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High responsivity sensing of unfocused laser and white light using graphene photodetectors grown by chemical vapor deposition

Q. Liu ; J. Deng ; C. Xu ; Y. Xie ; Y. Dong ; G. Pan ; Jie Sun (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Optical Materials Express (2159-3930). Vol. 6 (2016), 7, p. 2158-2164.
[Artikel, refereegranskad vetenskaplig]

Graphene photodetectors grown by chemical vapor deposition are fabricated for unfocused laser and white light sensing. The unfocused light enlarges the illuminated graphene area and mimics the real-life sensing conditions, yielding a responsivity of 104 mA/W at room temperature without enhancing absorbance by waveguide and plasmonics. The devices are based on positive photoconductivity from the electron-hole photocarrier pairs and the bolometric-effect-induced negative photoconductivity. The buried off-center local gate induces a net internal potential in the graphene. The relative strength of the two photoconductivities depends on the gate voltage. The technology is scalable, which is a step ahead toward real applications.



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Denna post skapades 2016-11-15. Senast ändrad 2016-11-15.
CPL Pubid: 245150

 

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