Fig. 4
From: Black phosphorus ink formulation for inkjet printing of optoelectronics and photonics
Characterisation of printed BP. a Optical extinction (at 550 nm for printed BP with 1–10 printing repetitions, inset—photograph of printed BP squares (8 mm × 8 mm). b Spatial linear (α l) and nonsaturable (α ns) optical absorption (at 1562 nm) across printed BP, spatial step 0.5 mm. c Raman map of the intensity ratio, I \(\left( {A_{\rm{g}}^1} \right)\)/I \(\left( {A_{\rm{g}}^2} \right)\), for BP printed onto Si/SiO2 with 1 μm spatial step. The grey squares correspond to regions where the Raman intensity is too low for accurate interpretation; d Corresponding histogram of the map in c. e Change in optical extinction (at 550 nm) for encapsulated and unencapsulated printed BP across 30 days under ambient conditions
