Generation of Free Carriers in MoSe2 Monolayers Via Energy Transfer from CsPbBr3 Nanocrystals. Issue 14 (16th June 2022)

• Record Type: Journal Article
• Authors: Asaithambi, Aswin; Kazemi Tofighi, Nastaran; Curreli, Nicola; De Franco, Manuela; Patra, Aniket; Petrini, Nicolò; Baranov, Dmitry; Manna, Liberato; Stasio, Francesco Di; Kriegel, Ilka
• Is Part Of: Advanced optical materials. Volume 10:Issue 14(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-16
• Subjects: energy transfer -- excitons -- free carrier generation -- perovskite nanocrystals -- transition metal dichalcogenides -- trions; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200638
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Transition metal dichalcogenide (TMDCs) monolayers make an excellent component in optoelectronic devices such as photodetectors and phototransistors. Selenide‐based TMDCs, specifically molybdenum diselenide (MoSe2 ) monolayers with low defect densities, show much faster photoresponses compared to their sulfide counterpart. However, the typically low absorption of the atomically thin MoSe2 monolayer and high exciton binding energy limit the photogeneration of charge carriers. Yet, integration of light‐harvesting materials with TMDCs can produce increased photocurrents via energy transfer. In this article, it is demonstrated that the interaction of cesium lead bromide (CsPbBr3 ) nanocrystals with MoSe2 monolayers results into an energy transfer efficiency of over 86%, as ascertained from the quenching and decay dynamics of the CsPbBr3 nanocrystals emission. Notably, the increase in the MoSe2 monolayer emission in the heterostructure accounts only for 33% of the transferred energy. It is found that part of the excess energy generates directly free carriers in the MoSe2 monolayer, as a result of the transfer of energy into the exciton continuum. The efficiency of the heterostructure via enhanced photocurrents with respect to the single material unit is proven. These results demonstrate a viable route to overcome the high exciton binding energy typical for TMDCs, as such having an impact on optoelectronic processes that rely on efficient exciton dissociation. Abstract : The energy transfer from CsPbBr3 nanocrystals to the exciton continuum of MoSe2 monolayers results into the direct formation of free carriers with only a fraction recombining radiatively. Avoiding the formation and subsequent dissociation of excitons with high binding energies in this material will open up novel design strategies for 2D transition metal dichalcogenide‐based optoelectronic devices by exploiting the direct generation of free carriers by energy transfer.