Article
Chemistry, Analytical
Jie Chen, Jiwei Shao, Ruifen Sun, Weiwei Zhang, Yun Huang, Jingcheng Zheng, Yuwu Chi
Summary: Recently, there has been intensive research on the newly emerging lead halide perovskite nanocrystals (PNCs) in various fields. However, the study on PNCs for bio- and chemical sensing in aqueous medium faces challenges due to their instability. In this work, water-dispersed PNCs (W-PNCs) with strong fluorescence and water stability were synthesized. These uncoated W-PNCs can sensitively and stably sense targets in pure water phase, and a smartphone-based sensing platform for halide ions has been established. The highly fluorescent W-PNCs have promising applications in chemical sensing, biosensing, and bioimaging.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Pratap Vishnoi, Julia L. Zuo, Xiaotong Li, Devesh Chandra Binwal, Kira E. Wyckoff, Lingling Mao, Linus Kautzsch, Guang Wu, Stephen D. Wilson, Mercouri G. Kanatzidis, Ram Seshadri, Anthony K. Cheetham
Summary: This study reports a new type of hybrid layered double perovskite (HLDP) halides whose optical band gaps can be tuned by the layer composition, and the magnetic behavior is related to the material's composition.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Applied
Nur Fadilah Jamaludin, Benny Febriansyah, Yan Fong Ng, Natalia Yantara, Mingjie Li, David Giovanni, Jianhui Fu, Yeow Boon Tay, Tom Baikie, Tze Chien Sum, Nripan Mathews, Subodh Mhaisalkar
Summary: This study focuses on improving charge transfer characteristics in multidimensional perovskites by using bi-functionalized aromatic cations. While greater intermolecular bonding is proposed to enhance charge transfer rates, it also leads to lead halide octahedral distortion, affecting perovskite luminescence properties.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Rayan Chakraborty, Parikshit Kumar Rajput, Gokul M. Anilkumar, Shabnum Maqbool, Ranjan Das, Atikur Rahman, Pankaj Mandal, Angshuman Nag
Summary: Structural non-centrosymmetry in semiconducting organic-inorganic hybrid halide perovskites introduces functionalities like anomalous photovoltaics and nonlinear optical properties. By creating dissimilar non-covalent interactions at the organic-inorganic interface, Pb- and Bi-based two- and one-dimensional hybrid perovskites with polar non-centrosymmetric space groups can be designed. The non-centrosymmetry results in visible to infrared tunable nonlinear optical properties and anomalous photovoltaic effect in (MIPA)2PbI4 and (H3N-(CH2)3-NH(CH3)2)BiI5.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Yuhang Liang, Xiangyuan Cui, Feng Li, Catherine Stampfl, Jun Huang, Simon P. Ringer, Rongkun Zheng
Summary: Identification and passivation of defect-induced electron-hole recombination centers are crucial for improving efficiency of hybrid perovskite solar cells. Hydrogen interstitials, particularly H-i(-), formed under I-poor synthesis conditions, act as detrimental deep-level defects leading to efficient recombination and decreased cell performance. Br doping can mitigate atomic displacement caused by H-i(-) and suppress deep localized states, providing useful information for defect engineering to enhance solar cell performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Michael L. Aubrey, Abraham Saldivar Valdes, Marina R. Filip, Bridget A. Connor, Kurt P. Lindquist, Jeffrey B. Neaton, Hemamala Karunadasa
Summary: Using organic molecules as directing groups, a variety of perovskite heterostructures are self-assembled in solution to form single crystals. This method allows precise stacking of different 2D structures, revealing exotic phenomena at their interfaces. The interleaving of inorganic structures found in these heterostructures can lead to new electronic transitions, demonstrating the potential for directed synthesis of complex semiconductors that self-assemble in water.
Article
Chemistry, Multidisciplinary
Barbara Primera Darwich, Nestor Guijarro, Han-Hee Cho, Liang Yao, Luc Monnier, Pascal Schouwink, Mounir Mensi, Jun-Ho Yum, Kevin Sivula
Summary: Incorporating extended pi-conjugated organic cations into layered lead halide perovskites shows promise in improving device performance and stability. Tuning the chemical structure of ligands is crucial, with the resulting Lewis adduct between the BDT cation and surface iodide vacancies enhancing charge transport in the device active layer.
Article
Materials Science, Multidisciplinary
Michael Seifert, Moemi Kawashima, Claudia Roedl, Silvana Botti
Summary: Zinc blende copper iodide, a p-type semiconductor transparent in the visible range, has potential for transparent electronics, with the layered beta-phase being suitable for 2D applications. Both phases exhibit small light-hole effective masses and large band gaps, characteristics that are also present in the beta-CuI monolayer, indicating the potential for a high-performance transparent monolayer conductor for 2D electronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Taniya Dutta, Somnath M. Kashid, Rahul Hooda, Tariq Sheikh, Arindam Chowdhury, Angshuman Nag
Summary: The study investigates the interaction of edge and interior excitons with Mn2+ ions in (BA)2PbBr4 crystals. It is found that edge excitons mainly sensitize the Mn2+ ions due to their preferred doping near layer edges. The spatial separation between interior excitons and dopant centers, caused by both low doping concentration and edge doping, reduces the energy transfer efficiency.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Xu Li, Yuantian Zheng, Ronghua Ma, Zefeng Huang, Chunfeng Wang, Mingju Zhu, Fuchun Jiang, Yangyang Du, Xian Chen, Bolong Huang, Feng Wang, Bohan Wang, Yu Wang, Dengfeng Peng
Summary: By synthesizing a series of CaZnOS layer-structured powders doped with Sb3+, this work has achieved a wide range of mechanical luminescence spectra, adjustable photoluminescence with double peaks, and systematically studied the X-ray-induced luminescence characteristics. Furthermore, ultra-broad warm white light mechanical luminescence emission was achieved in Sb3+ and Bi3+ co-doped samples, showing potential applications in smart lighting, displays, stress sensors, and X-ray imaging and detection.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Barnali Mondal, Athunya Poovathan, Tariq Sheikh, Angshuman Nag
Summary: This study reports the synthesis and optical properties of Yb3+-doped (PEA)(2)PbBr4. The crystals exhibit a plate-like morphology and thin nanoplatelets can be obtained by sonication. The presence of Yb3+ ions enables the crystals to emit light in the near-infrared range, which is important for applications in near-infrared light-emitting diodes.
Article
Materials Science, Multidisciplinary
Renita M. D'Souza, Timothy L. Kelly
Summary: This study discusses the effect of high-energy X-ray radiation on lead halide perovskites and finds that the rate of radiation damage in perovskite films has low dependence on composition and humidity. An increasing radiation dose is associated with structural disorder, including the formation of ion vacancies and Schottky defects. These results are an important first step in the design of robust, radiation-tolerant, and perovskite-based X-ray detectors.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Nawishta Jabeen, Anum Zaidi, Ahmad Hussain, Najam Ul Hassan, Jazib Ali, Fahim Ahmed, Muhammad Usman Khan, Nimra Iqbal, Tarek A. Seaf Elnasr, Mohamed H. Helal
Summary: Organic-inorganic lead halide perovskites materials have attractive electrical and optical properties, and single-layer and multilayer CH3NH3PbIBr2 thinfilms were successfully grown by a one-step spin coating method. These films showed leaky ferroelectric behavior and had different absorption peaks and band gaps. The fabricated CH3NH3PbIBr2 thinfilms also demonstrated high power conversion efficiency and fill factor, making them promising candidates for optoelectronic and photovoltaic devices.
Article
Energy & Fuels
Juvet Nche Fru, Nolwazi Nombona, Mmantsae Diale
Summary: Lead iodide-rich methylammonium lead bromide-iodide thin-films were prepared using a sequential physical vapor deposition method. The properties of the films were studied as the thickness of methylammonium bromide was increased, revealing changes in structural, optical, morphological, and electrical properties. The study provides insights into the growth and characteristics of mixed halide perovskites for solar cell applications.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Xiaoqi Li, Dong Li, Yu Peng, Yi Liu, Jiaqi Wang, Lina Li, Yunpeng Yao, Xitao Liu, Junhua Luo
Summary: A new layered iodide perovskite with highly structural anisotropy and narrow bandgap was developed, enabling the fabrication of large crystals for photodetectors that show impressive response to polarized light.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Shivam Singh, Dinesh Kabra
Summary: The energy band gaps of Pb halide perovskites are higher than the required band gap for solar cells, but Sn-based perovskites with lower band gaps have shown contradictory results in terms of charge carrier recombination. Despite lower open-circuit voltage, the slow relaxation lifetime of charge carriers in Sn-based perovskites can be attributed to recombination through defect states. Furthermore, the rate law of charge carrier decay has nonlinear dependence on n in Sn-based perovskites, indicating a unique behavior compared to other cases.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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
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)
Article
Chemistry, Multidisciplinary
Balu Praveenkumar, Jan K. Zareba, Dinesh Kabra, Satishchandra Ogale, Ramamoorthy Boomishankar, Neetu Prajesh, Vijay Bhan Sharma, Shatruhan Singh Rajput, Chandan Kumar Singh, Prashant Dixit
Summary: In this study, a Zn(II)-based ferroelectric one-dimensional coordination network with high piezoelectric performance is reported and applied in piezoelectric nanogenerators. The structure and properties of the coordination polymer are revealed through experiments and calculations. The fabricated flexible composite devices show high power density output.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(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
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)
