Effective diffusion lengths (formulas)

As sketched in Figure 3.2 on p. 56, a quantum efficiency spectrum of a crystalline thin-film cell shows, in general, two linear regions if plotted as IQE~La ). Both regions define an effective diffusion length:

• The length Lq that we call the quantum efficiency diffusion length and that we derive from the IQE spectrum measured with strongly absorbed light {La « Wbas). The defi­nition of Lq is given on p. 55.

• The length Lc that we call the collection diffusion length and that we derive from the IQE spectrum measured with weakly absorbed light (La » Wbas). The definition of Lc is given on p. 56.

We give the formulas for both effective diffusion lengths Lq and Lc in monocrystalline and polycrystalline material.

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