News Column

Reports from Beijing National Laboratory of Condensed Matter Physics Add New Data to Findings in Quantum Dots

June 13, 2014

By a News Reporter-Staff News Editor at Science Letter -- A new study on Quantum Dots is now available. According to news reporting originating in Beijing, People's Republic of China, by NewsRx journalists, research stated, "Recently, negative signals are frequently observed during the measuring process of monochromatic incident photon-to-electron conversion efficiency (IPCE) for sensitized solar cells by DC method. This phenomenon is confusing and hindering the reasonable evaluation of solar cells."

The news reporters obtained a quote from the research from the Beijing National Laboratory of Condensed Matter Physics, "Here, cause of negative IPCE values is studied by taking quantum dot-sensitized solar cell (QDSC) as an example, and the accurate measurement method to avoid the negative value is suggested. The negative background signals of QDSC without illumination are found the direct cause of the negative IPCE values by DC method. Ambient noise, significant capacitance characteristics, and uncontrolled electrochemical reaction all can lead to the negative background signals. When the photocurrent response of device under monochromatic light illumination is relatively weak, the actual photocurrent signals will be covered by the negative background signals and the resulting IPCE values will appear negative."

According to the news reporters, the research concluded: "To improve the signal-to-noise ratio, quasi-AC method is proposed for IPCE measurement of solar cells with weak photocurrent response based on the idea of replacing the absolute values by the relative values."

For more information on this research see: Study on negative incident photon-to-electron conversion efficiency of quantum dot-sensitized solar cells. Review of Scientific Instruments, 2014;85(2):1139-1144. Review of Scientific Instruments can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics -; Review of Scientific Instruments -

Our news correspondents report that additional information may be obtained by contacting C.H. Li, Chinese Academy Sci, Beijing Key Lab New Energy Mat & Devices, Key Lab Renewable Energy, Beijing Natl Lab Condensed Matter PhysInst Phys, Beijing 100190, People's Republic of China. Additional authors for this research include H.J. Wu, L.F. Zhu, J.Y. Xiao, Y.H. Luo, D.M. Li and Q.B. Meng (see also Quantum Dots).

Keywords for this news article include: Asia, Beijing, Quantum Dots, Nanotechnology, Emerging Technologies, People's Republic of China

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Source: Science Letter

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