Biologically inspired graphene-chlorophyll phototransistors with high gain

Shao Yu Chen, Yi Ying Lu, Fu Yu Shih, Po Hsun Ho, Yang Fang Chen, Chun Wei Chen, Yit Tsong Chen, Wei Hua Wang

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63 Citations (Scopus)


We present prominent photoresponse of bio-inspired graphene-based phototransistors sensitized with chlorophyll molecules. The hybrid graphene-chlorophyll phototransistors exhibit a high gain of 106 electrons per photon and a high responsivity of 106 A/W, which can be attributed to the integration of high-mobility graphene and the photosensitive chlorophyll molecules. The charge transfer at interface and the photogating effect in the chlorophyll layer can account for the observed photoresponse of the hybrid devices, which is confirmed by the back-gate-tunable photocurrent as well as the thickness and time dependent studies of the photoresponse. The demonstration of the graphene-chlorophyll phototransistors with high gain envisions a viable method to employ biomaterials for graphene-based optoelectronics.

Original languageEnglish
Pages (from-to)23-29
Number of pages7
Publication statusPublished - 1 Nov 2013
Externally publishedYes

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