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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - GaAs Grown on Si (111) by inserting metal selenides films
摘要： In this study, the crystalline improvement of GaAs grown on metal (Ga or In) selenides films is studied. We have found that the inevitable bonding between Ga and Se on the top of In2Se3 was observed. Further, the wettability of GaAs nucleus has been improved by irradiating Ga2Se3 surface with As, Ga, and Se simultaneously. The twin-domain less than 2% for 1 μm-GaAs grown on an In2Se3/Si (111)4o off-cut to [11-2] has been achieved by introducing Ga2Se3 on In2Se3 with the subsequent (As-Ga-Se) treatment.
关键词： GaAs/Si,metal selenides,Twin
更新于2025-09-19 17:13:59
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N-doped C/CoSe2@Co–FeSe2 yolk-shell nano polyhedron as superior counter electrode catalyst for high-efficiency Pt-free dye-sensitized solar cell
摘要： Yolk-shell structures based on transition metal chalcogenides (TMCs) have broad application prospects in energy conversion/storage fields. In this work, a facile step-wise synthetic strategy was used to synthesize the yolk-shell structured polyhedrons. The intermediate named as ZIF-67@Co-Fe PBA nanocrystal was formed by the reaction between Co2+ released from ZIF-67 polyhedrons and [Fe(CN)6]3? hydrolyzed from K3[Fe(CN)6]. N-doped carbon/CoSe2@Co-FeSe2 (CoSe2-NC@Co-FeSe2) and N-doped carbon/CoS2@Co-FeS2 (CoS2-NC@Co-FeS2) polyhedrons with yolk-shell structures were prepared by modifying the ZIF-67@Co-Fe PBA nanocrystals in the annealing process and they have been applied in dye-sensitized solar cells (DSSCs). Noteworthily, CoSe2-NC@Co-FeSe2 and CoS2-NC@Co-FeS2 yolk-shell polyhedrons showed high catalytic activity in accelerating the reduction of triiodide in DSSCs because of the distinctive structural characteristics and favorable chemical compositions. The power conversion efficiency (PCE) of 9.61% and 9.18% were obtained by CoSe2-NC@Co-FeSe2 and CoS2-NC@Co-FeS2 based DSSCs, respectively, which were both superior to that of Pt (8.15%). This as-designed approach implies the new perspective to prepare more types of TMCs with yolk-shell structures in multitudinous areas of energy conversion.
关键词： CoSe2-NC@Co-FeSe2,Transition metal selenides,Yolk-shell polyhedrons,CoS2-NC@Co-FeS2,Dye-sensitized solar cells
更新于2025-09-11 14:15:04