Figure 5 Light J-V (a) and EQE (b) curves of the champion
MoOx /c-Si(n) SCH solar cell and the reference SHJ solar
cell with the same area of 274.15 cm2.
Stability investigation
Stability tests were performed for the SCH solar cells with two kinds of
rear architectures of c-Si(p)/a-Si:H(i)/MoOx/ICO/Ag and
c-Si(p)/a-Si:H(i)/MoOx/Ag. Both solar cells are not
encapsulated and stored in an air environment with a humidity of
approximately 40% RH. The results are illustrated in Fig. 6. The thin
MoOx film layer (~10 nm) is very
sensitive to environment such as temperature and
atmosphere[34,35]. Thereby, efficiency of the SCH
solar cell with the rear structure of
c-Si(p)/a-Si:H(i)/MoOx/Ag rapidly decays from above
20.12% to 16.89% in 20 days (decays 16%). However, by inserting an
ICO layer between MoOx and Ag, the ICO layer helps to
protect the MoOx film and then the device stability
improves significantly (decays 1.8%).