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Ultrafast imaging of terahertz electric waveforms using quantum dots

Light(Science & Applications) 2022年第1期11卷 63-68页

作者： Moritz B.Heindl Nicholas Kirkwood Tobias Lauster Julia A.Lang Markus Retsch paul mulvaney Georg Herink Experimental Physics VIII-Ultrafast Dynamics University of BayreuthBayreuthGermany ARC Centre of Excellence in Exciton Science School of ChemistryUniversity of MelbourneMelbourneAustralia Physical Chemistry I University of BayreuthBayreuthGermany

Microscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz(THz)***,only few imaging schemes are able to resolve sub-wavelength fields in the THz range,such as scanning-probe techniques,electro-optic sampling,and ultrafast electron ***,intrinsic constraints on sample geometry,acquisition speed and field strength limit their ***,we harness the quantum-confined Stark-effect to encode ultrafast electric near-fields into colloidal quantum dot *** approach,termed Quantum-probe Field Microscopy(QFIM),combines far-field imaging of visible photons with phase-resolved sampling of electric *** capturing ultrafast movies,we spatio-temporally resolve a Terahertz resonance inside a bowtie antenna and unveil the propagation of a Terahertz waveguide excitation deeply in the sub-wavelength *** demonstrated QFIM approach is compatible with strong-field excitation and sub-micrometer resolution—introducing a direct route towards ultrafast field imaging of complex nanodevices inoperando.

关键词： antenna waveguide quantum

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Self-depleted CuSCN at back contact for high performance CZTSSe solar cells

Self-depleted CuSCN at back contact for high performance CZT...

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第九届新型太阳能材料科学与技术学术研讨会

作者： Yixiong Ji Xiangyun Zhao Fangyang Liu paul mulvaney School of Metallurgy and Environment Central South University ARC Centre of Excellence in Exciton Science School of Chemistry University of Melbourne

Optimization of the back contact interface is crucial for improving the performance of Cu ZnSnS(CZTS) thin film solar cells. In this paper, we employ self-depleted CuSCN as an intermediate layer at the Mo/CZTS interface to improve the quality of the back contact. This CuSCN layer, obtained by aqueous solution processing eliminates multi-layer crystallization of the absorber and suppresses the undesirable reaction between Mo and selenium(Se) during the selenization process. By preventing the reaction of Mo and CZTSSe which triggers the formation of secondary phases, a highly crystalline, single-layer CZTSSe absorber is achieved. The single-layer CZTS absorber exhibits reduced carrier recombination, enhanced carrier density and there is a reduced conduction band offset(CBO) at the CZTSSe/CdS junction. The improved back contact allows a 11.09% powerconversion-efficiency to be achieved.

关键词： Self-depleted CuSCN back contact CZTSSe solar cell

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A reflective display based on the electro-microfluidic assembly of particles within suppressed water-in-oil droplet array

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Light(Science & Applications) 2023年第12期12卷 2742-2754页

作者： Shitao Shen Haoqiang Feng Yueming Deng Shuting Xie Zichuan Yi Mingliang Jin Guofu Zhou paul mulvaney Lingling Shui Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal University510006 GuangzhouChina International Joint Laboratory of Optofluidic Technology and System(LOTS) National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouPeople’s Republic of China School of Electronic Information University of Electronic Science and Technology of ChinaZhongshan Institute528402 ZhongshanChina ARC Centre of Excellence in Exciton Science School of ChemistryUniversity of MelbourneParkvilleVIC 3010Australia

Reflective displays have stimulated considerable interest because of their friendly readability and low energy ***,we develop a reflective display technique via an electro-microfluidic assembly of particles(eMAP)strategy whereby colored particles assemble into annular and planar structures inside a dyed water droplet to create"open"and"closed"states of a display ***-in-oil droplets are compressed within microwells to form a pixel *** particles dispersed in droplets are driven by deformation-strengthened dielectrophoretic force to achieve fast and reversible motion and assemble into multiple *** eMAP based device can display designed information in three primary colors with≥170°viewing angle,~0.14 s switching time,and bistability with an optimized material *** proposed technique demonstrates the basis of a high-performance and energy-saving reflective display,and the display speed and color quality could be further improved by structure and material optimization;exhibiting a potential reflective display technology.

关键词： deformation reflective fluid

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