Efficiency of a-Si :H solar cell. Detailed theory - Yu. V. Kryuchenko; A. V. Sachenko; A. V. Bobyl; V. P. Kostylyov; P. N. Romanets; I. O. Sokolovskyi; A. I. Shkrebtii; E. I. Terukov (Semiconductor Physics, Quantum Electronics and Optoelectronics, 2012)