Article
Nanoscience & Nanotechnology
Aditi Sahoo, Tufan Paul, Soumen Maiti, Rupak Banerjee
Summary: 2D CsPb2Br5 synthesized through chemical precipitation method exhibits high dielectric constant and low dielectric loss, showing great potential in energy harvesting and storage devices.
Article
Materials Science, Multidisciplinary
Esma Ugur, Erkan Aydin, Michele De Bastiani, George T. Harrison, Bumin K. Yildirim, Sam Teale, Bin Chen, Jiang Liu, Mingcong Wang, Akmaral Seitkhan, Maxime Babics, Anand S. Subbiah, Ahmed Ali Said, Randi Azmi, Atteq Ur Rehman, Thomas G. Allen, Philip Schulz, Edward H. Sargent, Frederic Laquai, Stefaan De Wolf
Summary: By tuninging the dimensionality of 2D perovskites, an improved passivation at the interface and enhanced hole extraction can be achieved, resulting in improved performance and higher photocurrent in perovskite solar cells.
Article
Chemistry, Physical
Manoj Singh, Tufan Paul, Pulak Pal, Aditi Sahoo, Lokesh Singh Tanwar, Nisha Hiralal Makani, Aswini Ghosh, Rupak Banerjee
Summary: The emergence of lead-free metal-halide perovskites in modern-day energy research is primarily due to their competent semiconducting and optoelectronic properties, as well as their nontoxicity and improved stability in ambient operating conditions. In this article, the authors report on the single-crystal growth of a bimetallic two-dimensional layered Rb4Ag2BiBr9 and explore its dielectric, piezoelectric, and ferroelectric properties. They investigate the dielectric attributes by studying the temperature-dependent complex impedance, complex electric modulus, and AC conductivity, and analyze the ion transport and relaxation mechanisms in Rb4Ag2BiBr9. The authors also demonstrate the thermal and ambient stability of the material, as well as its piezoelectric and ferroelectric properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Naveen Kumar Tailor, Saurabh K. Saini, Pankaj Yadav, Mahesh Kumar, Soumitra Satapathi
Summary: Lead-free Cs2AgBiBr6 double perovskites show potential as an alternative to lead-based halide perovskites for photovoltaic and optoelectronic applications. This study reveals that the formation of small polarons and their localization limit the carrier dynamics in Cs2AgBiBr6 double-perovskite halide materials. The dominant conduction mechanism is found to be single polaron hopping. These findings provide important insights into the intrinsic limitations of Cs2AgBiBr6 perovskites and their applicability to other bismuth-based semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Rishi Pal, Sneh Lata Goyal, Ishpal Rawal, Vivek Gupta
Summary: The dielectric properties of in-situ polymerized polyaniline-multiwalled carbon nanotubes (PANI/MWCNTs) nanocomposite sample were analyzed as a function of temperature and applied frequency. The introduction of MWCNTs into the PANI matrix during polymerization and the reduction via chemical treatment with ammonia resulted in a lower conducting dielectric state. XRD pattern showed the semi-crystalline nature of the prepared sample. The dielectric constant increased with temperature and decreased with applied frequency, and the enhanced dielectric properties were attributed to the mobility of electric dipoles and reduced dc electrical conductivity due to the reduction of PANI/MWCNTs nanocomposite.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Serhii Polishchuk, Michele Puppin, Alberto Crepaldi, Gianmarco Gatti, Dmitry N. Dirin, Olga Nazarenko, Nicola Colonna, Nicola Marzari, Maksym Kovalenko, Marco Grioni, Majed Chergui
Summary: Describing the nanoscale charge carrier transport at surfaces and interfaces is crucial for designing high-performance optoelectronic devices. In this study, time- and angle-resolved photoelectron spectroscopy was used to investigate the ultrafast decay of carrier population associated with surface-to-bulk transport. The study achieved sub-nanometer spatial resolution normal to the surface and femtosecond time scale tracking.
Article
Chemistry, Inorganic & Nuclear
Xue-Qin Huang, Tian Gan, Yan-Zi Lu, Zhe-Kun Xu, Zhong-Xia Wang, Wei-Qiang Liao
Summary: By successfully synthesizing a one-dimensional organic-inorganic halide perovskite DMEACdCl(3), it was revealed that it displayed obvious dielectric relaxation characteristics, with distinct anomalies in both the dielectric real part and dielectric loss at different frequencies, and significant relaxation behavior in a wide temperature range.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Yuan Zhou, Zhixuan Tian, Yanzhi Cai, Chengye Liu, Yifan Li, Xiang Li
Summary: Tm2O3 was introduced into the KNN structure for the first time in this study, and (1-x)K0.5Na0.5Nb0.7Ta0.3O3xTm(2)O(3) (x=0.1-1.0%) powders were synthesized through a solvothermal method. The corresponding ceramics were prepared via atmospheric sintering. The introduction of Tm3+ promoted the refinement of KNN grain and resulted in significant increase in room-temperature dielectric permittivity and relaxation dispersion.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Anil Reddy Pininti, James M. Ball, Munirah D. Albaqami, Annamaria Petrozza, Mario Caironi
Summary: The study investigates the time-dependent electrical characteristics of field-effect transistors based on methylammonium lead iodide semiconductor and observes significant variations in output current, indicating hindered charge carrier mobility due to ion accumulation at grain boundaries. This research reveals the dynamic nature of field effect in solution-processed metal-halide perovskites and provides a methodology for characterizing charge carrier transport in emerging semiconductors.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Christian Tantardini, Sebastian Kokott, Xavier Gonze, Sergey Levchenko, Wissam A. Saidi
Summary: In this study, the stability of small polarons in methylammonium lead iodide perovskite is investigated using density functional theory. It is found that the electron small polaron is unstable, while the hole small polaron is metastable at realistic operation temperatures. The hole polaron, with its close proximity to the conduction band and metastability, is expected to have a significant impact on charge-carrier recombination.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Physical
Jasleen K. Bindra, Pragya R. Shrestha, Sebastian Engmann, Chad Cruz, Lea Nienhaus, Emily G. Bittle, Jason P. Campbell
Summary: We propose a novel method to resolve the Delta o-' and Delta o-'' components of Delta o- using a nonresonant coplanar transmission line and a microwave interferometric detection scheme. The use of a phase-sensitive microwave interferometer greatly enhances sensitivity and eliminates the need for a resonant cavity. This broadband detection scheme allows for direct measurement of Delta o-. The relationship between the experimental phase shift and Delta o-' and Delta o-'' components is decoded through in situ electron spin resonance (ESR) measurement, which is confirmed by ESR line shape analysis. We demonstrate the utility of this technique on thin films of poly(3-hexylthiophene): [6,6]-phenylC61-butyric acid methyl ester (P3HT:PCBM) and perovskite MA0.85FA0.15PbI3 films on glass.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Kai Li, Zhi-Gang Li, Baozhu Zhang, Yong-Qiang Chen, Huaqiang Cao, Wei Li
Summary: A new hybrid organic-inorganic perovskite, (R-3AQ)KI3, with a typical perovskite structure, has been synthesized and characterized. The material shows a reversible order-disorder phase transition and emits yellowish-green light under UV irradiation. The calculated electronic structure indicates a direct bandgap and the mechanical robustness of (R-3AQ)KI3 suggests its suitability for sensing applications.
Article
Chemistry, Multidisciplinary
Maciej Klein, Yutao Wang, Jingyi Tian, Son Tung Ha, Ramon Paniagua-Dominguez, Arseniy Kuznetsov, Giorgio Adamo, Cesare Soci
Summary: Emerging immersive visual communication technologies require light sources with complex functionality for dynamic control of light properties. Flat optics based on artificially structured metasurfaces offer a viable solution, but integrating them into electrically driven devices is challenging. This study demonstrates a new approach to monolithic integration of a dielectric metasurface into a perovskite light-emitting transistor, enhancing the electroluminescence intensity and enabling dynamic tunability of polarization. This concept opens up unlimited opportunities for light management strategies based on metasurface design and integration.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Aditi Sahoo, Tufan Paul, Pulak Pal, Nisha Hiralal Makani, Aswini Ghosh, Rupak Banerjee
Summary: In this study, the dielectric, piezoelectric, and ferroelectric properties of a chiral perovskite (R-CYHEAPbI(3)) were investigated. The transport and relaxation mechanisms were analyzed using different models. The conduction mechanism was found to change during the ferroelectric-to-paraelectric phase transition. The saturation polarization and piezoelectric constant were also measured, and a chiral perovskite composite film was fabricated for energy harvesting applications.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Ye Zhang, Ning Sui, Zhihui Kang, Xiangdong Meng, Long Yuan, Xianfeng Li, Han-zhuang Zhang, Jiaqi Zhang, Yinghui Wang
Summary: Double perovskite nanocrystals have gained much attention due to their non-toxicity and excellent semiconductor properties. In this study, a series of Cs4CuxAg2-2xSb2Cl12 nanocrystals with different Cu2+ contents were synthesized, and the relationship between Cu2+ content and their photo-physical properties was investigated. The results showed that Cu2+ content can affect the band gap transition and absorption coefficient of the nanocrystals, which in turn influences the operation of photo-detectors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Kalyani Patrikar, Urvashi Bothra, Valipe Ramgopal Rao, Dinesh Kabra
Summary: Coating electrodes with SAM to increase the work function of Cu surface does not necessarily correlate with trends in R-C and OFET drain current.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
Gopa Sardar, Atul Shukla, Evan G. Moore, Gangadhar Banappanavar, Shih-Chun Lo, Ebinazar B. Namdas, Dinesh Kabra
Summary: An aryl-polyfluorene polymer with high photoluminescence quantum yield and reduced excimer emission in its neat film is found to be suitable for laser applications. The low excitation energy and ASE threshold can be achieved by adjusting the aryl groups on the polymer chain.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Laxmi, Dinesh Kabra
Summary: The origin of broadband emission in two-dimensional layered halide perovskites is studied using temperature-dependent time-resolved photoluminescence (PL) spectra. The broad emission is observed due to the coupling of triplet states in the organic barrier and inorganic well.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Kashimul Hossain, Shivam Singh, Dinesh Kabra
Summary: Perovskite solar cells (PSCs) are the fastest-growing photovoltaic devices that have shown improved efficiency and stability through introducing multiple cations into the perovskite crystal structure. Through frequency-dependent photocurrent and dielectric measurements, this study compared PSCs based on triple monovalent cation CsFAMA with PSCs based on single monovalent cation MAPI. The results showed that CsFAMA-based PSCs had a lower dielectric relaxation time constant (tau(d)) compared to MAPI-based PSCs, which is attributed to a lower dielectric constant. The study also found a correlation between the relaxation process and the presence of monovalent cations, relative defect density, and thermal stability.
ACS APPLIED ENERGY MATERIALS
(2022)
Editorial Material
Materials Science, Multidisciplinary
Zhuoying Chen, Dinesh Kabra, Yana Vaynzof
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Vijay Tripathi, Siddarth Jain, Dinesh Kabra, Leela S. Panchakarla, Arnab Dutta
Summary: Strategically doped metal oxide nanomaterials, such as copper vanadate with cobalt doping, show excellent reactivity for hydrogen evolution reaction and glycerol oxidation reaction. The Co-10%-CuV sample achieved low overpotentials and high current density, with formate identified as the major product during glycerol oxidation reaction. This study demonstrates the potential of Co-10%-CuV as a catalyst for biomass-driven hydrogen production.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Xin Zhang, Weiming Qiu, Sofia Apergi, Shivam Singh, Paulo Marchezi, Wenya Song, Christian Sternemann, Karim Elkhouly, Dong Zhang, Aranzazu Aguirre, Tamara Merckx, Anurag Krishna, Yuanyuan Shi, Andrea Bracesco, Cristian van Helvoirt, Frennie Bens, Valerio Zardetto, Jan D'Haen, Anran Yu, Geert Brocks, Tom Aernouts, Ellen Moons, Shuxia Tao, Yiqiang Zhan, Yinghuan Kuang, Jef Poortmans
Summary: Inverted p-i-n perovskite solar cells have potential for commercialization, but the interfaces with charge transport layers cause major power conversion efficiency (PCE) loss and instability. By using 2-thiopheneethylammonium chloride (TEACl), we molecularly engineer both interfaces and achieve optimized band alignment, suppressed nonradiative recombination, and improved interfacial contact. The resulting solar cells demonstrate a PCE of 24.3% and good performance retention after 1000 hours of illumination.
ACS ENERGY LETTERS
(2023)
Article
Energy & Fuels
Abhijit Singha, Ananta Paul, Sakshi Koul, Vikas Sharma, Sudhanshu Mallick, Kavaipatti Ramanathan Balasubramaniam, Dinesh Kabra
Summary: This study reports a four-terminal tandem device that integrates NIR-transparent perovskite solar cells with Si solar cells, addressing the stability gap issue. The optimized NIR-transparent perovskite solar cells, with a sputtered top transparent conducting electrode and oxide buffer layer, achieved high power conversion efficiencies of 17.1% and 16.0% for small and large areas, respectively. The integration of these cells with commercial monocrystalline PERC Si solar cells resulted in 4T tandem devices with a PCE exceeding 26%.
Article
Nanoscience & Nanotechnology
Kalyani Patrikar, V. Ramgopal Rao, Dinesh Kabra, Anirban Mondal
Summary: Contact resistance in organic devices is determined by the energy level mismatch and electronic coupling between injecting electrodes and organic semiconductors. Our study reveals the importance of energy levels and electronic coupling in governing charge transfer and contact resistance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Nrita Gaur, Gangadhar S. Banappanavar, Dinesh Kabra
Summary: This paper presents a study on the stability of organic semiconductor-based optoelectronic devices. A comparative study was conducted on thermally activated delayed fluorescence (TADF) based organic light emitting diodes (OLEDs) with inorganic electron injection interlayers, lithium fluoride (LiF) and magnesium fluoride (MgF2). The OLEDs with LiF interlayer showed higher external quantum efficiency (EQE) of 19.7%, while the MgF2 interlayer-based OLEDs showed slightly lower average EQE of 19.1%. However, the MgF2-based OLEDs exhibited approximately seven-fold enhancement in stability compared to the LiF-based OLEDs.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Bhupesh Bhardwaj, Urvashi Bothra, Shivam Singh, Sophie Mills, T. J. Ronningen, Sanjay Krishna, Dinesh Kabra
Summary: The study explores the effects of active layer thickness and different interfacial layers on the suppression of leakage current in photodetectors. High-sensitivity perovskite photodetectors with a broadband response and low noise current are fabricated using a specific device structure. Optimal thickness of the active layer and use of a specific electron transport layer further enhance the overall performance of the photodetectors. Comparison with published reports demonstrates the advancements achieved in this study.
APPLIED PHYSICS REVIEWS
(2023)
Article
Chemistry, Physical
Urvashi Bothra, Pramiti Hui, Wen Liang Tan, Eliot Gann, Hariprasad Venugopal, Chandramouli Subramaniam, Amelia C. Y. Liu, Christopher R. McNeill, Dinesh Kabra
Summary: Improvement in the efficiency of organic photovoltaics (OPVs) is mainly attributed to non-fullerene acceptors (NFAs). However, NFAs exhibit an anisotropic chemical structure, resulting in over-sized aggregation, which can affect the exciton dissociation and charge transport. This study investigates the composition and local molecular ordering in bulk heterojunction (BHJ) blend films of the polymer donor and NFAs by manipulating the drying kinetics of the film formation. The researchers found that the molecules are oriented differently at the edge and at the center of these domains, a feature that has not been observed previously in spin-coated films containing NFAs.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Nakul Jain, Rishabh Saxena, Sumukh Vaidya, Wenchao Huang, Adam Welford, Christopher R. McNeill, Dinesh Kabra
Summary: This study investigates the changes in Quasi-Fermi-level (QFL) splitting in different alloy compositions of mixed semiconductor materials under light illumination, revealing the impact of light-induced charge carriers on open-circuit voltage (V-OC). Research on mixed semiconductor materials is important in the field of solar cells.
MATERIALS ADVANCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Dipanjan Mondal, Gopa Sardar, Dinesh Kabra, Maravanji S. Balakrishna
Summary: A series of doubly B <- N fused compounds were synthesized and their electronic properties and structural features were investigated by experimental and computational studies. Compound 6 showed a high quantum yield in CH2Cl2, while compound 7 exhibited the lowest quantum yield. The study provides important strategies for the design of effective B <- N bridged compounds and reveals the photophysical properties of the compounds. Compounds 5 and 6 showed good performance in OLEDs.
DALTON TRANSACTIONS
(2022)