Figure 3
From: Tandem-structured, hot electron based photovoltaic cell with double Schottky barriers
(a) Plot of photocurrent density as a function of TiO2 layer thickness under light illumination. Cross-sectional SEM images of (b) a 44 nm thick TiO2 layer, (c) a 63 nm thick TiO2 layer and (d) a 81 nm thick TiO2 layer.
