Phase transitions and critical behaviour -- Re?onant raman scattering in semiconductors -- Phonons in layer structures -- Polymeric sulfur nitride, (SN)x—A new type of a one-dimensional metal? -- Configurations of 4f electrons in rare earth compounds -- Optical and electronic properties of III–VII compounds—Thallous halides -- Atomic defects in metals and semiconductors -- Characterization and elimination of defects in silicon -- Material engineering in optoelectronics -- Electron-beam lithography—A viable solution? -- Hopping conductivity in disordered solids -- New dynamic aspects of amorphous dielectric solids -- Solar cells and their terrestrial applications -- Large scale solar energy utilization the use of thin film solar cells.