Tunable relativistic quasiparticle electronic and excitonic behavior of the FAPb(I<sub>1−x</sub>Br<sub>x</sub>)<sub>3</sub> alloy
Zeeshan Muhammad, Peitao Liu, Rashid Ahmad, S. Jalali-Asadabadi, Cesare Franchini, Iftikhar Ahmad
Abstract
and show stronger correlation with the structural changes. The optical property analysis reveals that the overall excitonic peaks are blue shifted with the Br fraction. Our results further reveal strong Br concentration dependence of the variation in the exciton binding energy (from 74 to 112 meV) and the carrier effective masses as well as the high frequency dielectric constants. These findings provide a way to tune the carrier transport properties of the material by doping, which could be utilized to improve the short circuit currents and power conversion efficiencies in multijunction solar cell devices.
Topics & Concepts
QuasiparticleAlloyDopingTandemPhysicsBand gapCondensed matter physicsExcitonMaterials scienceAtomic physicsMetallurgySuperconductivityComposite materialPerovskite Materials and Applications2D Materials and ApplicationsChalcogenide Semiconductor Thin Films