A device with two kinds of functions -Ultraviolet photodetector and electroluminescence: Fabrication and carrier transport mechanism

作者：Zhou, Hai^*; Fang, Guojia; Zhu, Yongdan; Liu, Nishuang; Wang, Haoning; Huang, Huihui; Li, Songzhan; Zhao, Xingzhong

来源：EPL, 2012, 97(6): 68001.

DOI：10.1209/0295-5075/97/68001

We reported an n-ZnO/n-GaN heterojunction device in which both ultraviolet (UV) detecting and electroluminescence performances of the device are controlled by the applied forward-bias voltage. For ZnO-based UV photodetectors, our devices showed excellent photoresponse characteristics with detectivity of similar to 2.80 x 10(13) cm Hz(1/2)/W and responsivity of similar to 276 A/W at 2 V. UV and visible electroluminescences of the device were also observed. Also, a Mn:ZnO/GaN heterojunction had been prepared and it also possessed the two functions. Furthermore, the Mn : ZnO/GaN device showed better UV detectivity and enlarged the visible emission. The reason for our devices possessing two functions had been explored through the carrier transport mechanism and the channel current formation diagram.

• 出版日期2012-3
• 单位武汉大学