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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.53: Poster

Donnerstag, 14. März 2013, 17:00–20:00, Poster B2

Modulated charge separation across disordered TiO₂ / In₂S₃ hetero-junctions — •Albert Juma, Anahita Azarpira, Christian-Herbert Fischer, and Thomas Dittrich — Helmholtz-Centre-Berlin for Materials and Energy, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

Charge separation across hetero-junctions between disordered wide gap semiconductors and suitable inorganic absorbers play a decisive role for the development not only of nanocomposite solar cells. Extremely thin coatings of Cl-free and Cl-containing In₂S₃ (In₂S₃:Cl) layers were prepared by spray ion layer gas reaction (ILGAR) on nanoporous TiO₂ (np-TiO₂). Charge separation in FTO/np-TiO₂/In₂S₃:Cl, FTO/In₂S₃:Cl, FTO/np-TiO₂ / In₂S₃ and FTO/In₂S₃ systems has been investigated by modulated surface photovoltage spectroscopy (SPV). The exponential defect tails below the band gap of In₂S₃ were reduced for In₂S₃:Cl. The analysis of the SPV spectra allowed to distinguish different mechanisms of charge separation and to deduce the conduction band offsets (about 0.3 eV and 0.05 eV for np-TiO₂/In₂S₃:Cl and np-TiO₂/In₂S₃, respectively).