Optical-power-dependent photodesorption kinetics of graphene studied by conductance response

Yang Yang Hsu, Chi Yuan Lin, Yi Chun Lai, Kun Rui Wu, Kwai Kong Ng, Chen Shiung Chang, Gou Chung Chi, Peichen Yu, Forest Shih Sen Chien

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The photodesorption kinetics of graphene with various UV laser power is studied by conductance response. Analytical expressions of the power-dependent photodesorption kinetics of graphene in ambience are derived. The photodesorption time constant τd, steady current, and magnitude of modulation current, can be expressed as functions of the adsorption time constant τa, desorption cross section σ, and photon flux density. Under illumination the steady occupation ratio of adsorbed O2 on graphene is equal to τda. It is suggested that the photodesorption of O2 on graphene is attributed the injection of photogenerated hot electrons and is restricted by the density of antibonding states of O2.

Original languageEnglish
Pages (from-to)14344-14350
Number of pages7
JournalOptics Express
Issue number11
StatePublished - 1 Jan 2015

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