Hello, can any body explain about the evaporation of 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP). In organic and perovskite solar cell , BCP is thermally evaporated. We tried by W boat but it wasn't successful. it evaporated suddenly then we decreased the current but we didn't have any deposition(evaporation). any comment?!thanks in advance