PbS Quatum Dots in Hybrid Inorganic-Organic Tandem Solar Cells.
Mark Speirs a, Claudia Pliego a, Maria Antonietta Loi a, Loredana Protesescu b, Maksym Kovalenko  b
a University of Groningen, Nijenborgh, 4, Groningen, Netherlands
b ETH Zurich, Rämistrasse, 101, Zürich, Switzerland
Poster, Mark Speirs, 029
Publication date: 1st April 2013


Inorganic semiconducting quantum dots (QDs) are a promising class of materials in the field of solution-processable photovoltaics. They possess high absorption coefficients and high mobility compared to organic materials, and exhibit highly tunable optical properties which can be well controlled by varying the crystal size. This makes them prime candidates for use in various device structures including tandem cells, where using materials with complementary absorption ranges is critical to achieving full spectral coverage and current matching between the tandem subcells.

PbS QDs have been reported to yield highly efficient solar cells[1] and recently we have achieved exceptional power conversion efficiencies of 5.2% in Schottky devices. Using this highly efficient material in more sophisticated device structures and in combination with other well established high-performance materials should therefore yield even higher efficiencies. We have reported parallel tandem structures featuring efficiencies as high as 2.9%, harvesting across the entire visible spectrum and in the infrared as far as 1.2 µm.[2]

Solution-processable hybrid inorganic-organic structures such as these are still a very much unexplored, yet promising class of solar cells. In this work we will present our progress in the fabrication of tandem solar cells featuring PbS quantum dots in combination with polymer-fullerene blends, focusing mainly on our latest efforts in developing efficient interlayers for use in serially connected hybrid tandem solar cells

[1] Szendrei, K.; Gomulya, W.; Yarema, M.; Heiss, W.; Loi, M. A., PbS nanocrystal solar cells with high efficiency and fill factor, Appl. Phys. Lett. 97, 203501 (2010); [2] Piliego, C.; Manca, M.; Kroon, R.; Yarema, M.; Szendrei, K.;Andersson, M.R.; Heiss, W.; Loi, M.A. Charge separation dynamics in a narrow band gap polymer–PbS nanocrystal blend for efficient hybrid solar cells, J. Mater. Chem., 2012,22, 24411-24416
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