Charge carrier injection and transport in organic thin films

Toshinori Matsushima; Guang-He Jin; Yoshihiro Kanai; Tomoyuki Yokota; Seiki Kitada; Toshiyuki Kishi; Hideyuki Murata

doi:10.1117/12.793969

2 September 2008 Charge carrier injection and transport in organic thin films

Toshinori Matsushima, Guang-He Jin, Yoshihiro Kanai, Tomoyuki Yokota, Seiki Kitada, Toshiyuki Kishi, Hideyuki Murata

Proceedings Volume 7051, Organic Light Emitting Materials and Devices XII; 705112 (2008) https://doi.org/10.1117/12.793969
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

Abstract

Current density-voltage (J-V) characteristics of hole-only devices using indium tin oxide (ITO) anode and N,N'- diphenyl-N,N'-bis(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (α-NPD) layer were measured with various thicknesses of a molybdenum oxide (MoO₃) buffer layer inserted between ITO and α-NPD. The device with a 0.75-nm-thick MoO₃ layer forms Ohmic hole injection at the ITO/MoO₃/α-NPD interfaces and J-V characteristics of this device are controlled by a space-charge-limited current. Results of X-ray photoelectron and ultraviolet/visible/near-infrared absorption studies revealed that this Ohmic hole injection is attributable to electron transfers from ITO to MoO₃ and from α-NPD to MoO₃. Moreover, we demonstrated that the Ohmic hole injection is realized at the interfaces of ITO/rubrene and ITO/N,N'-di(m-tolyl)-N,N'-diphenylbenzidine (TPD) using an ultrathin MoO₃ layer as well.

Citation Download Citation

Toshinori Matsushima, Guang-He Jin, Yoshihiro Kanai, Tomoyuki Yokota, Seiki Kitada, Toshiyuki Kishi, and Hideyuki Murata "Charge carrier injection and transport in organic thin films", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 705112 (2 September 2008); https://doi.org/10.1117/12.793969

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