Patent ID: 8193568

Claim:
A memory cell comprising: a first charge-trapping plane, the first charge-trapping plane comprising two different types of nanoparticles that differ in work function relative to one another, the two types of nanoparticles of the first charge-trapping plane being about the same in average maximum cross-sectional dimension as one another and being a first type of nanoparticles and a second type of nanoparticles; a second charge-trapping plane over the first charge-trapping plane, the second charge-trapping plane comprising a third type of nanoparticles that have a third average maximum cross-sectional dimension; and a third charge-trapping plane over the second charge-trapping plane, the third charge-trapping plane comprising a fourth type of nanoparticles that have a fourth average maximum cross-sectional dimension, the fourth average maximum cross-sectional dimension being at least about 10% greater than the third average maximum cross-sectional dimension.