Physical and Electrochemical Analysis of an Indoor–Outdoor Ageing Test of Large-Area Dye Solar Cell Devices

Authors

  • Simone Mastroianni,

    1. CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
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  • Alessandro Lanuti,

    Corresponding author
    1. CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
    2. Dyepower viale Castro Pretorio 122, 00185 Rome (Italy)
    • CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
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  • Dr. Stefano Penna,

    1. Dyepower viale Castro Pretorio 122, 00185 Rome (Italy)
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  • Dr. Andrea Reale,

    1. CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
    2. Dyepower viale Castro Pretorio 122, 00185 Rome (Italy)
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  • Prof. Thomas M. Brown,

    1. CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
    2. Dyepower viale Castro Pretorio 122, 00185 Rome (Italy)
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  • Prof. Aldo Di Carlo,

    1. CHOSE–Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata viale Politecnico 1, 00133 Rome (Italy)
    2. Dyepower viale Castro Pretorio 122, 00185 Rome (Italy)
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  • Prof. Franco Decker

    1. Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome (Italy)
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Abstract

A long-term life test (3200 h) on large-area dye-sensitized cells is performed both under outdoor conditions, in the sunny Mediterranean climate in Rome (Italy), and under continuous light soaking (1 Sun, 85 °C). Different degradation rates are investigated for the outdoor samples with horizontally and vertically oriented cells (azimuth South, tilt angle 25°). Thirty identical photocells (active area=3.6 cm2, conversion efficiencies=(4.8±0.2) %) are aged using a robust master-plate configuration. After the first 1000 h of testing in open-circuit conditions, some of the test samples are set near the maximum power point (MPP) and the life test continued further until 3200 h. A detailed analysis of the physical parameters obtained by electrochemical impedance is given together with electrolyte transmittance variation with time as a function of the ageing conditions. Faster degradation in devices working at the MPP is observed, due mainly to a progressive decrease of the triiodide concentration in the electrolyte and a likely alteration at the titania/electrolyte interface. Outdoor devices working with vertically oriented cells show clearly that the orientation of long-striped cells can affect the lifetime. The aged cells suffer an increase of recombination rate, change in the chemical capacitance, and positive shift of the titania conduction band level. A strong correlation between the increase of the electrolyte diffusion resistance and degradation phenomena is found.

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