Article
Energy & Fuels
Anh Dinh Bui, Md Arafat Mahmud, Naeimeh Mozaffari, Rabin Basnet, The Duong, Gabriel Bartholazzi, Tien T. Le, Thien N. Truong, Mike Tebyetekerwa, Ary Wibowo, Klaus J. Weber, Thomas P. White, Kylie R. Catchpole, Daniel Macdonald, Hieu T. Nguyen
Summary: This study presents a fast imaging technique for predicting the performance of perovskite solar cells, which can be applied to investigate degradation behaviors and predict the performance of perovskite films with different compositions. This technique demonstrates significant value in the research and development of perovskite solar cells.
Article
Energy & Fuels
Christof Schultz, Markus Fenske, Laura-Isabelle Dion-Bertrand, Guillaume Gelinas, Stephane Marcet, Janardan Dagar, Andreas Bartelt, Rutger Schlatmann, Eva Unger, Bert Stegemann
Summary: Absolute calibrated hyperspectral photoluminescence (PL) imaging is used to spatially map relevant solar cell parameters without electrical measurements. The process of laser patterning for monolithic series interconnection is evaluated, and it is found that both picosecond and nanosecond laser pulses can be used successfully. Hyperspectral PL imaging provides insights into the material removal process and the resilience of perovskite against the thermal impact of the laser.
Article
Energy & Fuels
Miha Kikelj, Matevz Bokalic, Marko Topic, Benjamin Lipovsek
Summary: Spatially resolved imaging methods play an important role in the characterization of solar cells, especially when dealing with laterally varying devices. By coupling SRI characterization with advanced simulation, accurate extraction of underlying electrical phenomena can be achieved.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Nanoscience & Nanotechnology
Ziwei Liu, Chen Cai, Wengang Wu, Xinxia Cai, Zhi-mei Qi
Summary: Nanostructured films possess unique electrical, optical, and plasmonic characteristics due to their nano-size effect. In this study, a hyperspectral dark-field microscope (HSDFM) was employed to characterize nanostructured films with high resolution, revealing different optical properties of various samples and showcasing the applicability of HSDFM for thin-film device optimization.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Hui Bao, Cuili Chen, Yongqi Cao, Shuai Chang, Shuangpeng Wang, Haizheng Zhong
Summary: In this study, the charge accumulation and recombination in an operational QLED were quantitatively determined using time-resolved electroluminescence (TREL) spectroscopy. Time-resolved current (TRC) measurement was introduced and simulated using an equivalent circuit model, including a series resistance, a parallel resistance, and a capacitance. The key processes in a typical TREL spectra were modeled, and the stages of delay, rising, and decay were correlated to charge accumulations, charge injection and recombination, and charge release and recombination, respectively. The electroluminescence recombination rate was derived by fitting the rising stage curves in the TREL spectra, providing an intrinsic parameter of the emissive materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Astronomy & Astrophysics
Maosheng He, Joachim Vogt, Eduard Dubinin, Tielong Zhang, Zhaojin Rong
Summary: The study investigates the Venusian solar-wind-induced magnetosphere using unbiased statistical methods with high spatial resolution. Results show that the structures in the magnetosphere exhibit IMF dependence, with the cylindrical magnetic component being more intense in the hemisphere with an upward solar wind electric field. These structures, such as low-ionosphere magnetization and looping structures, are spatially separate and exhibit unique characteristics under different IMF conditions.
ASTROPHYSICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Daniele Capista, Luca Lozzi, Aniello Pelella, Antonio Di Bartolomeo, Filippo Giubileo, Maurizio Passacantando
Summary: Photodetectors based on vertical multi-walled carbon nanotube (MWCNT) film-Si heterojunctions are successfully achieved by growing MWCNTs on n-type Si substrates covered with Si3N4 layers. Spatially resolved photocurrent measurements demonstrate that higher photo detection is achieved in regions with thinner MWCNT film, resulting in nearly 100% external quantum efficiency. Therefore, a simple method utilizing scotch tape is proposed to tune the thickness and density of the as-grown MWCNT film, thereby enhancing the device photo-response.
Article
Nanoscience & Nanotechnology
Tomi K. K. Baikie, James Xiao, Bluebell H. H. Drummond, Neil C. C. Greenham, Akshay Rao
Summary: Luminescent solar concentrators (LSCs) have the potential to improve solar energy capture when coupled to traditional photovoltaics (PV) by concentrating direct and diffuse solar radiation onto a smaller area of PV. However, LSCs suffer from various optical losses that are difficult to quantify with simple power conversion efficiency measurements. In this study, we used spatially resolved photoluminescence quantum efficiency measurements to identify and analyze different loss processes in large-area LSCs, including out-coupling, self-absorption via emitters, and self-absorption from the LSC matrix. These measurements also provided insights into the optimization of optical properties and guided the design of future LSCs for improved solar energy capture.
Article
Energy & Fuels
Cyril Leon, Pierre Saint-Cast, Andreas Fell, Johannes M. Greulich, Stefan Rein
Summary: The robustness of a method called Fourier-transform photoluminescence (FTPL) is investigated to determine the recombination current-density (J0,met) under the front metallization fingers of silicon solar cells. The method uses a voltage-calibrated photoluminescence imaging setup and does not require any dedicated sample preparation. The results show that the FTPL method can differentiate solar cells that have undergone different metallization conditions and provides similar results compared to other characterization techniques.
Article
Optics
Rai Kou, Atsushi Ishizawa, Koki Yoshida, Norisugu Yamamoto, Xuejun Xu, Yugo Kikkawa, Kota Kawashima, Takuma Ihara, Tai Suchizawa, Guangwei Cong, Kenichi Hitachi, Tadashi Nishikawa, Katsuya Oguri, Koji Yamada
Summary: We propose a method to enhance supercontinuum light generation in a precisely dispersion-engineered deuterated SiN waveguide through multimode excitation. By applying spatial position offsets to excite fundamental and higher-order modes, we achieved bandwidth broadening with flatness. The SNR improvement of up to 18 dB at a wavelength of 0.6 μm was attributed to the presence of dispersive waves due to the excitation of TE10 and TE01 modes.
Article
Neurosciences
Faraz Sadrzadeh-Afsharazar, Alexandre Douplik
Summary: This study investigated the use of Non-Invasive Transcranial Alternating Current Stimulation (NITACS) to induce and map phosphenes in healthy individuals. The study identified optimal stimulation parameters for reliable phosphene induction without skin irritation or pain. The findings suggest that NITACS can be a valuable tool for studying the relationship between facial stimulation location and phosphene localization, and raise questions about the origin of phosphenes generated through NITACS.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jared Faisst, Mathias List, Friedemann Heinz, Uli Wuerfel
Summary: This study evaluates the correlation between Delta E-F and electroluminescence (EL) emission through steady-state and transient EL experiments. The results show that the occupation of charge transfer (CT) states is in equilibrium with the free charge carrier densities, indicating the same quasi-Fermi levels (QFL).
ADVANCED OPTICAL MATERIALS
(2022)
Article
Energy & Fuels
Marko Turek, Manuel Meusel
Summary: The quality control in solar cell production is improved by analyzing the correlation between quantitative performance data and imaging diagnostics. A reliable and automated classification of EL-images is achieved using an artificial intelligence approach. The correlation between cell I-V-data and AI-predicted EL-image classes allows for early detection of performance issues.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Physical
Frida H. Roenning, Anirban Roy, Douglas S. Aaron, Matthew M. Mench
Summary: This study investigates mass transport limitations in electrolyzers using spatially-resolved current measurements, revealing non-uniform current distribution caused by restricted liquid water transport. The research also finds that different architectures and porous media affect polarization in different regions of the active area.
JOURNAL OF POWER SOURCES
(2022)
Article
Physics, Applied
Jan Ruschel, Jens W. Tomm, Johannes Glaab, Tim Kolbe, Arne Knauer, Jens Rass, Neysha Lobo-Ploch, Tamukanashe A. Musengezi, Sven Einfeldt
Summary: In this study, InAlGaN-based UVB light-emitting diodes were operated at a high current density and heatsink temperature. The spatial intensity distributions were measured, and it was found that they became less homogeneous with operation time. It was concluded that the current density distribution changes during operation, and the active region degrades more rapidly in areas of higher current density. It is proposed that the decrease in total optical power of the LEDs during operation is due to a decreasing radiative recombination efficiency of the active region.
APPLIED PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Michael Rauer, Christian Schmiga, Annika Raugewitz, Markus Glatthaar, Stefan W. Glunz
PROGRESS IN PHOTOVOLTAICS
(2016)
Article
Energy & Fuels
C. Geisler, W. Hoerdt, S. Kluska, A. Mondon, S. Hopman, M. Glatthaar
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2015)
Article
Energy & Fuels
Achim Kraft, Christian Wolf, Jonas Bartsch, Markus Glatthaar, Stefan Glunz
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2015)
Article
Energy & Fuels
Markus Glatthaar, Ivona Kafedjiska, Gisela Cimiotti, Martin Bivour, Sybille Hopman
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2017)
Article
Energy & Fuels
Andreas Buechler, Sven Kluska, Fabian Meyer, Andreas A. Brand, Gisela Cimiotti, Jonas Bartsch, Markus Glatthaar
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2017)
Article
Energy & Fuels
Markus Glatthaar, Rukmangada Rohit, Andreas Rodofili, Yitzhak J. Snow, Jan Nekarda, Jonas Bartsch
IEEE JOURNAL OF PHOTOVOLTAICS
(2017)
Article
Energy & Fuels
Sven Kluska, Andreas Buechler, Jonas Bartsch, Benjamin Gruebel, Andreas A. Brand, Simon Gutscher, Gisela Cimiotti, Jan Nekarda, Markus Glatthaar
IEEE JOURNAL OF PHOTOVOLTAICS
(2017)
Article
Energy & Fuels
Andreas Buechler, Benjamin Gruebel, Varun Arya, Tobias Weingaertner, Angelika Haehnel, Volker Naumann, Jonas Bartsch, Markus Glatthaar, Sven Kluska
IEEE JOURNAL OF PHOTOVOLTAICS
(2019)
Article
Energy & Fuels
Hassan Merhi, Andreas Fell, Benjamin Gruebel, Markus Glatthaar, Sven Kluska
IEEE JOURNAL OF PHOTOVOLTAICS
(2020)
Article
Energy & Fuels
Benjamin Gruebel, Gisela Cimiotti, Christian Schmiga, Varun Arya, Bernd Steinhauser, Norbert Bay, Michael Passig, Damian Brunner, Markus Glatthaar, Sven Kluska
Summary: The study demonstrates a lead-free metallization approach for bifacial tunneling oxide and passivating contacts (TOPCon) solar cells without the need for an initial metal seed layer, achieved by electroplating Ni/Cu/Ag. The method allows for narrow contact geometries and low contact resistivity, addressing challenges such as direct contacting of silicon and dissolution of contacts. An optimized process sequence resulted in a solar cell efficiency of 22.5% on industrial bifacial TOPCon solar cells, matching the performance of screen-printed reference solar cells.
IEEE JOURNAL OF PHOTOVOLTAICS
(2021)
Article
Energy & Fuels
Thibaud Hatt, Ozde S. Kabakli, Patricia S. C. Schulze, Armin Richter, Stefan W. Glunz, Markus Glatthaar, Jan Christoph Goldschmidt, Jonas Bartsch
Summary: The study demonstrates the electroplating of copper contacts on small-area single-junction perovskite solar cells using an atomic layer deposited Al2O3 masking layer. The successful creation of plated contact fingers and electrical contact between the Cu electrode and the ITO on the perovskite absorber is confirmed. Additionally, the plating process allows for producing well-defined copper contacts on the PSC and tandem solar cells independent of substrate size.
Proceedings Paper
Energy & Fuels
Rukmangada Rohit, Andreas Rodofili, Gisela Cimiotti, Jonas Bartsch, Markus Glatthaar
7TH INTERNATIONAL CONFERENCE ON SILICON PHOTOVOLTAICS, SILICONPV 2017
(2017)
Proceedings Paper
Energy & Fuels
Andreas Buechler, Andreas Beinert, Sven Kluska, Viola Haueisen, Pascal Romer, Friedemann D. Heinz, Markus Glatthaar, Martin C. Schubert
7TH INTERNATIONAL CONFERENCE ON SILICON PHOTOVOLTAICS, SILICONPV 2017
(2017)
Proceedings Paper
Energy & Fuels
Andreas Buechler, Sven Kluska, Jonas Bartsch, Gisela Cimiotti, Andreas A. Brand, Martin C. Schubert, Markus Glatthaar
PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON CRYSTALLINE SILICON PHOTOVOLTAICS (SILICONPV 2016)
(2016)
Proceedings Paper
Energy & Fuels
G. Cimiotti, J. Bartsch, A. Kraft, A. Mondon, M. Glatthaar
PROCEEDINGS OF THE FIFTH WORKSHOP ON METALLIZATION FOR CRYSTALLINE SILICON SOLAR CELLS
(2015)