  This article represents the author's PhD thesis. It describes moduli
stabilisation in IIB string theory and applications to phenomenological topics.
The first half of the thesis starts with an introductory review. It continues
with an account of the statistics of complex structure moduli stabilisation
before moving to Kahler moduli stabilisation. It describes in detail the
large-volumes models and justifies the assumptions used in their construction.
The second half of the thesis is concerned with applications to
phenomenological topics. These include supersymmetry breaking and soft terms,
inflationary model building and axions.
