Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
The surge for higher efficiency mesoscopic CH3NH3PbI3 perovskite solar cells calls for a better understanding of the properties of the TiO2/perovskite interface as well as of the bulk conductivity of perovskite itself. For this purpose, we developed a new fully inorganic and chemically inert mesoscopic scaffold made of TiO2, Al2O3 and Sn:In2O3 in which the perovskite is infiltrated and precipitated out of solution. The resulting hole-transporter free devices yield up to 8.5% PCE, though the performance is mostly limited by the sheet resistivity of the ITO layer. We show that applying a transparent collector grid on top of the ITO improves the series resistance and further boost its efficiency. This very simple architecture allows a simplification of the various electronic processes taking place in the device.
On mechanically pressed perovskite pellets, we determined the electronic and ionic conductivities by Wagner polarization, as long with the identification of the principal mobile ionic carriers. We show unusually high diffusion coefficient of the ionic component, from which we deduce that most of the electronic carriers are trapped by ionic defects. Additionally, we show that ionic motion can be fully suppressed using gas-phase stoichiometric control, which in turns fully cancels the hysteresis in the j-V measurement of the pellets. On mesoscopic devices, we used small-perturbation transient spectroscopy to demonstrate the effect of forward voltage onto the photo-generated capacitance. The C-V plot shows unusual capacitance behavior that could be related to the stoichiometric polarization within the space-charge region. The defect concentration is indeed significantly affected by the external iodine partial pressure, which in turns affects significantly the trapping density and the capacitance-voltage behavior.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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