MIT 2.627 Fundamentals of Photovoltaics, Fall 2011 View the complete course: http://ocw.mit.edu/2-627F11 Instructor: Tonio Buonassisi This lecture describes how semiconductors respond to optical charge excitation, and looks closely at the role of the band gap in determining maximum efficiency. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu/