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Improved efficiency of hybrid solar cells based on non-ligand-exchanged CdSe quantum dots and poly(3-hexylthiophene)
18.Y. Yuan, F. Riehle, H. Gu, R. Thomann, G. Urban, and M. Krüger, “Critical Parameters for the Scale-Up Synthesis of Quantum Dots,” J. Nanosci. Nanotechnol. (to be published).
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We report on bulk-heterojunction hybrid solar cells based on blends of non-ligand-exchanged CdSequantum 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 CdSeQD based photovoltaic device. After synthesis, the CdSeQDs 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.
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