Efficient photoluminescence enhancement and tunable photocarrier transfer in vertical 2D organic–inorganic heterostructure by energy funneling

Abstract

Abstract Two-dimensional (2D) transition metal dichalcogenides (TMDCs) are attractive for their novel physical properties. However, the photoluminescence (PL) quantum yield of TMDCs has been limited, due to their abundant defects and strong many-body effect. Here, we present a vertical energy funneling channel which is constructed in organic–inorganic heterostructures comprising MoSe2, pentacene and graphene oxide. These heterostructures show efficient PL enhancement (3.7 times) ratio of monolayer MoSe2. Besides, the PL signal is further increased as high as 4.7 times at low temperature due to reduced electron-phonon interactions and also sensitive to the gradient magnetic field. Apart from the efficient PL enhancement, the photocarrier pumping efficiency which is modulated by energy offset of top layer and external field is >130 times greater than that in isolated MoSe2. These findings focused on manipulating the efficient photocarrier transfer open up a new route to adjust the luminescent properties of monolayer TMDCs for designing future 2D material based optoelectronic devices.