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The Study of Electrical Properties and Photocurrent of Polyaniline/ fluorescein films. | ||
| JOURNAL OF THI-QAR SCIENCE | ||
| Article 1, Volume 1, Issue 4, 2009, Pages 72-82 | ||
| Author | ||
| Hameed A. Hamadi | ||
| Abstract | ||
| Electrical conductivity and visible photo current (PC) measurements have been performed on thick film (10 μm) of polyaniline modified with (1x10-4mole) content of fluorescein organic dye were all measurements have been made using Sandwich structure of aluminum and semitransparent aluminum with area (0.03 cm2) circular electrode. The D.C. conductivity was measured as a function of doping ratio with iodine using the technique of two probes.All current measurements have been made at steady state conditions were the obtained results showed that the domain conduction mechanisms was identified as space charge limited current (SCLC) and the D.C. bulk conductivity of pure films was 6.6x10-9 S.cm-1,and this conductivity is increased by 5.4 times of films with doping ratio equal to 2% . Photocurrent (PC) was measured with specified wave length as a function of applied voltage were the intensity of the incident light was 295 lux/m2 for each case. The obtained results of PC showed that the observed photons form excites, and the caste films have poor photoconductivity while maximum peak of D.C. conductivity under illumination was obtained near Yellow region of visible light were the absorption of incident light is high and free carriers are available. Also the obtained results showed that the cut-off wave length is near red region, and the recombination process is bulk finally Another noticeable remark, that the photocurrent is increased by amount of 800 times & D.C conductivity is increased by 1300 comapred to magnitude at darkness. | ||
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