Interplay between microstructure, defect states, and mobile charge generation in transition metal dichalcogenide heterojunctions

Nanoscale ◽  
2021 ◽  
Author(s):  
Dana B. Sulas-Kern ◽  
Hanyu Zhang ◽  
Zhaodong Li ◽  
Jeffrey L. Blackburn
Keyword(s):  
Transition Metal ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Transition Metal Dichalcogenide ◽  
Mobile Charge ◽  
Defect States ◽  
Charge Generation

We use microwave photoconductivity and transient absorption spectroscopy to show higher yields of mobile carriers and longer lifetimes in nanotube/MoS2 heterojunctions when monolayer MoS2 contains a small fraction of defect-rich multilayer islands.

scholarly journals Carrier relaxation dynamics in defect states of epitaxial GaN/AlN/Si using ultrafast transient absorption spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 83969-83975 ◽  
Author(s):  
Palak Dugar ◽  
Mahesh Kumar ◽  
Shibin Krishna T. C. ◽  
Neha Aggarwal ◽  
Govind Gupta
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Relaxation Dynamics ◽  
Defect States ◽  
Carrier Relaxation ◽  
Ultrafast Transient Absorption ◽  
Defect Levels ◽  
Carrier Relaxation Dynamics ◽  
Ultrafast Transient Absorption Spectroscopy

Carrier relaxation dynamics through the defect levels in an epitaxial GaN/AlN/Si have been analysed on the femto–picosecond timescale, using ultrafast-transient absorption spectroscopy.

scholarly journals Charge generation mechanism tuned via film morphology in small molecule bulk-heterojunction photovoltaic materials

2020 ◽  
Vol 8 (43) ◽  
pp. 15234-15252
Author(s):  
Sylvia J. Lou ◽  
Stephen Loser ◽  
Kyle A. Luck ◽  
Nanjia Zhou ◽  
Matthew J. Leonardi ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Small Molecule ◽  
Transient Absorption ◽  
Bulk Heterojunction ◽  
Transient Absorption Spectroscopy ◽  
Film Morphology ◽  
Charge Generation ◽  
Ultrafast Optical ◽  
Photovoltaic Materials ◽  
Optical Transient

Exciton evolution with PC61BM loading in small molecule BHJ layers revealed by GIWAXS and ultrafast optical transient absorption spectroscopy.

scholarly journals Polymer thin films as universal substrates for extreme ultraviolet absorption spectroscopy of molecular transition metal complexes

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Yusef Shari'ati ◽  
Josh Vura-Weis
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Polymer Surface ◽  
Transient Absorption Spectroscopy ◽  
Molecular Transition

Polystyrene and polyvinyl chloride thin films are explored as sample supports for extreme ultraviolet (XUV) spectroscopy of molecular transition metal complexes. Thin polymer films prepared by slip-coating are flat and smooth, and transmit much more XUV light than silicon nitride windows. Analytes can be directly cast onto the polymer surface or co-deposited within it. The M-edge XANES spectra (40–90 eV) of eight archetypal transition metal complexes (M = Mn, Fe, Co, Ni) are presented to demonstrate the versatility of this method. The films are suitable for pump/probe transient absorption spectroscopy, as shown by the excited-state spectra of Fe(bpy)3 2+ in two different polymer supports.

Charge-Transfer Dynamics at Ag/Ni-MOF/Cu2O heterostructure in Photoelectrochemical NH3 production

2021 ◽  
Author(s):  
Ying Liu ◽  
Jianmin Lu ◽  
Qianxiao Zhang ◽  
Yajie Bai ◽  
Xuliang Pang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Yield Rate ◽  
Ultrafast Transient Absorption ◽  
Charge Transfer Dynamics ◽  
Ultrafast Transient Absorption Spectroscopy

Decoration of Ag-ultrathin Ni-MOF onside Cu2O was firstly fabricated. The charge-transfer dynamics at heterostructure was in-depth revealed by ultrafast transient absorption spectroscopy. NH3 yield rate (4.63 μg h-1 cm-2) with...

Sign in / Sign up

Export Citation Format

Share Document