Abstract
Light soaking characterization on complete SnO2:F/TiO2/In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au, eta solar cell structure as well as on devices which do not include one or both TiO2 and/or PEDOT:PSS layers has been conducted. Additionally, studies of SnO2:F/In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au solar cell have been performed. The power conversion efficiency and the short circuit current density have been found to increase with light soaking duration by a factor of about 1.6 - 2.7 and 2.1 - 3, respectively. The increase in these two parameters has been attributed to the filling up of trap states and/or charge-discharge of deep levels found in In(OH)xSy. These effects take place at almost fill factor and open circuit voltage being unaffected by the light soaking effects.
Highlights
Thin absorber solar cell is a photovoltaic device proposed a few years ago [1,2] and is modeled on dye sensitized solar cell concept [3,4]
We report on light soaking technique as one of the method for improving the conversion efficiency of the eta solar cell and other devices, by prolonged light exposure
Different solar cell structures were produced by coating thin films via various techniques with the following procedures being followed for a full solar cell structure of the type SnO2:F/TiO2/ In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au: A 2 μm thick titanium dioxide, TiO2, thin film was coated by sol-gel technique at SgLux GmbH company using tetra-isopropyl orthotitanate (Ti(C3H6OH)4) mixed with commercial grade solution of isopropanol (CH3CH(OH)CH3) as precursors
Summary
Thin absorber (eta) solar cell is a photovoltaic device proposed a few years ago [1,2] and is modeled on dye sensitized solar cell concept [3,4]. The photovoltaic effect of this type of device is due to charge carrier injection from the sensitizer material. Since the eta concept inception, the conversion efficiency of this type of device has remained very low. A number of techniques have been proposed over the years towards improvement of the solar cell characteristics of this type of device. We report on light soaking technique as one of the method for improving the conversion efficiency of the eta solar cell and other devices, by prolonged light exposure
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