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  Physics Express 2014, 4: 19
  Research Article
Studies on the photoswitching property of vinylferrocene-doped poly(methyl methacrylate) thin films
  Manik Kumar Sanyal, Bipul Biswas, Manisree Majumder, Aloke Kumar Chakraborty#, Avijit Chowdhury, Biswanath Mallik  
Department of Spectroscopy, Indian Association for the Cultivation of Science, 2A & 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata-700 032, India
# Present Address: Department of Computer Science and Engineering, BGC Trust University, Chandanaish, Chittagong, Bangladesh

  Electrical dark and photo conductivity of vinylferrocene (abbreviated as VFc) doped poly(methylmethacrylate) (abbreviated as PMMA) thin films have been studied in vacuum by using surface type sample cells. VFc doped PMMA thin films were prepared from solution in chloroform. The changes in current have been studied upon photoexcitation (white light) and after turning it off as a function of illumination of light of various intensities (mercury lamp 125 W) and sample cell temperatures. The rise and decay of current have been measured and interesting photoswitching behavior of current in vacuum has been noticed. Photoinduced enhancement in current followed by a quenching in photocurrent during photoexcitation was noticed. The results have been discussed on the basis of formation of photoinduced charge-transfer complexes of VFc with chloroform molecules confined in the PMMA thin films, secondary thermal reaction, creation of photoinduced charge carriers, trapping and detrapping of charge carriers, etc.
  Vinylferrocene; PMMA; Photoswitching; Charge-transfer  

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