Article
Physics, Applied
Tomohisa Mizuno, Takashi Aoki, Toshiyuki Sameshima
Summary: The experimental study investigates the influence of Si surface orientation on the formation and photoluminescence properties of SiC dots. The results show that the diameter and surface density of SiC dots depend on Si surface orientation, and the photoluminescence intensity of SiC dots is strongly influenced by Si surface orientation and Si atom surface density.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Energy & Fuels
Anelise Medeiros Pires, Marilia Braga, Ricardo Ruther
Summary: The performance of three ground-mounted fixed-tilt photovoltaic systems in Florianopolis, Brazil was analyzed, with results showing that the CdTe with ARC PV system performed the best. Environmental parameters such as temperature and spectral content of sunlight were found to have the highest impacts on PV system performance.
PROGRESS IN PHOTOVOLTAICS
(2021)
Article
Multidisciplinary Sciences
Zheng Li, Jin Xue, Marc de Cea, Jaehwan Kim, Hao Nong, Daniel Chong, Khee Yong Lim, Elgin Quek, Rajeev J. Ram
Summary: In this letter, an electrically driven Si light-emitting diode with a sub-wavelength emission area is reported. It has a high spatial intensity of >50 mW/cm² and exhibits a high degree of spatial coherence due to sub-wavelength confinement. This on-chip light source can be used in integrated photonics systems.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Dongke Li, Jiaming Chen, Zhaoguo Xue, Teng Sun, Junnan Han, Wanghua Chen, Etienne Talbot, Remi Demoulin, Wei Li, Jun Xu, Kunji Chen
Summary: Understanding the distribution and behavior of dopants in silicon nanocrystals is crucial for achieving controllable doping at the nanoscale and developing next-generation optoelectronic devices. This study investigates the atomic-scale distributions of phosphorus and boron dopants in silicon nanocrystal multilayers. The results show that phosphorus dopants mainly concentrate on the surfaces of silicon nanocrystals to passivate dangling bonds and provide free electrons, while boron dopants exhibit a different distribution pattern, forming a dopant-shell covering on the surfaces of silicon nanocrystals and leading to damage in the crystalline lattice.
APPLIED SURFACE SCIENCE
(2023)
Article
Optics
Dongke Li, Jiaming Chen, Teng Sun, Yangyi Zhang, Jun Xu, Wei Li, Kunji Chen
Summary: Phosphorus/boron co-doping in Si quantum dots/SiO2 multilayers enhances subband light emission, with increasing B co-doping ratio resulting in improved emission intensity nearly two orders of magnitude stronger than solely P-doped samples. This enhancement is attributed to B dopants passivating surface dangling bonds, leading to suppressed phosphorus-related deep level emission and appearance of emission centered around 1400 nm in high B co-doping ratios.
Article
Chemistry, Applied
Yan Sun, Chen Li, Xiaowei Feng, Chuanfeng Wang, Ning Wang, Junru Zhu, Ting Wang, Xiaoyan Cui
Summary: Silicon substituted coumarins SiC-Azs show high sensitivity and selectivity for monitoring cellular hydrogen sulfide, with rapid equilibrium achieved. The probe SiC-Az2 is highly sensitive for detecting endogenous and exogenous hydrogen sulfide in Hela cells and zebrafish.
Article
Chemistry, Physical
Rabin Basnet, Manjula Siriwardhana, Hieu T. Nguyen, Daniel Macdonald
Summary: Ring defects in n-type silicon wafers grown by the Czochralski method can significantly affect solar cell efficiency, emitting broad defect-related luminescence peak. This study shows that manipulating excitation laser power can achieve consistent injection levels for quantitative comparisons. Additionally, the effects of hydrogenation and phosphorus diffusion gettering on individual deconvoluted peaks of the DRL spectrum were investigated.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Joel Davidsson, Rohit Babar, Danial Shafizadeh, Ivan G. Ivanov, Viktor Ivady, Rickard Armiento, Igor A. Abrikosov
Summary: In this study, a defect database generated by automatic defect analysis and qualification (ADAQ) workflows is used to identify and analyze defects in 4H-SiC that contribute to previously unidentified magneto-optical signals. A carbon anti-site structure near the silicon vacancy is identified as the cause of these signals, and its energetic boundness is determined. Computational and experimental results show good agreement, demonstrating the effectiveness of using a high-throughput database for defect search in quantum applications.
Article
Chemistry, Analytical
Masanori Sakamoto, Ken-ichi Saitow
Summary: Silicon is considered a promising enhancement material due to its abundance, low toxicity, and high refractive index. A cost-effective and efficient fabrication method for a field enhancement substrate consisting of a two-dimensional Si wire array (2D-SiWA) was reported, demonstrating high sensor sensitivity and reproducibility. The large-area Si fluorescence sensor fabrication proved to be 50x less expensive, 20x faster, and 60,000x larger than the typical electron beam lithography method.
ANALYTICAL CHEMISTRY
(2022)
Article
Physics, Applied
Zechen Hu, Dehang Lin, Xuegong Yu, Christoph Seiffert, Andrej Kuznetsov, Deren Yang
Summary: The study found significant correlations between the formation/dissociation of metal precipitates and the appearance of electronic states during LeTID evolution, as well as the co-localization of iron re-precipitation with copper atom agglomerations. This sheds light on potential mechanisms that enhance metal redistributions in mc-Si during LeTID.
APPLIED PHYSICS EXPRESS
(2021)
Article
Multidisciplinary Sciences
Matteo Stocchi, Zhibo Cao, Christopher Hardly Joseph, Thomas Voss, Davide Mencarelli, Luca Pierantoni, Canan Baristiran Kaynak, Joachim Hebeler, Thomas Zwick, Matthias Wietstruck, Mehmet Kaynak
Summary: This paper presents a MM-loaded sub-THz on-chip antenna with a narrow beamwidth, 9 dB gain, and a simulated peak efficiency of 76% at 300 GHz. The antenna is surrounded by a single MM-cell ring to suppress surface waves. Comparisons between the measured and simulated performances show excellent agreement, indicating that the MM-loaded antenna is a viable alternative for next-generation sub-THz transceivers.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Bhanu Pratap Dhamaniya, Kartiki Chandratre, Priyanka Chhillar, Amit Kumar, Krishna Priya Ganesan, Sandeep Kumar Pathak
Summary: This study demonstrates a method to improve luminescence homogeneity and fluorescence density in perovskite films by controlling the concentration of Pb(NO3)(2) in PbI2/di-methylformamide solution and using an optimized precursor mix solution. Analysis of spatial variation in photoluminescence shows that a mix ratio of PbI2/Pb(NO3)(2) (70:30) synergistically enhances emission homogeneity throughout the film.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Physics, Applied
Jianning Huang, Zhijian Zhong, Zhiguo Jiang, Fangliang Gao, Yong Zhang, Feng Liu, Yanliang Zhao, Said Nasir Khisro, Xinman Chen
Summary: A self-driven optical communication system based on a high-performance graphene/n-Si hybrid photodetector was developed, showing stable signal transmission under zero bias. The hybrid device exhibited good performance at a wavelength of 520 nm with high photoresponsivity, specific detectivity, and low noise equivalent power.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Aadil Ahmad Bhat, Nitesh Singh, Rajesh Nair, Erik Dujardin, Jadab Sharma
Summary: The recent advancement in bandgap engineering through controlled doping has expanded the possibilities of vacancy ordered double halide perovskites (VO DHPs) by giving them designable optoelectronic properties. In this study, we conducted confocal mapping and macroscopic photoluminescence studies on Gd doped Cs2SnCl6. The insertion of Gd3+ ions into the crystal structure resulted in an additional stable room temperature low intensity photoluminescence emission at approximately 615 nm (-2.0 eV), in addition to the major emission at approximately 445 nm (-2.7 eV) due to the creation of defect states. Both Cs2SnCl6 and Gd:Cs2SnCl6 exhibited a crystalline cubic structure with the space group of Fm3m. The study provides a better understanding of the previously unknown second emission at room temperature in larger crystals of Gd:Cs2SnCl6 and its potential implications in quantum photonics.
Article
Materials Science, Multidisciplinary
Sixiang Wang, Yichang Wang, DaeHo Yoon, Tianrong Li, Yuhua Wang
Summary: In this study, a sub-micrometer green phosphor was successfully prepared by doping Mn2+ in a small-sized organic-inorganic hybrid Zn(ii) bromide (C8H20N)2ZnBr4. The resulting (C8H20N)2Zn0.7Mn0.3Br4 exhibited a particle size around 700 nm, an emission peak at 517 nm with a narrow full width at half maximum of 47 nm, a high photoluminescence quantum yield of about 80%, and a stable photoluminescence intensity under continuous UV-light illumination for 30 days. These findings highlight the potential of (C8H20N)2Zn0.7Mn0.3Br4 as a valuable candidate for Mini-LEDs and Micro-LEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Review
Chemistry, Physical
Moses Kodur, Rishi E. Kumar, Yanqi Luo, Deniz N. Cakan, Xueying Li, Michael Stuckelberger, David P. Fenning
ADVANCED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Michael E. Stuckelberger, Tara Nietzold, Bradley M. West, Yanqi Luo, Xueying Li, Jeremie Werner, Bjorn Niesen, Christophe Ballif, Volker Rose, David P. Fenning, Mariana Bertoni
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Andreas Schropp, Ralph Doehrmann, Stephan Botta, Dennis Brueckner, Maik Kahnt, Mikhail Lyubomirskiy, Christina Ossig, Maria Scholz, Martin Seyrich, Michael E. Stuckelberger, Patrik Wiljes, Felix Wittwer, Jan Garrevoet, Gerald Falkenberg, Yakub Fam, Thomas L. Sheppard, Jan-Dierk Grunwaldt, Christian G. Schroer
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2020)
Article
Materials Science, Multidisciplinary
Jakub Holovsky, Michael Stuckelberger, Tomas Finsterle, Brianna Conrad, Amalraj Peter Amalathas, Martin Mueller, Franz-Josef Haug
Article
Chemistry, Physical
Christina Ossig, Christian Strelow, Jan Flugge, Andreas Kolditz, Jan Siebels, Jan Garrevoet, Kathryn Spiers, Martin Seyrich, Dennis Bruckner, Niklas Pyrlik, Johannes Hagemann, Andreas Schropp, Romain Carron, Gerald Falkenberg, Alf Mews, Christian G. Schroer, Tobias Kipp, Michael E. Stuckelberger
Summary: The research team demonstrated, for the first time, the simultaneous assessment of composition, structure, and performance in thin-film solar cells using sophisticated microscopy techniques. By using scanning X-ray microscopy on a Cu(In,Ga)Se-2 solar cell, they discovered structural features correlated with defects that limit the overall efficiency of the solar cell.
Article
Chemistry, Physical
Tara Nietzold, Nicholas Valdes, Michael E. Stuckelberger, Michelle Chiu, Trumann Walker, April M. Jeffries, Archana Sinha, Laura T. Schelhas, Barry Lai, William N. Shafarman, Mariana Bertoni
Summary: The study investigates the effect of KF-PDT on the composition and structure of CIS and ACIS absorbers, as well as the observed decrease in Voc in the ACIS + KF system. Through various experimental techniques, it was found that the addition of KF enhances current collection and reduces defect density.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Trumann Walker, Michael E. Stuckelberger, Tara Nietzold, Niranjana Mohan-Kumar, Christina Ossig, Maik Kahnt, Felix Wittwer, Barry Lai, Damien Salomon, Eric Colegrove, Mariana I. Bertoni
Summary: The study uses correlative X-ray microscopy to investigate the spatial distribution of copper in CdTe photovoltaic devices and its impact on charge collection. It reveals spatial segregation of copper around CdTe grain boundaries and the influence of copper incorporation on charge collection efficiency.
Article
Optics
Frank Seiboth, Adam Kubec, Andreas Schropp, Sven Niese, Peter Gawlitza, Jan Garrevoet, Vanessa Galbierz, Silvio Achilles, Svenja Patjens, Michael E. Stuckelberger, Christian David, Christian G. Schroer
Summary: In this study, we present a method to overcome manufacturing challenges in hard X-ray optics using a tailor-made refractive phase plate. With at-wavelength metrology and rapid prototyping, we demonstrate aberration correction for crossed multilayer Laue lenses, improving image quality significantly.
Article
Instruments & Instrumentation
Trumann Walker, Tara Nietzold, Niranjana Mohan Kumar, Barry Lai, Kevin Stone, Michael E. Stuckelberger, Mariana I. Bertoni
Summary: Micro- and nanoscale inhomogeneities have a significant impact on the performance of thin-film solar cell absorbers. A characterization stage has been developed to enable multi-scale, multi-modal operando measurements, facilitating the correlation between different material properties across length scales and measurement modalities.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Instruments & Instrumentation
Prerana Chakrabarti, Anna Wildeis, Markus Hartmann, Robert Brandt, Ralph Doehrmann, Giovanni Fevola, Christina Ossig, Michael Elias Stuckelberger, Jan Garrevoet, Ken Vidar Falch, Vanessa Galbierz, Gerald Falkenberg, Peter Modregger
Summary: This article reports on a goniometer-based X-ray diffraction setup implemented at the P06 beamline of PETRA III, which enables micrometre spatial resolution with a photon energy of 35 keV and above. The setup achieves a highly focused beam using compound refractive lenses, and allows for high-precision sample manipulation using a goniometer. Experimental examples demonstrate the determination of micro-structural properties in highly absorbing samples.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Chemistry, Physical
Abdellatif Saadaldin, Azat M. Slyamov, Michael E. Stuckelberger, Peter S. Jorgensen, Christian Rein, Mariana Mar Lucas, Tiago Ramos, Angel Rodriguez-Fernandez, Dominique Bernard, Jens W. Andreasen
Summary: We conducted a multi-modal study to investigate the electrical, chemical and structural properties of a kesterite thin-film solar cell. By using spatially-resolved X-ray beam induced current and fluorescence imaging techniques, we evaluated a fully functional device on a cross-section. The obtained data allowed us to establish correlations between the chemical composition, defects at interfaces, and the inhomogeneous deposition of layers with the local charge-collection efficiency of the device. Our observations were further supported by Monte Carlo simulations of high-energy X-ray interactions with the semiconductor device and finite-volume modeling of the charge-collection efficiency.
FARADAY DISCUSSIONS
(2022)
Proceedings Paper
Energy & Fuels
Catharina Ziska, Christina Ossig, Niklas Pyrlik, Romain Carron, Enrico Avancini, Giovanni Fevola, Andreas Kolditz, Jan Siebels, Tobias Kipp, Zhonghou Cai, Martin Holt, Michael E. Stuckelberger
2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2020)
Proceedings Paper
Energy & Fuels
Niklas Pyrlik, Christina Ossig, Catharina Ziska, Giovanni Fevola, Jan Garrevoet, Gerald Falkenberg, Andreas Schropp, Michael E. Stuckelberger
2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2020)
Proceedings Paper
Energy & Fuels
Srisuda Rojsatien, Trumann Walker, Tara Nietzold, Barry Lai, Eric Colegrove, Michael Stuckelberger, Arun K. M. Kanakkithodi, Maria Chan, Mariana Bertoni
2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2020)
Article
Energy & Fuels
Michael E. Stuckelberger, Tara Nietzold, Bradley West, Rouin Farshchi, Dmitry Poplavskyy, Jeff Bailey, Barry Lai, Jorg M. Maser, Mariana Bertoni
JOURNAL OF PHYSICS-ENERGY
(2020)
