20 research outputs found
Mode of Occupation of Tabun Cave, Mt Carmel, Israel During the Mousterian Period: A Study of the Sediments and Phytoliths
High-Resolution Study of TiO<sub>2</sub> Contact Layer Thickness on the Performance of Over 800 Perovskite Solar Cells
In this Letter, we
systematically explore the influence of TiO<sub>2</sub> thickness
with nanometric variations over a range of 20–600
nm on the photovoltaic parameters (open-circuit voltage, short circuit
current, fill-factor, and power conversion efficiency) of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>-based solar cells. We fabricate several
sample libraries of 13 × 13 solar cells on large substrates with
spatial variations in the thickness of the TiO<sub>2</sub> layers
while maintaining similar properties for the other layers. We show
that the optimal thickness is ∼50 nm for maximum performance;
thinner layers typically resulted in short-circuited cells, whereas
increasing the thickness led to a monotonic decrease in performance.
Furthermore, by assuming a fixed bulk resistivity of TiO<sub>2</sub>, we were able to correlate the TiO<sub>2</sub> thickness to the
series and shunt resistances of the devices and model the variation
in the photovoltaic parameters with thickness using the diode equation
to gain quantitative insights