Effect of Oxygen and Hydrogen on the Thermal Quenching and Thermally-Assisted Optical Quenching of Photocurrents in Evaporated Thin Films of β-Copperphthalocyanine
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The effect of oxygen and hydrogen on thermal quenching and thermally-assisted optical quenching of photocurrents in evaporated thin films of β-copperphthalocyanine has been investigated in the spectral region from the near ultraviolet to the near infrared as a function of temperature. Thermal quenching and optical quenching were observed in an oxygen atmosphere under near ultraviolet and visible excitations, and their onset temperatures were slightly higher than those under an ultra-high vacuum. Hydrogen, however, inhibits the thermal quenching and thermally-assisted optical quenching; no thermal quenching was observed in any region investigated, and only slight optical quenching occurred at high temperatures under the excitation of near ultraviolet light. This effect can be ascribed to the fact that hydrogen, adsorbed tenaciously on the surface, still acts as a dissociator of excitons without being desorbed even at high temperatures and under intense illumination.
- 社団法人応用物理学会の論文
- 1981-11-05
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