Patent ID: 8257506

Claim:
A liquid-treatment unit for treating a substrate, comprising a dispenser, having an input port and an output port and which is configured to dispense a treatment liquid received at the input port onto a substrate; a control valve, coupled in a liquid-communication path between a source of the treatment liquid and the output port of the dispenser, and which is adapted to open or shut the liquid-communication path according to valve-control signals received at a control input port of the control valve; and a control unit, connected to the control valve, and which is adapted to set, in dependence on an evaporation rate of the treatment liquid on the substrate at a given or desired temperature of the substrate or at a given or desired pressure of a gaseous ambient atmosphere at the substrate, a number of dispense pulses to be applied to the substrate for the liquid treatment, a respective pulse duration of individual dispense pulses, and respective dispense-interruption time spans between the individual dispense pulses, and generate and provide a sequence of valve-control signals to the control valve for opening and shutting the liquid communication path according to a dispense-pulse sequence with the set number of dispense pulses, the set respective dispense-pulse durations, and the set respective dispense-interruption time spans between individual dispense pulses.