This file was created by the Typo3 extension
sevenpack version 0.7.16
--- Timezone: CET
Creation date: 2023-02-05
Creation time: 01-57-11
--- Number of references
19
article
Insights from Transient Absorption Spectroscopy into Electron Dynamics Along the Ga‐Gradient in Cu(In,Ga)Se2 Solar Cells
Adv. Energy Mater.
2021
11
2003446
https://onlinelibrary.wiley.com/doi/10.1002/aenm.202003446
10.1002/aenm.202003446
Yu-HanChang
RomainCarron
MarioOchoa
CarlotaBozal-Ginesta
Ayodhya N.Tiwari
James R.Durrant
LudmillaSteier
article
Quantitative depth-profile analysis of transition metal nitride materials with combined grazing-incidence X-ray fluorescence and X-ray reflectometry analysis
Spectrochimica Acta Part B: Atomic Spectroscopy
2020
9
1
171
105926
Refractory transition metal nitrides are attracting attention in many microelectronics research and development fields. Their different applications and desired performances require a precise control of the film thickness and elemental depth profile. This information can be non-destructively obtained combining Grazing-Incidence X-ray Fluorescence (GIXRF) and X-ray Reflectometry (XRR) analysis. GIXRF-XRR joint analysis can be performed following a reference-free approach, which requires the knowledge of the whole experimental system. However, such a rigorous metrological approach cannot be easily applied to in-lab or in-fab tools due to the difficulty to access the various experimental set-up parameters, therefore another approach is needed. In this paper, we used a reference-based method consisting in the use of known standard samples, close in composition and structure with respect to the samples to analyse, to deduce the key parameters of the instrumental setup. These are then used to perform quantitative GIXRF-XRR combined analysis of the samples of interest. We applied this method to titanium tungsten nitride thin films elaborated by Physical Vapour Deposition (PVD). Our results show that the reference-based method, using carefully determined instrumental functions, can meet the requirement for both qualitative and quantitative depth-profiling analysis. The reference-based approach result easier to implement into labs and fabs than the reference-free method.
http://www.sciencedirect.com/science/article/pii/S0584854719305920
https://doi.org/10.1016/j.sab.2020.105926
0584-8547
10.1016/j.sab.2020.105926
SimonaTorrengo
DianeEichert
Y.Mazel
M.Bernard
YvesMénesguen
Marie-ChristineLépy
EmmanuelNolot
article
Challenges and opportunities for an efficiency boost of next generation Cu(In,Ga)Se2 solar cells: prospects for a paradigm shift
Energy Environ. Sci.
2020
5
13
13
2047-2055
Cu(In,Ga)Se2 photovoltaic technology has notably progressed over the past years. Power conversion efficiencies above 23% were reached in spite of the polycrystalline nature of the absorber. Although efficiencies are still far from the practical limits, the material quality is approaching that of III–V compounds that yield the most efficient solar cells. The high carrier lifetime, low open circuit voltage deficit and external radiative efficiency in the single-digit percentage range suggest that the next efficiency boost may arise from the implementation of alternative device architectures. In this perspective paper, we describe the current challenges and pathways to enhance the power conversion efficiency of Cu(In,Ga)Se2 solar cells. Specifically, we suggest the use of non-graded absorbers, integration of charge selective contacts and maximization of photon recycling. We examine these concepts by a semi-empirical device modelling approach, and show that these strategies can lead to efficiencies of 29% under the AM1.5 global spectrum. An analysis of whether or not current state-of-the-art Cu(In,Ga)Se2 solar cells already benefit from photon recycling is also presented.
10.1039/D0EE00834F
MarioOchoa
StephanBuecheler
Ayodhya N.Tiwari
RomainCarron
article
Colloidal bimetallic platinum–ruthenium nanoparticles in ordered mesoporous carbon films as highly active electrocatalysts for the hydrogen evolution reaction
Catal. Sci. Technol.
2020
3
4
10
7
2057-2068
Hydrogen features a very high specific energy density and is therefore a promising candidate for clean fuel from renewable resources. Water electrolysis can convert electrical energy into storable and transportable hydrogen gas. Under acidic conditions, platinum is the most active and stable monometallic catalyst for the hydrogen evolution reaction (HER). Yet, platinum is rare and needs to be used efficiently. Here, we report a synthesis concept for colloidal bimetallic platinum–ruthenium and rhodium–ruthenium nanoparticles (PtRuNP, RhRuNP) and their incorporation into ordered mesoporous carbon (OMC) films. The films exhibit high surface area, good electrical conductivity and well-dispersed nanoparticles inside the mesopores. The nanoparticles retain their size, crystallinity and composition during carbonization. In the hydrogen evolution reaction (HER), PtRuNP/OMC catalyst films show up to five times higher activity per Pt than Pt/C/Nafion® and PtRu/C/Nafion® reference catalysts.
https://doi.org/10.1039/C9CY02285F
10.1039/C9CY02285F
RenéSachse
DenisBernsmeier
RomanSchmack
InesHäusler
AndreasHertwig
KatrinKraffert
JörgNissen
RalphKraehnert
article
AlOx Surface Passivation of Black Silicon by Spatial ALD: Stability under Light Soaking and Damp Heat Exposure
Journal of Vacuum Science and Technology A
2020
1
8
38
022401
https://avs.scitation.org/doi/10.1116/1.5133896
10.1116/1.5133896
Ismo T.S.Heikkinen
GeorgeKoutsourakis
SauliVirtanen
MarkoYli-Koski
SebastianWood
VilleVähänissi
EmmaSalmi
Fernando A.Castro
HeleSavin
article
Assessing Optical and Electrical Properties of Highly Active IrOx Catalysts for the Electrochemical Oxygen Evolution Reaction via Spectroscopic Ellipsometry
ACS Catal.
2020
10
23
14210–14223
https://pubs.acs.org/doi/10.1021/acscatal.0c03800
10.1021/acscatal.0c03800
RenéSachse
MikaPflüger
Juan-JesúsVelasco-Vélez
MarioSahre
JörgRadnik
MichaelBernicke
DenisBernsmeier
Vasile-DanHodoroaba
MichaelKrumrey
PeterStrasser
RalphKraehnert
AndreasHertwig
article
ALD-ZnMgO and absorber surface modifications to substitute CdS buffer layers in co-evaporated CIGSe solar cells
EPJ Photovoltaics
2020
11
12
https://www.epj-pv.org/articles/epjpv/full_html/2020/01/pv200013/pv200013.html
10.1051/epjpv/2020010
RamisHertwig
ShiroNishikawa
MarioOchoa
Shih-ChiYang
ThomasFeurer
EvgeniiaGilshtein
Ayodhya N.Tiwari
RomainCarron
proceedings
Stability of the Surface Passivation Properties of Atomic Layer Deposited Aluminum Oxide in Damp Heat Conditions
AIP Conference Proceedings
2019
8
17
2147
050003
https://doi.org/10.1063/1.5123852
10.1063/1.5123852
Ismo T.S.Heikkinen
GeorgeKoutsourakis
SebastianWood
VilleVähänissi
Fernando A.Castro
HeleSavin
article
Analysis of elemental composition and porosity of mesoporous iridium-titanium mixed oxide thin films for energy application by SEM/EDS
Microscopy and Microanalysis
2019
8
25
Supplement S2
1770-1771
10.1017/S1431927619009589
RenéSachse
Vasile-DanHodoroaba
AndreasHertwig
L.Kotil
RalphKraehnert
article
In situ contactless thermal characterisation and imaging of encapsulated photovoltaic devices using phosphor thermometry
Progress in Photovoltaics: Research and Applications
2019
6
11
27
8
673-681
10.1002/pip.3142
YamengCao
GeorgeKoutsourakis
Gavin J. M.Sutton
James W. E.Kneller
SebastianWood
James C.Blakesley
Fernando A.Castro
article
Photon flux determination of a liquid-metal jet X-ray source by means of photon scattering
Journal of Analytical Atomic Spectrometry
2019
5
23
34
7
1497-1502
10.1039/C9JA00127A
MalteWansleben
ClaudiaZech
CorneliaStreeck
JanWeser
ChristophGenzel
BurkhardBeckhoff
RolandMainz
article
Time-resolved photoluminescence on double graded Cu(In,Ga)Se2 – Impact of front surface recombination and its temperature dependence
Science and Technology of Advanced Materials
2019
4
9
20
1
313-323
10.1080/14686996.2019.1586583
Thomas P.Weiss
RomainCarron
Max H.Wolter
JohannesLöckinger
EnricoAvancini
SusanneSiebentritt
StephanBuecheler
Ayodhya N.Tiwari
Bulk and surface recombination properties in thin film semiconductors with different surface treatments from time-resolved photoluminescence measurements
Scientific Reports
2019
3
29
9
5385
10.1038/s41598-019-41716-x
Thomas P.Weiss
BenjaminBissig
ThomasFeurer
RomainCarron
StephanBuecheler
Ayodhya N.Tiwari
article
Nanoscale 3D characterisation of soft organic material using conductive scanning probe tomography
AIP Advances
2019
2
11
9
025105
The 3D nanostructure of organic materials plays a key role in their performance in a broad range of fields, from life sciences to electronics. However, characterising the functionality of their morphologies presents a critical challenge requiring nanometre resolution in 3 dimensions and methods that do not excessively distort the soft matter during measurement. Here we present scanning probe tomography using a commercial Pt-Ir coated tip and controlling the tip loading force to sequentially characterise and remove layers from the surface of a sample. We demonstrate this process on a sample exhibiting a polymer nanowire morphology, which is typically used for organic electronic applications, and present a tomographic reconstruction of the nanoscale charge transport network of the semi-crystalline polymer. Good electrical connectivity in 3D is demonstrated by directly probing the electrical properties of the inter-nanowire charge conduction.
https://doi.org/10.1063/1.5066458
https://doi.org/10.1063/1.5066458
10.1063/1.5066458
1
Ravi ChandraChintala
SebastianWood
James C.Blakesley
PaolaFavia
UmbertoCelano
KristofParedis
WilfriedVandervorst
Fernando A.Castro
article
Defect Annihilation by Preferential Grain Growth during Cu(In,Ga)Se2Co-evaporation
2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC)
2018
11
29
To gain an in-depth understanding of the mechanisms and driving forces responsible for the microstructural changes during the Cu-Se deposition of the three-stage Cu(In,Ga)Se 2 co-evaporation process and its effect on the absorber quality, we have performed a series of in-situ studies as well as complementing ex-situ studies in the recent past. Our studies provide insights into several correlating changes of the structural and physical properties of the absorber layer during Cu-Se deposition or subsequent annealing, such as defect annihilation, stress relaxation, texture changes, and grain growth. In this contribution, we combine these various observations and discuss how they can be explained by a model of abnormal grain growth, driven by differences in the defect densities of neighboring grains.
https://doi.org/10.1109/PVSC.2018.8547783
https://doi.org/10.1109/PVSC.2018.8547783
10.1109/PVSC.2018.8547783
1
RolandMainz
HelenaStange
Christian A.Kaufmann
article
PhysRevLett.121.123202
Role of Radial Charges on the Angular Momentum of Electromagnetic Fields: Spin-3/2 Light
Phys. Rev. Lett.
2018
9
21
121
123202
https://link.aps.org/doi/10.1103/PhysRevLett.121.123202
American Physical Society
10.1103/PhysRevLett.121.123202
O. ElGawhary
T.Van Mechelen
H. P.Urbach
article
WoodPRAppl2018
Assessing the Validity of Transient Photovoltage Measurements and Analysis for Organic Solar Cells
Phys. Rev. Applied
2018
8
24
10
2
024038
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.10.024038
10.1103/PhysRevApplied.10.024038
SebastianWood
James C.Blakesley
Fernando A.Castro
article
BeckhoffU2018
Accurate experimental determination of gallium K- and L3-shell XRF fundamental parameters
Journal of Analytical Atomic Spectrometry
2018
5
7
33
1003-1013
HyMet
https://pubs.rsc.org/en/Content/ArticleLanding/2018/JA/C8JA00046H
https://arxiv.org/abs/1805.02951
10.1039/C8JA00046H
RainerUnterumsberger
PhilippHönicke
Julien L.Colaux
ChrisJeynes
MalteWansleben
MatthiasMüller
BurkhardBeckhoff
article
sachsé_hertwig_kraehnert_hodoroaba_2018
Analysis of Mesoporous Iridium Oxide Thin Films by the Combined Methodical Approach SEM/EDS/STRATAGem
Microscopy and Microanalysis
2018
24
S1
762–763
Cambridge University Press
10.1017/S1431927618004300
RenéSachse
AndreasHertwig
RalphKraehnert
Vasile-DanHodoroaba