Design of Novel All Organic Complementary Circuits for Wearable Electronics
Technical Report,30 Mar 2015,29 Mar 2018
BRUNEL UNIVERSITY UXBRIDGE United Kingdom
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In-plane electrical characteristics of non-peripherally octyl C8H17 and hexyl C6H13 substituted liquid crystalline LC double-decker lanthanide bisphthalocyanine LnPc2 compounds with central metal ions lutetium Lu, and gadolinium Gd have been measured in thin film formulations on interdigitated gold Au electrodes for the applied voltage Va range of 0 Va 100 V. The conduction mechanism is found to be Ohmic within the bias of 0 Va 30 V while the bulk limited Poole-Frenkel mechanism is responsible for the higher bias. The compounds show individual characteristics depending on the central metal ions, substituent chain lengths and their mesophases. Values of 67.55 Scm and 42.31 Scm have been obtained. for room temperature in-plane Ohmic conductivity of as-deposited octyl lutetium C8LuPc2 and hexyl gadolinium C6GdPc2 films, respectively while C8GdPc2films exhibit nearly two orders of magnitude smaller conductivity. On annealing at 80C, Ohmic conductivities of C8LuPc2 andC8GdPc2 are found to have increased but the conductivity of C6GdPc decreases by more than one order of magnitude to 1.5Scm. For physical interpretation of the charge transport behavior of these three molecules, their UV-visible optical absorption spectra have been studied in the solution and in as-deposited and annealed solid phases. It is believed that both orientational and positional reorganizations are responsible depending upon the size of the central ion and side chain length.
- Electrical and Electronic Equipment