CMOS Digital Integrated Circuits Analysis & Design
CMOS Digital Integrated Circuits Analysis & Design
Channel length variation effect on performance parameters of organic field effect transistors
Microelectronics Journal
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This paper explores the possibility of organic-inorganic inverter circuits starting with independent designs of organic thin film transistors. Simulated I---V characteristics of all p/n devices are compared with experimental results that yield an average error of 0.8 % and 4.3 % for threshold voltage and mobility, respectively. Furthermore, static and dynamic responses of different inverters are compared, using CuPc---F16CuPc, pentacene---C60, pentacene---ZnO, pentacene---a-Si:H and pentacene---pentacene as driver and load combinations to address the effect of various materials and configurations. Analytical results for switching threshold and propagation delay have also been provided to validate the circuit simulation. Observations illustrate good balancing between pull up and pull down operation of pentacene with C60, a-Si:H and ZnO due to the comparable mobility of p and n-type transistors. Moreover, pentacene---C60 and all p-organic inverters demonstrate 38 % and 45 % reduction in propagation delay, respectively, even at smaller W/L ratios, as compared to CuPc---F16CuPc combination, due to lower mobilities of CuPc and F16CuPc devices. Although, pentacene---ZnO hybrid combination shows almost 35 % higher propagation delay as compared to a-Si:H, but still it is preferable due to several advantages related to fabrication, such as low process temperature.