Effect of chemical modification of thin C60 fullerene films on the fundamental absorption edge - N. L. Dmitruk; Yu. Borkovskaya; T. S. Havrylenko; D. O. Naumenko; P. Petrik; V. Meza-Laguna; E. V. Basiuk (Semiconductor Physics, Quantum Electronics and Optoelectronics, 2010)