All-Vacuum-Deposited Bifacial Cu₂ZnSnSe₄ Photovoltaic Cells with Sputtered Cd-Free Buffer Layer

Figure 8

(a) J–V curves without illumination and with AM1.5G (front incident light) for the 1-cycle specimen and 4-cycle specimen, (b) J–V curves of the 4-cycle specimen under different modes of incident light, and (c) spectral irradiance converted from EQE data of charge carriers under front and rear incident light.

(a)

(b)

(c)

(d)