Organic semiconductors have been studied thoroughly and are well understood, though the effects in which oxygen and humidity have on them are less well known. In this thesis we immerse copper phthalocyanine thin films deposited at two different substrate temperatures and with two different thicknesses to an environment with oxygen pressures from 10 mbar to 210 mbar and water vapor pressures from 5 mbar to 13 mbar. The conductivity of our thin films at atmospheric oxygen and water pressure ranged from as high as 6:7 × 10−4 S/m and as low as 9:6 × 10−5 S/m, about 7 orders of magnitude less than silicon and germanium. At the smallest oxygen doping, the conductivity ranged from as high as 4:9 × 10−5 S/m to as low as 1:1 × 10−5 S/m. We can conclude that the small grain samples are more easily doped by oxygen, the small grain samples have a larger sensitivity gain than the large grain samples, and the intrinsic conductivity increases as both grain size decreases and as film thickness decreases.
|Commitee:||Kwon, Chuhee, Peterson, Michael|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 56/01M(E), Masters Abstracts International|
|Subjects:||Electromagnetics, Condensed matter physics|
|Keywords:||Charge transport, Copper phthalocyanine, Organic semiconductors, Oxygen, Water absorption|
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