R. Brendel et U. Rau, Effective diffusion lengths for minority carriers in solar cells as determined from internal quantum efficiency analysis, J APPL PHYS, 85(7), 1999, pp. 3634-3637
We introduce a general relationship between the effective diffusion length
L-Q of solar cells derived from spectral quantum efficiency Q and the effec
tive diffusion length L-J that determines the saturation current j(0)=qn(0)
D/L-J of the diode in the dark. The general relation L(Q)greater than or eq
ual to L-J holds in the presence of grain boundaries and of spatially nonho
mogeneous doping profiles. We find the relation L-Q=L-J for solar cells wit
hout potential fluctuations at the collecting junction. (C) 1999 American I
nstitute of Physics. [S0021-8979(99)01707-7].