Studies from Chung Ang University Yield New Information about Nanosheets (The use of UV/ozone-treated MoS2 nanosheets for extended air stability in organic photovoltaic cells)
By a News Reporter-Staff News Editor at Electronics Newsweekly -- Investigators publish new report on Nanosheets. According to news reporting from Seoul, South Korea, by VerticalNews journalists, research stated, "MoS2 nanosheets obtained through a simple sonication exfoliation method are employed as a hole-extraction layer (HEL) to improve the efficiency and air stability of organic photovoltaic cells (OPVs). The reduction in the wavenumber difference, appearance of a UV-vis peak, and atomic force microscopy images indicate that MoS2 nanosheets are formed through the sonication method."
The news correspondents obtained a quote from the research from Chung Ang University, "The OPVs with MoS2 layers show a degraded performance with a power conversion efficiency (PCE) of 1.08%, which is lower than that of OPVs without HEL (1.84%). After performing the UV/ozone (UVO) treatment of the MoS2 surface for 15 min, the PCE value increases to 2.44%. Synchrotron radiation photoelectron spectroscopy data show that the work function of MoS2 increases from 4.6 to 4.9 eV upon UVO treatment, suggesting that the increase in the PCE value is caused by the bandgap alignment. Upon inserting poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) between MoS2 and the active layer, the PCE value of the OPV increases to 2.81%, which is comparable with that of the device employing only PEDOT:PSS. Furthermore, the stability of the OPVs is improved significantly when MoS2/PEDOT:PSS layers are used as the HEL."
According to the news reporters, the research concluded: "Therefore, it is considered that the use of UVO-treated MoS2 may improve the stability of OPV cells without degrading the device performance."
For more information on this research see: The use of UV/ozone-treated MoS2 nanosheets for extended air stability in organic photovoltaic cells. Physical Chemistry Chemical Physics, 2014;16(26):13123-8. (Royal Society of Chemistry - www.rsc.org/; Physical Chemistry Chemical Physics - pubs.rsc.org/en/journals/journalissues/cp)
Our news journalists report that additional information may be obtained by contacting Q.V. Le, School of Chemical Engineering and Materials Science, Chung-Ang University, 221, Heukseok-dong, Dongjak-gu, Seoul 156-756, South Korea. Additional authors for this research include T.P. Nguyen, H.W. Jang and S.Y Kim.
Keywords for this news article include: Seoul, South Korea, Asia, Electronics, Emerging Technologies, Nanosheets, Nanotechnology, Photovoltaic.
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