Black diamond, namely a surface textured diamond film able to absorb efficiently the sunlight, is developed by the use of ultrashort pulse laser treatments. With the aim of fabricating a 2D periodic surface structure, a double-step texturing process is implemented and compared to the single-step one, able to induce the formation of 1D periodic structures. Although the obtained sub-microstructure does not show a regular 2D periodicity, a solar absorptance of about 98% is achieved as well as a quantum efficiency enhanced of one order of magnitude with respect to the 1D periodic surface texturing.
Bellucci, A., Calvani, P., Girolami, M., Orlando, S., Polini, R., & Trucchi, D. M. (2016). Optimization of black diamond films for solar energy conversion. Applied Surface Science, 380, 8–11. https://doi.org/10.1016/j.apsusc.2016.02.107