| 초록 |
Compared with their bulk counterparts, two-dimensional materials can sustain much higher elastic strains (up to ~10%), at which optical quantities such as bandgaps and absorption spectra governing optoelectronic device performance can be modified with relative ease. Here, using first-principles density functional theory calculations, we demonstrate the uniaxial tensile strain significantly enhances the powever conversion efficiency of lateral MoX2/WX2 (X=S, Se, Te) hybrid-based solar cells by almost 50%. In addition, we show that a lateral MoS2/MoTe2 heterostructure uniquely develops a continuously varying direct bandgap across the heterojunction, which is a particularly useful characteristic for broadband absorption across the solar spectrum. We expect the 2D lateral heterostructures to be promising for optimizing optoelectronic device performance by selectively tuning the energetic and spatial distributions of the bandgap. |
