Electrical and optical properties of Co-doped and undoped MoS2

Tsung Shine Ko, Cheng Ching Huang, Der Yuh Lin, Yan Jia Ruan, Ying Sheng Huang

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

Co-doped and undoped layered MoS2 crystals were grown by the chemical vapor transport method using iodine as the transport agent. Both reflectance and piezoreflectance measurements reveal two exciton transitions of the direct band edge around 1.86 and 2.06 eV for undoped MoS2 and 1.84 and 2.03 eV for Co-doped MoS2. Hall effect measurements show that the Co-doped MoS2 sample has a lower carrier concentration and mobility than the undoped sample. These differences between undoped and Co-doped MoS2 were attributed to the effect of cobalt atoms causing a small lattice distortion, lattice imperfections and/or impurity states that form trap states between the conduction band and valence band. Furthermore, photoconductivity (PC) and persistent PC results show that Co-doped MoS2 has a longer time constant and better responsivity than undoped MoS2. This work discusses the advantages of Co-doped MoS2 for photodetector applications.

原文English
文章編號04EP06
期刊Japanese Journal of Applied Physics
55
發行號4
DOIs
出版狀態Published - 2016 四月

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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