| 초록 |
We present the ultrahigh performance of a hybrid photodetector of dye molecules and graphene, covering wavelengths in the infrared to ultraviolet range with high quantum efficiencies. The main mechanisms underlying the high performance of the hybrid photodetector are the enhancement of the absorption of light in graphene and the implementation of photocurrent gain, arising from the photoexcited charge transfer between graphene and dye molecules. Much higher photocurrent (~ mA at zero gate voltage) is generated in the hybrid photodetector compared with that (~pA) in a pure graphene photodetectors from the same amount of light. The proposed hybrid photodetectors, showing excellent weak signal detection with high responsivities (460 A/W), uniform photoresponse, high speeds (~millisecond), and broad spectral bandwidths (400 ＜ λ＜ 100) can be applied to graphene based optoelectronic devices. |
