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In this work we investigate the moduli stabilisation problem and therequirements for de Sitter vacua within the framework of type IIB stringtheory. Using perturbative effects arising from the various sources such as$\alpha^\prime$ corrections, logarithmic as well as KK and winding-typestring-loop corrections along with the higher derivative $F^4$-contributions,we present a moduli stabilisation scheme in which the overall volume isrealised at exponentially large values such that $\langle {\cal V} \rangle\simeq e^{a/g_s^2}$ in the weak coupling regime, where $a$ is a parameter givenas $a = \frac{\zeta[3]}{2 \zeta[2]} \simeq 0.365381$. We also present aconcrete global construction using a $K3$-fibred CY threefold with $h^{1,1} =3$which shares many of its properties with those of the standard toroidal case,and subsequently generates the appropriate corrections needed to fix all thethree K\"ahler moduli at the perturbative level. We further discuss whether deSitter vacua can be ensured through appropriate contributions of upliftingterms in the effective potential.

Stabilising all K\"ahler moduli in perturbative LVS