Modulation of optical and electrical characteristics by laterally stretching DNAs on CVD-grown monolayers of MoS₂

Monolayer MoS₂ (1L-MoS₂) is an ideal platform to examine and manipulate two dimensionally confined exciton complexes, which provides a large variety of modulating the optical and electrical properties of 1L-MoS₂. Extensive studies of external doping and hybridization exhibit the possibilities of engineering the optical and electrical performance of 1L-MoS₂. However, biomodifications of 1L-MoS₂ and the characterization and applications of such hybrid structures are rarely reported. In this paper, we present a bio-MoS₂ hybrid structure fabricated by laterally stretching strands of DNAs on CVD-grown 1L-MoS₂. We observed a strong modification of photoluminescence and Raman spectra with reduced PL intensity and red-shift of PL peak and Raman peaks, which were attributed to electron doping by the DNAs and the presence of tensile strain in 1L-MoS₂. Moreover, we observed a significant enhancement of electric mobility in the DNA/1L-MoS₂ hybrid compared to that in the pristine 1L-MoS₂, which may have been caused by the induced strain in 1L-MoS₂.