Fig. 3: Role of Light for different coatings and salinity levels. | Nature Communications

Fig. 3: Role of Light for different coatings and salinity levels.

From: Enhancing hydrovoltaic power generation through coupled heat and light-driven surface charge dynamics

Fig. 3

a Time trace of the measured open-circuit voltage and capacitance at 1 mM KCl for two devices with different dielectric shells and low N-doping (1–20 Ω.cm). The test was conducted under ambient conditions and 100 mW/cm2 solar illumination (yellow-shaded region). b Measured photovoltage under 100 mW/cm2 intensity for samples with Al2O3 and TiO2 shells (same low N-doped silicon core) at different concentrations of KCl. Error bar represents the standard deviation of three measurements. c Measured open circuit voltage in the dark and the corresponding photovoltage measured as the device is heated and then allowed to cool down. d Steady-state capacitance (blue bars) values for two devices with Al2O3 shell, but with different doping of silicon core (low N-doped: 1–20 Ω.cm and high N-doped: <0.005 Ω.cm) at 1 mM KCl. The blue and red shaded region is measured at a surface temperature of TS = Tambient = 25 °C and TS = 70 °C, respectively.

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