Carrier behavior in special multilayer device composed of different transition metal oxide-based intermediate connectors

Yan-Hong Deng, Xiang-Yu Chen, Qing-Dong Ou, Qian-Kun Wang, Xiao-Cheng Jiang, Dan-Dan Zhang, Yan-Qing Li

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The impact of illumination on the connection part of the tandem organic light-emitting diodes was studied by using a special organic multilayer sample consisted of two organic active layers coupled with different transition metal oxide (TMO)-based intermediate connectors (ICs). Through measuring the current density-voltage characteristic, interfacial electronic structures, and capacitance-voltage characteristic, we observe an unsymmetrical phenomenon in current density-voltage and capacitance-voltage curves of Mg:Alq 3/MoO3 and MoO3 composed devices, which was induced by the charge spouting zone near the ICs region and the recombination state in the MoO3 layer. Moreover, Mg:Alq3/MoO3 composed device displays a photovoltaic effect and the Voc shifts to forward bias under illumination. Our results demonstrate that the TMO-based IC structure coupled with photovoltaic effect can be a good approach for the study of photodetector, light sensor, and so on.

Original languageEnglish
Article number221104
Number of pages5
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 2 Jun 2014
Externally publishedYes

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