Publication date: 1st July 2014
At the present state of Dye Solar Cells literature, Electroluminescence (EL) was only investigated on lab scale devices with the purpose to study ageing effects. EL is here systematically applied to study the origin of signal emission through spectral and time resolved analyses and for detecting spatial variations on DSCs. The analyses on DSCs are further improved with Light Beam Induced Current (LBIC) measurements and absorbance imaging (Figure 1). We scaled up this technique from a 2.5 cm2 cell to a 10 x 10 cm2 module and to a 25 x 25 cm2 section of a 6000 cm2 glass frit sealed module. We present a detailed analysis showing the effects caused by I3- diffusion limitations through time resolved studies and spatial differences on EL maps attributed to non-uniformity of dye coverage and to different electron-electrolyte recombination rates at the photoelectrode.
More fundamental investigations by EL and photoluminescence (PL) are also performed on Perovskite Solar Cells (PSCs) devices to follow charge transport and recombination processes which we assume to be a direct measure for the perovskite crystal grow, its morphology and the electronic properties of the contacting layers as function of solution processed device fabrication. Our results from investigations on 0.2cm2 perovskite (CH3NH3PbI3) solar cells shows that PL in particular is sensitive to the bulk excitons in the absorber layer, whereas EL (as in organic LEDs) is most sensitive to electron and hole injection rates at the contact layers and to the diffusion limitation of the charges in the absorber layer. First EL and PL maps are also shown for complete PSCs (Figure 2) together with LBIC and SEM images.
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