Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Electroluminescence (EL) and photoluminescence (PL) imaging are valuable and fast inspection tools for PV technologies to unveil the reason for reduced performance by locating cell defects and non-homogeneous areas with power loss.
At the present state of DSC literature, 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 Dye Solar Cells (DSCs) and Perovskite Solar Cells (PSCs).
The analyses on DSCs are further improved with Light Beam Induced Current (LBIC) measurements and absorbance imaging (Figure 1A). 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 PL are also performed on PSC 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. First EL maps are also shown for complete PSC (Figure 1B).
Figure 1(A). (a) Photo of a complete 2.5 cm2 DSC fabricated with a non-homogeneous dye flushing process (see bottom-right corner). (b) LBIC map measured at 530 nm. (c) Electroluminescence imaging acquired with a bias voltage of 0.8V. Figure 1(B). (a) Photo of a complete PSC and (b) the correspondent electroluminescence image acquired with a bias voltage of 1.2V.
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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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