Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physics of Fully Depleted CCDs   In this work we present simple, physics-based models for two effects that
have been noted in the fully depleted CCDs that are presently used in the Dark
Energy Survey Camera. The first effect is the observation that the point-spread
function increases slightly with the signal level. This is explained by
considering the effect on charge-carrier diffusion due to the reduction in the
magnitude of the channel potential as collected signal charge acts to partially
neutralize the fixed charge in the depleted channel. The resulting reduced
voltage drop across the carrier drift region decreases the vertical electric
field and increases the carrier transit time. The second effect is the
observation of low-level, concentric ring patterns seen in uniformly
illuminated images. This effect is shown to be most likely due to lateral
deflection of charge during the transit of the photogenerated carriers to the
potential wells as a result of lateral electric fields. The lateral fields are
a result of space charge in the fully depleted substrates arising from
resistivity variations inherent to the growth of the high-resistivity silicon
used to fabricate the CCDs.

30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom