phenyl)benzidine or 4¡ä,4¡å-tri(N-carbazolyl)triphenylamine, in lateral test devices. Contrary to previous reports, the conductivity of the mixture is found to exceed that of neat MoO_x, exhibiting ~ 5 orders of magnitude higher conductivity in comparison to the neat films. Studies also show that the mixing enhances both hole and electron transport. The higher conductivity may be attributed to a higher concentration of ¡°free¡± carriers in the mixture, as a result of the formation of a charge transfer complex between the MoO_x and the hole transport material. The findings shed light on the potential of hybrid composites of inorganic and organic materials in realizing enhanced conductivity.