ECN publication
Surface photovoltage spectroscopy (SPS) : a useful tool for the detection of charge carrier injection processes in extremely thin absorber (ETA) solar cells
Lenzmann, F.O.; O'Regan, B.C.; Wienke-Ullrich, J.A.; Huisman, C.; Reijnen, L.; Goossens, A.; Ruehle, S.; Cahen, D.
Published by: Publication date:
ECN Solar Energy 1-7-2001
ECN report number: Document type:
ECN-RX--01-046 Conference Paper
Number of pages: Full text:
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Presented at: Nanostructures in PV, Dresden, Germany, 28 juli 2001-4 augustus 2001.

The concept of ETA solar cells is closely related to the concept of dye-sensitized solar cells. In dye-sensitized solar cells the light absorption is achieved by a monolayer of a molecular dye (organic or metalorganic), adsorbed at the surface of a mesoporous n-type semiconductor film (typically TiO2). In ETA solar cells2 the molecular dye is replaced by an extremely thin (approx. 3-10 nm) layer of an inorganic pigment, such as Cu2S or CuInS2 (fig. 1a). The photovoltaic effect in this type of solar cell is due to charge carrier injection from the absorber layer into the contacting n- and p-type layers respectively (fig. 1b) upon excitation by incident photons. These injection processes can be considered as the heart of such type of injection solar cells. The investigation of charge carrier injection for a given interface is therefore crucial. In this contribution, we show that Surface Photovoltage Spectroscopy (SPS) can provide useful information on charge carrier injection at ETA-interfaces.

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