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Enhanced UV stability of perovskite solar cells with a SrO interlayer
Lee, Sang-Won,Kim, Seongtak,Bae, Soohyun,Cho, Kyungjin,Chung, Taewon,Hwang, Jae-Keun,Song, Inseol,Lee, Wonkyu,Park, Sungeun,Jung, Jaebong,Chun, Jihun,Lee, Yoon Jung,Moon, Yeon Ji,Lee, Hae-Seok,Kim, Do Elsevier 2018 Organic Electronics Vol.63 No.-
<P><B>Abstract</B></P> <P>We investigated strontium oxide (SrO) as an interlayer material to enhance the UV stability of a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cell. Moisture and over 400 nm wavelength of light were excluded to investigate the effect of UV light only. Two different interlayer fabrication processes were examined to optimize the performance of this solar cell. Devices fabricated by dipping for 30 min in SrO solution exhibited photoconversion efficiencies of 15.5%, whereas those fabricated with 60-min dipping showed photoconversion efficiencies of 15% and exhibited local Sr agglomeration. Devices with SrO displayed lower initial efficiencies than those without any SrO layer (17.6%), However, a device without SrO retained only 34.4% of its initial efficiency after 100 h of UV exposure. In contrast, SrO-incorporated devices retained almost 60.0% of their initial efficiency. Severe μ-PL mapping intensity degradation was observed in devices that did not include the interlayer, but no degradation was observed in those with the SrO interlayer. This can be attributed to the passivation of the degradation sites by SrO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Perovskite UV stability was tested under conditions except moisture, oxygen and wavelengths exceeding 400 nm. </LI> <LI> With high resolution μ-PL mapping technique, direct evidence is provided about the area perovskite UV degradation begins. </LI> <LI> UV degradation is initiated at the ETL/perovskite interface. </LI> <LI> Effect of the SrO interlayer on UV stability was examined in an inert atmosphere. </LI> <LI> UV stability is enhanced by SrO interface passivation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Sangkyu,Cho, Jongyun,Lee, Yeolho,Jeon, Sangmin,Cha, Hyung Joon,Moon, Wonkyu Hindawi Limited 2012 Journal of sensors Vol.2012 No.-
<P>Hepatitis B surface antigen (HBsAg) concentrations were measured using a piezoelectric microcantilever sensor (PEMS) developed by the authors. The developed PEMS is label-free and detects the sensing signal electrically. It was designed to measure the mass of biomolecules attached to it using an accurate mass-microbalancing technique; its probe area is confined to the end of the cantilever, and its equivalent spring constant is relatively high to minimize the effect of changes in the surface stress when the biomolecules are attached to it. The “dip- and-dry” technique was used to enable the probe area of the sensor to react with reagents in controlled environmental conditions. HBsAg was detected by an immunoreaction whereas the reaction time, antibody density, and its area on the probe were kept at a constant level. The mass of the detected HBsAg was measured in the range of 0.1–100 ng/mL.</P>