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Improved efficiency of hybrid solar cells based on non-ligand-exchanged CdSe quantum dots and poly(3-hexylthiophene)

: Zhou, Y.; Riehle, F.S.; Yuan, Y.; Schleiermacher, H.-F.; Niggemann, M.; Urban, G.A.; Krüger, M.


Applied Physics Letters 96 (2010), No.1, Art. 013304, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer ISE ()
Solarthermie und Optik; Farbstoff; Organische und Neuartige Solarzellen; Alternative Photovoltaik-Technologien; Photonenmanagement; Farbstoff und Organische Solarzellen

We report on bulk-heterojunction hybrid solar cells based on blends of non-ligand-exchanged CdSe quantum dots (QDs) and the conjugated polymer poly(3-hexylthiophene) with improved power conversion efficiencies of about 2% under AM1.5G illumination after spectral mismatch correction. This is the highest reported value for a spherical CdSe QD based photovoltaic device. After synthesis, the CdSe QDs are treated by a simple and fast acid-assisted washing procedure, which has been identified as a crucial factor in enhancing the device performance. A simple model of a reduced ligand sphere is proposed explaining the power conversion efficiency improvement.