Tuning exciton recombination rates in doped transition metal dichalcogenides

oleh: Theresa Kuechle, Sebastian Klimmer, Margarita Lapteva, Tarlan Hamzayev, Antony George, Andrey Turchanin, Torsten Fritz, Carsten Ronning, Marco Gruenewald, Giancarlo Soavi

Format: Article
Diterbitkan: Elsevier 2021-12-01

Deskripsi

Monolayer transition metal dichalcogenides (TMDs) are direct gap semiconductors that hold great promise for advanced applications in photonics and optoelectronics. Understanding the interplay between their radiative and non-radiative recombination pathways is thus of crucial importance not only for fundamental studies but also for the design of future nanoscale on-chip devices. Here, we investigate the interplay between doping and exciton–exciton annihilation (EEA) and their impact on the photoluminescence quantum yield in different TMD samples and related heterostructures. We demonstrate that the EEA threshold increases in highly doped samples, where the radiative and non-radiative recombination of trions dominates.