Evaporation of black holes in string theory

This thesis's project studies how black hole evaporation is captured in string theory by so called Quantum Extremal Islands, extremal surfaces that allows to compute the entanglement entropy of Hawking radiation. This project focus on specific 10d type IIB string theory uplifts of the largely studied 5d Karch-Randall models, doubly-holographic models which allows to study the evaporation of an AdS black hole by coupling it to an external bath via transparent boundary conditions. The main results of recent works on these uplifts will be reproduced and the corresponding Hartman-Maldacena surfaces will be constructed and studied in one of these uplifts, as well as their implications for the Page curve in presence of a non-vanishing dilaton variation.