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MAPPER Lithography is developing a maskless lithography technology based on massively-parallel electron-beam
writing in combination with high speed optical data transport for switching the electron beams. With 13,000 electron
beams each delivering a current of 13nA on the wafer, a throughput of 10 wph is realized for 22nm node lithography.
By clustering several of these systems together high throughputs can be realized in a small footprint. This enables a
highly cost-competitive alternative to double patterning and EUV.
The most mature and reliable electron source currently available that combines a high brightness, a high emission current
and uniform emission is the dispenser cathode. For this electron source a reduced brightness of 106 A/m2SrV has been measured, with no restrictions on emission current. With this brightness however it is possible to realize a beam current
of 0.3nA (@ 25nm spotsize), which is almost a factor 50 lower than the 13nA that is required for 10 wph.
Three methods can be distinguished to increase the throughput:
1. Use an electron source with a 50× higher brightness
2. Increase the number of beams and lenses 50×
3. Patterned beams: Image multiple sub-beams with each projection lens
MAPPER has selected option 3) 'Patterned beams' as the method to increase the beam current to 13nA. This because an
electron source with a 50x higher brightness is simply not available at this time, and increasing the number of beams and
lenses 50× leads to undesirable engineering issues.
During the past years MAPPER has been developing the concept of 'Patterned beams'. By imaging 7×7 sub-beams per
projection lens the beam current is increased to the required 13nA level. This technique will also be used to maintain
throughput at 10 wph for smaller technology nodes by further increasing the number of sub-beams per projection lens.
In this paper we will describe the electron optical design used to image these multiple sub-beams per lens, as well as
experimental demonstration of this electron optical configuration. Also the writing strategy will be discussed, as well as
the first patterning results. One of the key components for 'Patterned beams' is the beam blanker array, since each subbeam
must be switched on and off individually. The design of the blanker deflectors, the circuitry, as well as experimental results of the blanker array will be shown. Finally the roadmap to further technology nodes will be discussed.
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