Solar Cell Device Physics, 2nd Edition

APPENDIX F

Determining p(x) and n(x) for the Space-charge-neutral Regions of a Homojunction

Figure F.1 An n–p homojunction cell under illumination. The quasi-Fermi levels are measured as depicted. Their variations with position are shown exaggerated. The actual variation is dictated by Jn = enμn dEFn/dx and Jp = −epμp dEFp/dx. The minus sign in the second expression is necessary since EFp is being measured as shown in the figure.

In Section 4.4.1 of Chapter 4, the hole density p as a function of x is needed for the top quasi-neutral region and the electron density n as a function of x is needed for the bottom quasi-neutral region. These regions ...