8.+Design+of+Crystalline+Silicon+Solar+Cells+_2008_

8.+Design+of+Crystalline+Silicon+Solar+Cells+_2008_ -...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Design of Silicon Solar Cells MATSCI 302 April 16, 2008 Sources of the figures in this lecture Jenny Nelson, The Physics of Solar Cells Martin Green, Solar Cells
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Design of a basic silicon solar cell Nelson, p. 187, 189
Background image of page 2
How thick should the wafer be? The probability of a photogenerated minority carrier reaching the depletion region is e -x/L , where x is the distance from the depletion region. There isn’t much point in making a wafer thicker than several diffusion lengths. The other important length scale is the absorption depth, 1/α.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
α determines where the light is absorbed Near the band edge, not all of the light is absorbed and some minority carriers are lost due to back surface recombination. At h ν =3.5 eV, the light is absorbed right at the surface. E(eV) 1/α(μm) 1.25 100 2.5 1 3.5 0.01 Nelson p. 182 transmission = e - α x Absorption depth in Si
Background image of page 4
Surface texturing One way to use thin wafers (to save money) is to use surface texturing to scatter light so that it travels more horizontally though the cell.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/01/2011 for the course MS&E 302 taught by Professor Mcghee during the Spring '08 term at Stanford.

Page1 / 13

8.+Design+of+Crystalline+Silicon+Solar+Cells+_2008_ -...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online