![]() ![]() One surface has a high recombination and the other has a low recombination so S 1 = 0 and S 2 = ∞ ![]() One surface is perfectly passivated so S 2 = 0.īoth surfaces are perfectly passivated so S 1 = S 2 = 0.īoth surface have high recombination so S 1 and S 2 are large. The surfaces are identical so S = S 1 = S 2. There is a list of approximate solutions for several important cases below: $$ S = \sqrt\right]$$įor quasi-steady-state measurements, the formulas are accurate if. The more exact expression 2 3in transient measurements that works in all cases is: The simplified formulas given below can be used for transient measurements when the effective lifetime is much greater than the transient surface lifetime ( ). The precise solution is quite complicated but approximate solutions exist for special cases and are sufficiently accurate for most purposes 1. τ s is a function of the surface recombination velocities S 1 and S 2, the cell width W and the minority carrier diffusivity D. Recombination at the surfaces is typically described by a surface lifetime τ s, which includes the fundamental decay mode but ignores higher decay modes. Typically the surfaces complicate the measurement of the bulk lifetime. The surface also plays an important role in recombination. ![]()
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