Abstract
Dye-sensitized solar cell (DSC) technology has been broadly investigated over the past few decades. The sandwich-type structure of the DSC makes the manufacturing undemanding under laboratory conditions but results in the need for reproducible measurements for acceptable DSC characterization. Electrochemical impedance spectroscopy (EIS) offers the possibility to study complex electronic systems and is commonly used for solar cells. There is a tendency in the literature to present impedance data only for one representative device. At the same time, as current density–voltage plots illustrate, measurements can vary within one set of DSCs with identical components. We present multiple DSC impedance measurements on “identical” devices prepared using two different dyes and present a statistical analysis regarding the reproducibility.
Highlights
Over the last few decades, solar cells have become a key technology due to their ability to convert sunlight into electrical energy
Silicon-based solar cells are already established in the marketplace, but their costly and tedious fabrication motivates the examination of alternative systems
The sandwich-type Dye-sensitized solar cell (DSC) structure is easy to manufacture with a broad variety of sensitizers and offers lower-cost devices
Summary
Over the last few decades, solar cells have become a key technology due to their ability to convert sunlight into electrical energy. Silicon-based solar cells are already established in the marketplace, but their costly and tedious fabrication motivates the examination of alternative systems. Dye-sensitized solar cells (DSCs) are a promising solution. The sandwich-type DSC structure is easy to manufacture with a broad variety of sensitizers and offers lower-cost devices. The photoanode typically consists of a fluorine-doped tin oxide (FTO)-coated glass substrate with a layer of a sintered nanoparticulate semiconductor (usually TiO2 in n-type DSCs), onto which a sensitizer is adsorbed. The high scientific interest in DSCs has resulted in the development of techniques for measuring their performance. The most broadly used characterization methods for DSCs are current density–voltage plots (J–V curves), external quantum efficiency (EQE) measurements, and electrochemical impedance spectroscopy (EIS)
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