Article
Multidisciplinary Sciences
Hui-Min Wang, Xin-Bao Liu, Shi-Qi Hu, Da-Qiang Chen, Qing Chen, Cui Zhang, Meng-Xue Guan, Sheng Meng
Summary: Laser-controlled coherent phonon excitation significantly enhances carrier mobility by accelerating polaron transport. Selective excitation of specific phonon modes that overlap with the polaronic lattice deformation can reduce the energy barrier for polaron hopping. Nonadiabatic couplings between the electronic and ionic subsystems promote polaron migration through phonon-phonon scattering.
Article
Physics, Applied
Marten Koopmansa, L. Jan Anton Kosterb
Summary: Doping has a significant impact on the Seebeck coefficient in organic semiconductors, with high carrier-carrier interactions reducing the Seebeck coefficient. Reducing these interactions can lead to an increased Seebeck coefficient and power factor, potentially increasing the ZT value above 1 for organic thermoelectrics.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Mengjing Wang, Aakash Kumar, Hao Dong, John M. Woods, Joshua Pondick, Shiyu Xu, David J. Hynek, Peijun Guo, Diana Y. Qiu, Judy J. Cha
Summary: A new electronic phase in WTe2 induced by lithium intercalation is discovered, which exhibits increasing resistivity with decreasing temperature and lower carrier density compared to the semimetallic phase. The theoretical calculations and in situ transport data suggest that this new phase is a potential charge density wave phase with a bandgap of approximately 0.14 eV. The structural characterization reveals large lattice distortions in the new phase.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Domenic Prete, Valeria Demontis, Valentina Zannier, Maria Jesus Rodriguez-Douton, Lorenzo Guazzelli, Fabio Beltram, Lucia Sorba, Francesco Rossella
Summary: We fabricated dual-gated electric double layer (EDL) field effect transistors based on InAs nanowires gated with an ionic liquid, and performed electrical transport measurements at different temperatures. The study found that adjusting the spatial distribution of ions in the ionic liquid can induce doping in the nanostructures, and the carrier concentration and mobility are significantly affected by the liquid gate voltage changes.
Article
Chemistry, Multidisciplinary
Xiaochen Huai, Gian Andrea Rizzi, Yanfeng Wang, Qige Qi, Gaetano Granozzi, Wangyang Fu, Zhengjun Zhang
Summary: This paper introduces the use of fluorinated tantalum to improve the performance of nanotube materials, which has important application potential in perovskite solar cells.
Article
Energy & Fuels
Juran Kim, Ha Kyung Park, Yunae Cho, Sammi Kim, Kee-Jeong Yang, Dae-Hwan Kim, Jin-Kyu Kang, William Jo
Summary: In this study, the optimization process of NaF layers in CZTSSe films deposition was investigated, and the effects of Na on the growth and carrier transport of kesterite were studied.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Materials Science, Multidisciplinary
Mirgender Kumar, Aya Hekmet Makki, B. Purusottam Reddy, Kwang-Su Seong, Si-Hyun Park
Summary: A study was conducted on zinc oxide quantum dots synthesized using three solvents to understand the carrier dynamics responsible for luminescence. Deconvolution of steady-state luminescence data and tri-exponential decay fit of TRPL curves were used to determine the contributions of different luminescence bands and charge carrier dynamics, as well as to optimize the luminescence quantum yield through solvent-induced decay processes.
Article
Chemistry, Analytical
Lu Wang, Zejing Guo, Qing Lan, Wenqing Song, Zhipeng Zhong, Kunlin Yang, Tuoyu Zhao, Hai Huang, Cheng Zhang, Wu Shi
Summary: In this study, a controllable carrier doping effect was achieved in graphene and MoS2 FETs through electron-beam doping, enhancing carrier modulation capabilities in 2D materials and showing great potential for development.
Article
Chemistry, Physical
A. V. Pashkevich, A. K. Fedotov, E. N. Poddenezhny, L. A. Bliznyuk, J. A. Fedotova, N. A. Basov, A. A. Kharchanka, P. Zukowski, T. N. Koltunowicz, O. V. Korolik, V. V. Fedotova
Summary: This study investigated the relationship between the structure and electric properties of composite ceramics and found that the type of doping agents and synthesis process can affect the phase composition and performance of the materials. In terms of electron transport, the contribution of the C-band depends on the low and deep donor centers. Doping with iron enhanced the performance of ZnO-based ceramic samples, while doping with cobalt resulted in a weaker effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Neeraj Bangruwa, Mayra Suryansh, Mayra Peralta, Rafael Gutierrez, Gianaurelio Cuniberti, Debabrata Mishra
Summary: In this study, we investigate the sequence-dependent chiral-induced spin selectivity (CISS) in double-stranded DNA. By using time-correlated single-photon counting and electrochemical impedance spectroscopy, we find that the average lifetime of photo-excited electrons is influenced by the CISS effect generated by the DNA molecule. The observed experimental trends are supported by simulations using a tight binding method.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yonatan Dubi
Summary: In this study, a theoretical model for the CISS effect in bio-molecular junctions is proposed, which explains the origin of the CISS effect and allows for quantitative analysis of experimental data. This is of great significance for a deeper understanding in the field of molecular electronics and nano-scale transport.
Article
Physics, Multidisciplinary
Kaynat Alvi, S. Nazir
Summary: In this study, we investigated the combined effects of Co-doping and strain on the thermodynamics and electronic structure of FeTe2 using ab-initio calculations. Co-doping induced n-type conductivity in the system, with a substantial charge carrier density. The metallicity mainly came from Co-3d and Fe-3d orbitals. The Co-doped FeTe2 structure showed stability and n-type conduction under both compressive and tensile strains.
Article
Chemistry, Physical
Tao Huang, Zhicheng Zhu, Chen Zhao, Wenchi Kong, Xuhang Chen, Ruiyan Li, Zhi Yu, Zhiming Shi, Dabing Li, Bai Yang, Weili Yu
Summary: By adjusting the carrier density and lateral transport of 2D Ruddlesden-Popper perovskites through a layer optimization strategy, ultra-high efficiency lateral structured photodetectors have been achieved.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Tao Xu, Jingtong Zhang, Chunyu Wang, Xiaoyuan Wang, Takahiro Shimada, Jie Wang, Hongxin Yang
Summary: Low-dimensional multiferroic metals, characterized by the coexistence of ferroelectricity, conductivity, and magnetism, have great potential for scientific and technological endeavors. In this study, intrinsic one-dimensional ferroelectrics and carrier doping-induced metallic multiferroics are designed and demonstrated in an atomic WOF4 wire. The wire exhibits pronounced ferroelectricity and the ability to sustain a high Curie temperature, while doping with electrons induces magnetism and metallic conductivity in coexistence with ferroelectric distortion.
JOURNAL OF MATERIOMICS
(2023)
Article
Chemistry, Physical
J. Terence Blaskovits, Kun-Han Lin, Raimon Fabregat, Iwona Swiderska, Helene Wu, Clemence Corminboeuf
Summary: The reorganization energy (lambda) is a key parameter in evaluating charge mobility in molecular solids, but its influence by conformational isomerism remains unclear. The study found an extreme dependence of lambda on the conformer geometry in complex HTMs, cautioning against extracting reorganization energy from a single molecular conformer optimized in the gas phase for structures with bulky substituents.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Maximilian T. Sirtl, Rik Hooijer, Melina Armer, Firouzeh G. Ebadi, Mahdi Mohammadi, Clement Maheu, Andreas Weis, Bas T. van Gorkom, Sebastian Haeringer, Rene A. J. Janssen, Thomas Mayer, Vladimir Dyakonov, Wolfgang Tress, Thomas Bein
Summary: The efficiency of lead-free halide perovskite solar cells based on Cs2AgBiBr6 has been limited to less than 3% since 2017 due to factors such as low electron diffusion length and poor selectivity of the contacts. In this study, 2D/3D hybrid double perovskites using phenethyl ammonium were introduced for the first time, resulting in a 10% improvement in efficiency compared to the 3D reference. This improvement is mainly attributed to higher V-OC values and improved recombination behavior and selectivity at the interface.
ADVANCED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Artur Trifonov, Stefan Grisard, Alexander N. Kosarev, Ilya A. Akimov, Dmitri R. Yakovlev, Julian Hoecker, Vladimir Dyakonov, Manfred Bayer
Summary: The optical properties of a methylammonium lead triiodide single crystal were studied, and an experimental photon-echo polarimetry method was developed to accurately determine the biexciton binding energy and optical coherence times.
Editorial Material
Chemistry, Physical
Moritz H. Futscher, Carsten Deibel
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Sandhya Tammireddy, Sebastian Reichert, Qingzhi An, Alexander D. Taylor, Ran Ji, Fabian Paulus, Yana Vaynzof, Carsten Deibel
Summary: The study investigates the formation and migration of ionic defects in metal halide perovskites, utilizing impedance spectroscopy to determine ion formation enthalpies and formation entropy changes in different thin films. By focusing on the iodide vacancy as the dominant defect, comparisons of entropy and enthalpy changes were made across various perovskite compositions. This approach is applicable to ionic conductors in general.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Fadis F. Murzakhanov, Georgy Vladimirovich Mamin, Sergei Borisovich Orlinskii, Uwe Gerstmann, Wolf Gero Schmidt, Timur Biktagirov, Igor Aharonovich, Andreas Gottscholl, Andreas Sperlich, Vladimir Dyakonov, Victor A. Soltamov
Summary: In this study, we demonstrated the coherent coupling of negatively charged boron vacancies (V-B(-)) with surrounding nuclei in hexagonal boron nitride (hBN), which meets the basic requirements for quantum technology applications. We successfully achieved the readout of the V-B(-) spin coherence using various techniques and showed the characteristics of elongation of coherence time and modulation of Hahn-echo decay. Additionally, the DFT calculation confirmed the confined electron-nuclear coupling in the defective layer.
Article
Nanoscience & Nanotechnology
Yong Ding, Bin Ding, Hiroyuki Kanda, Onovbaramwen Jennifer Usiobo, Thibaut Gallet, Zhenhai Yang, Yan Liu, Hao Huang, Jiang Sheng, Cheng Liu, Yi Yang, Valentin Ianis Emmanuel Queloz, Xianfu Zhang, Jean-Nicolas Audinot, Alex Redinger, Wei Dang, Edoardo Mosconic, Wen Luo, Filippo De Angelis, Mingkui Wang, Patrick Doerflinger, Melina Armer, Valentin Schmid, Rui Wang, Keith G. Brooks, Jihuai Wu, Vladimir Dyakonov, Guanjun Yang, Songyuan Dai, Paul J. Dyson, Mohammad Khaja Nazeeruddin
Summary: The incorporation of electron transport layers based on single-crystalline TiO2 rhombohedral nanoparticles enables the realization of stable and efficient large-area perovskite solar cell modules. The devices achieve high efficiency and stability, making them promising for practical applications.
NATURE NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
E. Kirstein, D. R. Yakovlev, M. M. Glazov, E. A. Zhukov, D. Kudlacik, I. Kalitukha, V. F. Sapega, G. S. Dimitriev, M. A. Semina, M. O. Nestoklon, E. L. Ivchenko, N. E. Kopteva, D. N. Dirin, O. Nazarenko, M. Kovalenko, A. Baumann, J. Hoecker, V Dyakonov, M. Bayer
Summary: This study presents experimental data for the values and anisotropies of the electron and hole Lande factors in lead halide perovskite materials, and shows their universal dependence on the band gap energy.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Hannes Hempel, Tom J. Savenjie, Martin Stolterfoht, Jens Neu, Michele Failla, Vaisakh C. Paingad, Petr Kuzel, Edwin J. Heilweil, Jacob A. Spies, Markus Schleuning, Jiashang Zhao, Dennis Friedrich, Klaus Schwarzburg, Laurens D. A. Siebbeles, Patrick Dorflinger, Vladimir Dyakonov, Ryuzi Katoh, Min Ji Hong, John G. Labram, Maurizio Monti, Edward Butler-Caddle, James Lloyd-Hughes, Mohammad M. Taheri, Jason B. Baxter, Timothy J. Magnanelli, Simon Luo, Joseph M. Cardon, Shane Ardo, Thomas Unold
Summary: This article combines the expertise of fifteen laboratories to quantitatively model the current-voltage characteristics of photovoltaic materials, using (Cs,FA,MA)Pb(I,Br)(3) halide perovskite thin-film as a case study. The study examines the impact of measurement conditions, alternate interpretations, and experimental inter-laboratory variations. The results show that terahertz, microwave, and photoluminescence measurements can provide consistent information on the mobility and lifetime of charge carriers in the material, which is crucial for the efficiency of solar cells.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Alberto Privitera, Jeannine Gruene, Akchheta Karki, William K. Myers, Vladimir Dyakonov, Thuc-Quyen Nguyen, Moritz K. Riede, Richard H. Friend, Andreas Sperlich, Alexander J. Gillett
Summary: This study investigates the formation mechanism of triplet excitons in organic solar cells, revealing differences in triplet formation between fullerene and nonfullerene acceptor systems. Engineering good donor and acceptor domain purity is crucial for suppressing losses via triplet excitons in OSCs.
ADVANCED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Erik Kirstein, Dmitri R. Yakovlev, Evgeny A. Zhukov, Julian Hoecker, Vladimir Dyakonov, Manfred Bayer
Summary: This study investigates the coherent spin dynamics of charge carriers and spin-dependent phenomena in MAPbI(3) single crystals. The experiments reveal that the spin of the charge carriers dephases within a few nanoseconds and has a relaxation time of 37 ns. The Larmor spin precession of both electrons and holes is observed in the Kerr rotation signals. Additionally, the exciton spin is measured using magnetoreflectivity.
Article
Chemistry, Multidisciplinary
Jeannine Gruene, Giacomo Londi, Alexander J. Gillett, Basil Staehly, Sebastian Lulei, Maria Kotova, Yoann Olivier, Vladimir Dyakonov, Andreas Sperlich
Summary: The development of non-fullerene acceptors (NFAs) in organic photovoltaics (OPV) has led to a significant progress in power conversion efficiencies, reaching nearly 20%. However, triplet states have been found to negatively affect device performance, leading to non-radiative losses and device degradation. A study using various spin-sensitive methods and quantum-chemical calculations identified the presence of triplet excitons in OPV blends, providing insights into the pathways for triplet formation and suggesting potential for improved charge generation to enhance OPV efficiencies.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Paul Weitz, Vincent Marc Le Corre, Xiaoyan Du, Karen Forberich, Carsten Deibel, Christoph J. Brabec, Thomas Heumueller
Summary: A method for accelerated stability testing of organic solar cells (OSCs) is presented using monochromatic light at high irradiation doses. The study reveals a degradation mechanism in PM6:Y6-based OSCs that causes an increased trap-state density inside the PM6:Y6 layer and highlights the dominant impact of illuminating wavelength on degradation patterns. The degradation rate of the devices scales linearly with light intensity, suggesting high intensity and spectrally selective degradation as a promising approach for accelerating stability testing of OSCs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Physics, Multidisciplinary
Maria Saladina, Christopher Woepke, Clemens Goehler, Ivan Ramirez, Olga Gerdes, Chao Liu, Ning Li, Thomas Heumueller, Christoph J. Brabec, Karsten Walzer, Martin Pfeiffer, Carsten Deibel
Summary: The density of states (DOS) plays a crucial role in understanding physical processes in organic disordered semiconductors, but its experimental determination is challenging. In this study, we evaluated the DOS by investigating recombination through tail states and analyzing the temperature and open-circuit voltage (Voc) dependence of the ideality factor. Our Suns-Voc measurements revealed an increase in energetic disorder towards the deeper regions of the band gap, deviating from the expected Gaussian or exponential DOS. The observed linear dependence of disorder on energy suggests a power-law DOS in organic solar cells.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Patrick Doerflinger, Yong Ding, Valentin Schmid, Melina Armer, Roland C. Turnell-Ritson, Bin Ding, Paul J. Dyson, Mohammad Khaja Nazeeruddin, Vladimir Dyakonov
Summary: This study investigates the effect of a stabilizing additive on the charge carrier mobility and lifetime in triple cation perovskite thin films under thermal stress. The results reveal different conductivity behaviors in two temperature regions and identify two dominant scattering mechanisms. The stabilizing additive limits temperature-activated mobile ions and retards degradation of the perovskite film, leading to improved performance and stability.
Article
Chemistry, Physical
Rik Hooijer, Andreas Weis, Waldemar Kaiser, Alexander Biewald, Patrick Doerflinger, Clement Maheu, Oleksandr Arsatiants, David Helminger, Vladimir Dyakonov, Achim Hartschuh, Edoardo Mosconi, Filippo De Angelis, Thomas Bein
Summary: Silver pnictohalides, as novel perovskite-inspired materials, have gained attention for their high stability, low toxicity, and promising efficiencies. However, research on the silver antimony iodides is lacking due to challenges in synthesis. In this study, the authors successfully prepared Ag-Sb-I thin films using thiourea as an additive and improved their morphology through alloying with copper. The resulting solar cells demonstrated an enhanced power conversion efficiency by reducing undesired side phases. The study also revealed the detrimental role of silver point defects and the beneficial effect of minor amounts of bismuth on the efficiency and stability of the Rudorffite materials.
CHEMISTRY OF MATERIALS
(2023)