Solvent-engineered MoS2–Perovskite heterostructures enabling defect passivation and enhanced charge transport
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Abstract
Abstract Solvent engineering provides a route to control both materials chemistry and interfacial properties in perovskite-based devices. In this study, we employ N -methylformamide (NMF) both as a solvent to exfoliate bulk MoS 2 and as a source of the methylammonium cations, through its acidolysis, enabling the in-situ formation of MoS 2 -perovskite heterostructures. The exfoliated MoS 2 remained well-dispersed post-perovskite crystallization, as confirmed by absorbance spectra. Additionally, the presence of MoS 2 resulted in larger perovskite crystals with less strain compared to control samples. The MoS 2 -MAPbBr 3 heterostructure films exhibit approximately 55% photoluminescence quenching, an order of magnitude lower trap density (10 10 cm −3 ), more than two-fold enhancement in the charge carrier mobility (346 cm 2 V −1 s −1 ), and enhanced charge carrier concentration reaching 1.9 × 10 12 cm −3 compared to the control MAPbBr 3 (0.8 × 10 9 cm −3 ). Photodetectors based on MoS 2 -MAPbBr 3 heterostructure and pristine MAPbBr₃ devices are explored. Under 488 nm laser illumination (0.02 mW/cm 2 ), the MoS 2 -MAPbBr 3 device demonstrates responsivity values nearly three times higher than the control devices, along with an external quantum efficiency exceeding 500%. These results highlight the dual role of exfoliated MoS 2 in MAPbBr 3 heterostructure films as an effective passivation and charge carrier transport layer, suppressing trap-assisted recombination and facilitating charge transport.
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Research context
OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Heusler alloys: electronic and magnetic properties
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References (56)
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