where heat management in confined areas is a major issue . Thus, Geh( ) was cast onto a SiO2coated Si surface with a 50x50 micropillars array (100 µm diameter and 100 µm height pillars within a 100 mm 2 area). For that, 250 µL of a 4mg/mL Geh( ) dispersion in water/isopropanol (1:1 ratio) were casted onto the texturized substrate, forming a stable droplet. The droplet was left to evaporate (about 30min) within a fume hood with constant air flow, producing a 1mg film (~10 µm thickness).