This video is part of the FREE online course PV1x Photovoltaic Energy Conversion, developed by Delft University of Technology. PV1x is part of the Solar Energy Engineering MicroMasters program.In this video, we will discuss the basic solar cell design. We will look at the individual layers of a solar cell, and discuss the role each layer plays in a photovoltaic device. Furthermore, we will introduce the overview of all the loss mechanisms that occur in solar cells, which we will use throughout this course. Finally, we will use this overview to derive the solar cell design rules.