Fig. 3: Absorption enhancement through optimizing band nesting.

a Schematic diagram of absorption enhancement strategies; layer twisting and inserting a buffer layer between the top and bottom layers. Green, yellow, and black spheres indicate molybdenum, sulfur, and carbon atoms. Theoretically calculated absorbances and experimentally measured optical contrast of (b, c) twisted 2L MoS₂ and (d, e) 2L MoS₂ with an intermediate buffer layer. b–e We also show spectra of 1L and 2L MoS₂ shown as dashed black and red lines, respectively. c The inset shows the angle-dependent optical contrast of twisted 2L MoS₂ near the 30° twisted angle.