Exploring Charge and Spin Transfer effect in Novel Organic Semiconductors

Bhattacharyya, Rajarshi (2015) Exploring Charge and Spin Transfer effect in Novel Organic Semiconductors. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Rajarshi Bhattacharyya (10MS22)) MS_thesis_Rajarshi_Bhattacharyya__10MS22.pdf - Submitted Version Restricted to Repository staff only Download (492kB)

Abstract

Conductance properties of an organic semiconductor (MnPly) along with a charge donor metal (Copper) has been studied by means of sequential bilayer deposition. Physical vapour deposition technique has been used for all the thin-film depositions carried out to perform the experiments. In-situ resistance monitoring has been applied to investigate the resistance properties of the thin bilayer film during growth. Both resistivity decrease and increase has been observed in two different regime, depending on the thicknes of the underlayer MnPly thin film. The phenomenon of resistivity decrease and increase are attributed to charge transfer and surface scattering. Amount of charge transfer by means of number of electrons transferred through each molecule of MnPly has been calculated. Scattering cross-section for the surface scattering phenomenon has been calculated and a 105 order of magnitude higher value than that of fullerene has been obtained. This signifies the enormous charge transfer from the metal to the organic molecules which lead to a scattering potential in the thick film regime.

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