Bolometric effect in a waveguide-integrated graphene photodetector

• 作 者: 王玉冰 尹伟红 韩勤 杨晓红 叶焓 吕倩倩 尹冬冬
• 机 构: State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of
• 出 处: Chinese Physics B
• 发表日期: 2016年11期
• 关键词: photodetector waveguide ultraviolet attributed letter fabricate exceeding optoel

Graphene is an alternative material for photodetectors owing to its unique properties.These include its uniform absorption of light from ultraviolet to infrared and its ultrahigh mobility for both electrons and holes.Unfortunately,due to the low absorption of light,the photoresponsivity of graphene-based photodetectors is usually low,only a few milliamps per watt.In this letter,we fabricate a waveguide-integrated graphene photodetector.A photoresponsivity exceeding0.11 A·W ~(-1) is obtained which enables most optoelectronic applications.The dominating mechanism of photoresponse is investigated and is attributed to the photo-induced bolometric effect.Theoretical calculation shows that the bolometric photoresponsivity is 4.6 A·W ~(-1).The absorption coefficient of the device is estimated to be 0.27 dB·μm ~(-1).

Graphene is an alternative material for photodetectors due to its unique properties. These includes its uniform absorption of light from ultraviolet to infrared and its ultrahigh mobility for both electrons and holes. Unfortunately, due to the low absorption of light, the photoresponsiveness of graphene-based photodetectors is usually low, only a few milliamps per watt. This letter, we fabricate a waveguide-integrated graphene photodetector. A photoresponsive given exceeding 0.11 A · W -1 is obtained which enables most optoelectronic applications. dominating mechanism of the photoresponse is investigated and is attributed to the photo-induced bolometric effect. The optical calculation shows that the bolometric response is 4.6 A · W -1. The absorption coefficient of the device is estimated to be 0.27 dB · μm -1 ).