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

Autor: Kun Rui Wu, Yi Chun Lai, Gou Chung Chi, Chi-Yuan Lin, Forest Shih-Sen Chien, Yang Yang Hsu, Kwai Kong Ng, Chen Shiung Chang, Peichen Yu
Rok vydání: 2015
Předmět:
Zdroj: Optics Express. 23:14344
ISSN: 1094-4087
DOI: 10.1364/oe.23.014344
Popis: 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 τd/τa. 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.
Databáze: OpenAIRE