1 research outputs found
Kesterite Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> Solar Cells with beyond 8% Efficiency by a Sol–Gel and Selenization Process
A facile
sol–gel and selenization process has been demonstrated
to fabricate high-quality single-phase earth abundant kesterite Cu<sub>2</sub>ZnSnÂ(S,Se)<sub>4</sub> (CZTSSe) photovoltaic absorbers. The
structure and band gap of the fabricated CZTSSe can be readily tuned
by varying the [S]/([S] + [Se]) ratios via selenization condition
control. The effects of [S]/([S] + [Se]) ratio on device performance
have been presented. The best device shows 8.25% total area efficiency
without antireflection coating. Low fill factor is the main limitation
for the current device efficiency compared to record efficiency device
due to high series resistance and interface recombination. By improving
film uniformity, eliminating voids, and reducing the MoÂ(S,Se)<sub>2</sub> interfacial layer, a further boost of the device efficiency
is expected, enabling the proposed process for fabricating one of
the most promising candidates for kesterite solar cells