Figure 3

Photocurrent in various TMDC materials.

(a) Experimental PC spectra of different TMDC devices. All the devices are suspended and annealed except for the multilayer MoS₂ device, which is supported on a glass substrate (Supplementary Information, S1). 1L MoS₂ sample is an annealed device #3. For each device, the bias voltage was chosen to maximize the signal to noise ratio for the photocurrent. Solid bars are calculated excitonic peaks and band gap values. Large spin-orbit coupling of WSe₂ results in splitting of the valence and the conduction bands even near Γ-point, which leads to splitting of the C-peak. (b) Dependence of excitonic peak positions and band gap values on number of layers of MoS₂. (c,d) Comparison of E_g, E_bind and spin-orbit coupling strengths for different 1L-TMDCs.