Published online by Cambridge University Press: 26 February 2011
Elementary amorphous silicon logic integrated circuits have been manufactured on glass substrates by rf glow discharge. Circuits presented include two different inverters, a 6-transistor addressable static memory cell, a 3-transistor addressable dynamic memory cell, and a 9-stage ring oscillator. All of the circuits use n-channel enhancement type load TFTs instead of ohmic resistors. The channel length of the driver transistors is 10 μn and 15 μm, experimental geometry ratios range from β=5 to β=33 The influence of the geometry ratio on static and dynamic characteristics is examined. Circuits operating at supply voltages of less than 5 V have been demonstrated.