AMADEus Seminar - Pr. J.V. Yakhmi - Monday 13 June 2016 - 2:00 pm IMS (Amphi J.P. DOM)

We describe efforts made by our group at BARC to fabricate molecular electronic devices from semiconductor films prepared from porphyrin-based molecules or metal-phthalocyanines (M-Pc). After characterizing these films and fabricating device-structures such as diodes or FETs from them, we look for positive features like dielectric behavior, diode action, hysteresis, switching, negative differential resistance (NDR), memory effect, and resonant tunneling, etc. in transport measurements (I-V curves).

Essentially, this talk will touch upon our attempts to: (i) look for short alkyl chains consisting of ? bonds alone to fabricate a self-assembled monolayer (SAM) which acts as a dielectric layer with reduced thickness; (ii) design new organic molecules for growing electroactive semiconducting layers, viz.  ??? molecules which show memory effect and diode action; or,  ????? molecules, monolayers of which exhibit NDR;  (iii) adopt new strategies to anchor organic conducting molecules on Si, such as electrografting; or electrografting alongwith self-assembly; and (iv) employ different growth methods, as suitable, for high quality organic semiconductor films, viz. organic-MBE to grow high mobility thin films; air-liquid interface to grow free-standing polymer films; or, SAM-modified Si-substrate for self-organization of conducting layers.