Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 35, Pages 14804-14810Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp104846h
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Funding
- The Netherlands Organization for Scientific Research (NWO)
- Senter/Novem in the EOS [EOSLT03026]
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Changes in the optical constants of a layer of ZnO nanoparticles (5 nm diameter) induced by UV illumination in O-2-free atmosphere are determined by using spectroscopic ellipsometry. The onset of optical absorption of ZnO shifts to higher photon energy after illumination. This is interpreted in terms of a Moss-Burstein shift. From the magnitude of the shift, the charge carrier density in the conduction band after UV illumination was determined to be 2 x 10(19) cm(-3), about one carrier per particle. Kelvin probe measurements give a lower limit for the density of 10(18) cm(-3). The free carrier density after illumination is high enough to explain the formation of quasi-ohmic contacts between ZnO and the polymeric p-type conductor poly(3,4-ethylenedioxythiophene) (PEDOT).
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