Apparatus comprising an electrostatic wafer cassette

Radiant energy – Irradiation of objects or material – Irradiation of semiconductor devices

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2504401, 2504531, 361234, H01V 3720

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active

050737163

ABSTRACT:
Disclosed is apparatus comprising an electrostatic cassette assembly for securing a semiconductor wafer during lithographic processing such as direct-write particle-beam lithography. The cassette assembly comprises a cassette body and an electrostatic chuck installable in, and removeable from, the cassette body. The electrostatic chuck comprises a charge plate having a thin dielectric layer on its upper surface, against which the wafer is flattened by Coulombic force. Charge storage means are included for maintaining an electrical potential difference between the wafer and the charge plate even in the absence of connection to a source of electrical energy external to the assembly.

REFERENCES:
patent: 4412133 (1983-10-01), Eckes et al.
patent: 4480284 (1984-10-01), Tojo et al.
patent: 4502094 (1985-02-01), Lewin et al.
Wardly, Review of Scientific Instruments, vol. 44, No. 10, Oct. 1973, pp. 1506-1509.

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