Report Summarizes Quantum Dots Study Findings from University of Pittsburgh (Depleted Bulk Heterojunctions in Thermally Annealed PbS Quantum Dot Solar Cells)
By a News Reporter-Staff News Editor at Energy Weekly News -- Fresh data on Quantum Dots are presented in a new report. According to news reporting out of Pittsburgh, Pennsylvania, by VerticalNews editors, research stated, "We have studied the detailed interface structure and energy conversion behavior of TiO2/PbS heterojunction solar cells. Nanoscale structure and composition analysis have revealed that thermal annealing causes intermixing of the TiO2 and PbS phases and influences the morphologies and optical properties of the heterojunction film."
Our news journalists obtained a quote from the research from the University of Pittsburgh, "This intermixing increased the junction area within the depleted bulk heterojunction (DBH) layer and promoted the carrier extraction from PbS QDs to TiO2. In addition, the thermal annealing caused interparticle necking between PbS QDs and increased the crystallinity of the PbS QD film. Compared with unannealed PbS/TiO2 heterojunction solar cells, the formation of the DBH layer and the partial sintering of PbS QDs led to a doubling of the short-circuit current (J(sc)) and an improved energy conversion efficiency, by 39%. Electric force microscopy analysis confirmed the presence of a DBH layer. The electron lifetime and fill factor (FF) of the solar cells decreased when the TiO2/PbS mixed film was thermally annealed, and this was assigned to a lower recombination resistance in the DBH layer."
According to the news editors, the research concluded: "Post-treatment of PbS/TiO2 DBH films with ethanedithiol was found to increase the recombination resistance at PbS/TiO2 interface and to enhance the energy conversion efficiency to similar to 4%."
For more information on this research see: Depleted Bulk Heterojunctions in Thermally Annealed PbS Quantum Dot Solar Cells. Journal of Physical Chemistry C, 2014;118(27):14749-14758. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)
Our news journalists report that additional information may be obtained by contacting B. Ding, University of Pittsburgh, Dept. of Chem, Pittsburgh, PA 15260, United States. Additional authors for this research include Y. Wang, P.S. Huang, D.H. Waldeck and J.K. Lee.
Keywords for this news article include: Oil & Gas, Pittsburgh, Pennsylvania, Quantum Dots, United States, Nanotechnology, Energy Conversion, Emerging Technologies, North and Central America
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