http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hong, Dajung,Yim, Sanggyu American Chemical Society 2018 Langmuir Vol.34 No.14
<P>Two-dimensionally (2D) arrayed polystyrene (PS)/ruthenium oxide (RuO<SUB>2</SUB>) core/shell nanospheres are successfully prepared by the electrodeposition of RuO<SUB>2</SUB> nanoparticles on a hexagonal close-packed PS monolayer. This nanosphere structure is entirely different from the structure previously reported for other transition metal oxides electrodeposited on the PS nanosphere arrays. The different growth behavior is analyzed, and a possible deposition mechanism is proposed based on the morphological evolution and photoelectron spectroscopy measurements. As an electrode for supercapacitors, this 2D arrayed nanosphere structure exhibits superior capacitive properties such as significantly large areal capacitance, tight binding with current collectors, and retarded saturation of the capacitance, compared to a planar RuO<SUB>2</SUB> film electrode.</P> [FIG OMISSION]</BR>
Park, Dasom,Yim, Sanggyu Elsevier 2020 Solar energy materials and solar cells Vol.208 No.-
<P><B>Abstract</B></P> <P>Efficient energy band alignment of heterojunction layers in colloidal quantum dot (CQD)-based solar cells is a crucial factor to govern the charge transport characteristics and device performance. In this work, we develop novel cascaded-junctions of lead sulfide (PbS) CQD triple layers consisting of an alkylammonium iodide (AMI)-treated PbS bilayer and a 1,3-propanedithiol (PDT)-treated single layer. The two AMIs, <I>i.e.</I> triethylamine hydroiodide (tri-EAHI) and tetraethylammonium iodide (TEAI), are less hindered and have superior passivation performance compared to tetrabutylammonium iodide (TBAI), the most commonly used AMI. In addition, the band positions of the PbS-TEAI and PbS-tri-EAHI layers are deeper by 0.26 and 0.46 eV, respectively, than those of the PbS-PDT layer, and hence the sequential stacking of these three layers enable an effective cascaded band alignment. The various benefits of the improved band alignment such as increased built-in potential, reduced trap states, widened depletion region, enhanced charge transport and suppressed charge recombination lead to a significant improvement in the device parameters, and the best power conversion efficiency of 10.46% is obtained for the cascaded PbS-tri-EAHI/PbS-TEAI/PbS-PDT-based device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cascaded-junctions of PbS CQD layers was obtained using three different ligands. </LI> <LI> Efficient band alignment improved charge transport and suppressed recombination. </LI> <LI> A power conversion efficiency reached 10.46% for the cascaded-junction solar cell. </LI> </UL> </P>