Figure10 (a) The light I-V curves and (b) EQE spectra of the SHJ solar
cells with IHfO:H (Cell 1) or ITO (Cell 2) as the front-side TCO under
optimal conditions.
Finally, a bifacial SHJ solar cell with an area of 274.15
cm2 was fabricated using IHfO:H film deposited with a
H2 concentration of 0.8 % as the front-side TCO (Cell
Ⅰ). And a control bifacial SHJ cell with ITO on both sides (Cell Ⅱ) was
also assembled as a comparison. Post annealing was carried out in air
under a temperature of 200 °C for 20 minutes for the whole devices. The
light I-V and EQE curves of Cell Ⅰ and Cell Ⅱ are shown in Figure 10.
The two solar cells do not show significant differences in open circuit
voltage (Voc) or FF. The improvement of 0.3 % in
efficiency (Eff) for Cell Ⅰ (25.03 %) compared with Cell II (24.73 %)
is mainly brought by the increase of 0.84 mA/cm2 in
Jsc. The significant increase in EQE in the long
wavelength range (>850 nm) indicates reduced FCA for Cell I
using IHfO:H compared with Cell I using ITO as the front-side TCO layer.
The excellent device performance indicates that the IHfO:H films
prepared by RPD have the great application potential in high efficiency
SHJ solar cells.