Inkjet Printhead Integrated Circuit Comprising A Multilayered Substrate

An inkjet printhead integrated circuit comprising a multilayered substrate having drive circuitry and a plurality of nozzle arrangements, each nozzle arrangement comprising:

• a floor;
• a roof spaced apart from the floor, said roof having an ink ejection port defined therein, said roof defining part of a nozzle plate for the printhead integrated circuit;
• sidewalls extending between said roof and said floor so as to define a nozzle chamber, said nozzle chamber having an ink inlet defined therein;
• and
• at least one heater element suspended in the chamber and connected to said drive circuitry in the multilayered substrate, so that when actuation energy is supplied to said heater element from said drive circuitry, a vapour bubble is formed in ink contained in the nozzle chamber resulting in ejection of ink via the ink ejection port.