Study on the properties of solar cell under bias condition by using impedance spectroscopy

Abstract

This paper investigates the properties of silicon cells (SI) and perovskite solar cells (PSC) under bias condition by using impedance spectroscopy. The parallel resistances R_p of SI and PSC are found to decrease with increasing bias, but the capacitance C_p shows the opposite trend. Comparing R_p with C_p, bias has a greater impact on the C_p of both cells. However, the bias has little effect on the series resistance R_s of both cells. Compared with SI cell, the bias is seen to be a greater impact on the R_p and a smaller impact on C_p of PSC. The carrier lifetime τ_n in SI and PSC first increases and then decreases with bias, and the carrier diffusion length L_d increases almost linearly with bias. Compared to SI cell, the bias has a greater impact on PSC’s L_d.

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