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• W2009149747 abstract "Theoretical expressions are derived for both the forward current-induced voltage decay (FCVD) and the photovoltage decay (PVD) in a base-dominated back-surface field (BSF) solar cell of arbitrary thickness. The expressions apply to the general case where the effective surface recombination velocity S at the edge of the low-high junction in the base can have any value. If the value of S is taken as infinity, the expressions become applicable to conventional cells with finite base thicknesses. The case of an effective BSF cell in which S = 0 and that of a conventional cell in which S = ∞ are considered in detail. Large errors were found to occur in the values of minority carrier lifetimes τB when lifetimes in the bases of thin conventional cells were determined by the FCVD method using the formula obtained previously; this formula applies only to thick cells. The difference between the FCVD and the PVD is large for W = ∞ (W = w/LB where w is the width of the base and LB is the diffusion length), as shown in previous papers by other workers. As W decreases, the FCVD and the PVD plots become linear, approach each other and are almost identical for W ⩽ 0.5, both for S = 0 and for S = ∞. For S = 0, however, the decay becomes slower as W decreases and the reciprocal of the slope of the FCVD or the PVD plot is equal to the minority carrier lifetime in the base. In contrast, for S = ∞ the voltage decay rate increases rapidly as W decreases, i.e. the FCVD and the PVD plots become steeper; the reciprocal of the slope then becomes equal to τB/(1 + π2/4W2). For small W the advantage of using PVD rather than FCVD for the determination of τB disappears. The PVD in both effective BSF and conventional cells after light pulses of very short duration, and of arbitrary duration, is also discussed. It is shown that in a thick base solar cell the PVD after short pulse excitation can conveniently be used to determine the minority carrier lifetime, even if the pulse is of arbitrary duration, provided that 1/α (where α is the absorption coefficient) is larger than LB. However, if the base is thin (W ⩽ 0.5), the FCVD, the PVD and the PVD after short pulse excitation become almost identical. The method by which the lifetime and the effective surface recombination velocity S can be determined from the observed PVD or FCVD is also discussed for the general case when S is not zero." @default.
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• W2009149747 date "1982-07-01" @default.
• W2009149747 modified "2023-09-22" @default.
• W2009149747 title "Determination of the minority carrier lifetime in the base of a back-surface field solar cell by forward current-induced voltage decay and photovoltage decay methods" @default.
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• W2009149747 doi "https://doi.org/10.1016/0379-6787(82)90064-3" @default.
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