Article
Chemistry, Inorganic & Nuclear
Ren-Jun Zhong, Kai-Wei Tsao, Chun-Hao Cheng, Cheng-Chan Liu, Chun-Ting Li
Summary: Electrochemically durable perovskite electrodes of nickel foam/TiO2/FA(Pb1-xGex)I-3, passivated using various surfactants of tetra-n-alkyl ammonium halides, were applied as good electro-catalysts on the counter electrodes in dye-sensitized solar cells. The use of these surfactants improved the performance of the cells.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Anwar Q. Alanazi, Masaud H. Almalki, Aditya Mishra, Dominik J. Kubicki, Zaiwei Wang, Lena Merten, Felix T. Eickemeyer, Hong Zhang, Dan Ren, Ahmed Y. Alyamani, Hamad Albrithen, Abdulrahman Albadri, Mohammad Hayal Alotaibi, Alexander Hinderhofer, Shaik M. Zakeeruddin, Frank Schreiber, Anders Hagfeldt, Lyndon Emsley, Jovana Milic, Michael Graetzel
Summary: This research focuses on the use of benzylammonium iodide to achieve a stable formamidinium lead iodide perovskite phase, with the microscopic structure elucidated using solid-state NMR spectroscopy and X-ray scattering measurements. Perovskite solar cells based on the FAPbI(3)(BzI)(0.25) composition achieve power conversion efficiencies exceeding 20%, with enhanced shelf-life and operational stability maintained after one year at ambient conditions, retaining 80% of the performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Julian A. Steele, Vittal Prakasam, Haowei Huang, Eduardo Solano, Dmitry Chernyshov, Johan Hofkens, Maarten B. J. Roeffaers
Summary: The thermodynamic instability of CsPbI3 perovskite devices at room temperature hinders their technological progress and widespread adoption. Analysis of crystal symmetry changes reveals that the stability of gamma-CsPbI3 is best rationalized from the point of view of crystal symmetry, with improved thermal-phase stability associated with the suppression of spontaneous strain formation and increased crystal symmetry at room temperature.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Renjie Chen, Yan Xu, Song Wang, Chao Xia, Yunpeng Liu, Bingjie Yu, Tongtong Xuan, Huili Li
Summary: Doping zinc ions into CsPbBr3 NCs can enhance photoluminescence properties and stability, improving the optical properties of the material. A white light-emitting diode (WLED) with high luminous efficiency and wide color gamut was fabricated using green-emitting CsPbBr3:Zn2+ doped NCs and red-emitting K2SiF6:Mn6+ phosphors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Chen Chen, Yi Rao, Zhipeng Li, Xiao Wang, Guanglei Cui, Wei Wang, Shuping Pang
Summary: This study demonstrates that self-condensation of formamidinium iodide occurs in the preparation of perovskite materials, forming the by-product s-triazine, and phenylboric acid can effectively inhibit this reaction, increasing the purity and stability of the material.
Article
Energy & Fuels
Daming Zheng, Tao Zhu, Thierry Pauporte
Summary: The synthesis of Cs(x)FA(1-x)Pbl(3) perovskite photovoltaic layers without methylammonium and bromide, using a coadditives approach with potassium chloride and ammonium chloride additives, results in enhanced crystallinity and stability. The addition of KCl and NH4Cl plays a key role in producing a pure PVK phase and controlling ionic mobility, leading to improved performance in Cs(0.1)FA(0.9)Pbl(3) cells with stabilized power conversion efficiency of 20.02%.
Article
Chemistry, Physical
Vera Cimrova, Mariem Guesmi, Sangwon Eom, Youngjong Kang, Drahomir Vyprachticky
Summary: This study investigates the correlation between solvent properties and the morphology of thin films made of formamidinium lead iodide (FAPbI(3)) perovskites. Different solvents were used for the two-step sequential deposition method and the resulting thin films were characterized. The results show that the solvent type has an impact on the grain and crystallite size of the films. Thin films fabricated with tert-butanol solvent exhibit very large grain size and preferred crystallite orientation. These findings are significant and interesting for various optoelectronic applications.
Article
Chemistry, Multidisciplinary
Mi-Hee Jung
Summary: Research has shown that alloy perovskite solar cells exhibit better structural stability and efficiency, showcasing potential for practical applications.
Article
Chemistry, Physical
Cheng Chen, Tongtong Xuan, Wenhao Bai, Tianliang Zhou, Fan Huang, An Xie, Le Wang, Rong-Jun Xie
Summary: The Sr2+-doped CsPbI3 nanocrystals synthesized in this study exhibit enhanced stability and near-unity photoluminescence quantum yield (PLQY), maintaining high PLQY even after surface ligand removal by a polar solvent. Films prepared with a mixture of EA and octane show high PLQY and excellent stability, leading to red-emitting PeLEDs with a world-record peak external quantum efficiency (EQE) of 17.1%.
Article
Chemistry, Physical
Yingping Fan, Xingtao Wang, Yanfeng Miao, Yixin Zhao
Summary: Metal halide perovskite solar cells have gained significant attention as a promising candidate for future photovoltaics, with various chemicals added during development to enhance performance. However, debates still exist over whether these chemicals act as additives or dopants in the final film. Clarifying the nature of these additives is crucial for designing high-quality perovskite films.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Vedran Kojic, Mario Bohac, Arijeta Bafti, Luka Pavic, Kresimir Salamon, Tihana Cizmar, Davor Gracin, Krunoslav Juraic, Mirela Leskovac, Ivana Capan, Andreja Gajovic
Summary: This paper investigated the influence of PVP stabilization additive on the optical and electrical properties of FAPI polycrystalline thin films on ZNR, demonstrating that PVP improves stability, electrical conductivity, and radiative recombination of the photogenerated charge carriers. The results show promising potential for PVP-stabilized FAPI perovskites in next-generation photovoltaic devices.
Article
Energy & Fuels
Liqiang Chen, Jihuai Wu, Guodong Li, Shibo Wang, Chunyan Wang, Sijia Zhu, Xia Chen, Lina Tan, Yitian Du, Weihai Sun, Zhang Lan
Summary: By introducing cesium acetate (CsAc) into the precursor, the performance and stability of perovskite solar cells are improved, resulting in a higher power conversion efficiency and reduced defect density.
Article
Chemistry, Multidisciplinary
Diwei Zhang, Huidong Zhang, Huanxin Guo, Fangyuan Ye, Shuaijun Liu, Yongzhen Wu
Summary: The deposition of FAPbI(3) films assisted by methylamine chloride shows promising photovoltaic performance in inverted-structured solar cells. The addition of excess PbI2 effectively reduces charge trap densities and prolongs carrier lifetimes. By optimization, a remarkable power conversion efficiency of 22.13% has been achieved, with excellent long-term stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Siyang Wang, Liguo Tan, Junjie Zhou, Minghao Li, Xing Zhao, Hang Li, Wolfgang Tress, Liming Ding, Michael Graetzel, Chenyi Yi
Summary: In this study, CsFA films with high quality were fabricated using innovative morphology engineering method, which combines solution deposition and vacuum evaporation. The CsFA-based perovskite solar cells demonstrated excellent thermal stability and high power conversion efficiency, making them a promising candidate for applications in solar energy conversion.
Article
Physics, Multidisciplinary
Yu Zhan, Weijie Chen, Fu Yang, Yaowen Li
Summary: It was found that the addition of cesium chloride additive helps to address the issue of poor aging stability in FAPbI(3) perovskite solution, even forming high-quality pure alpha-FAPbI(3) perovskite film when the solution is aged over one month. This indicates the importance of developing a non-MACl FAPbI(3) perovskite precursor solution for cost-effective preparation of pero-SCs.
Article
Chemistry, Physical
Tasnim Ahmed, Apurba De, Sumanta Paul, Anunay Samanta
Summary: By employing a combination of techniques, this study reveals individual particle-level understanding of charge carrier recombination pathways and dynamics in Bi-doped CsPbBr3 nanocrystals. The results show the heterogeneity of the system in terms of photoluminescence brightness/ efficiency of the individual nanocrystals in doped samples, with bright, dim, and dark types identified. The weak photoluminescence of the doped systems is mainly attributed to an ultrafast trapping process that turns a majority of the Bi-doped nanocrystals into dark ones.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
James Cassidy, Benjamin T. Diroll, Navendu Mondal, David B. Berkinsky, Kehui Zhao, Dulanjan Harankahage, Dmitry Porotnikov, Reagan Gately, Dmitriy Khon, Andrew Proppe, Moungi G. Bawendi, Richard D. Schaller, Anton Malko, Mikhail Zamkov
Summary: The study shows that semiconductor quantum shells with an inverted geometry can inhibit Auger recombination in quantum dots and improve their multiexciton characteristics. By promoting spatial separation between multiple excitons and inducing exciton-exciton repulsion, quantum shells can achieve ultralong lifetimes and high quantum yields, making them attractive for optically and electrically pumped gain media.
Article
Chemistry, Multidisciplinary
Rajesh Kumar Gautam, Somnath Das, Anunay Samanta
Summary: The treatment of blue-emitting, cyan-emitting, and green-emitting perovskite nanocrystals improves their photoluminescence quantum yield and stability, making them suitable for various lighting and display applications.
Article
Chemistry, Multidisciplinary
Navendu Mondal, Nurul Azam, Yuri N. Gartstein, Masoud Mahjouri-Samani, Anton Malko
Summary: In this research, strain-induced modifications of optical properties and their impact on exciton dynamics in single-crystalline 2D transition metal dichalcogenides (TMDs) were studied through transient optical absorption. The study found significant spectral redshifts and dramatic slowing down of exciton dynamics in TMD monolayers grown under strain conditions, contrasting with their freestanding form and traditionally grown TMDs. These findings provide key insights into the influence of growth conditions on optical excitations and promote emerging optoelectronic applications of monolayer TMDs.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Tasnim Ahmed, Sumanta Paul, Anunay Samanta
Summary: Lead halide perovskites are crucial for solar photovoltaic applications, and understanding the hole transfer process is essential for their performance. This study investigates the influence of hole transfer from FAPbBr(3) to phenothiazine on the photoluminescence blinking dynamics of nanocrystals. The results reveal the heterogeneous nature of the hole transfer dynamics and the formation of a short-lived charge-separated state.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
Summary: In this study, stable and highly luminescent CsPbI3 nanocrystals were successfully obtained by modifying the conventional hot-injection method with NH4I as an additional precursor. The excellent characteristics of these nanocrystals, such as the suppression of photoluminescence blinking, could be attributed to the replacement of surface Cs+ with NH4+ ions. These CsPbI3 nanocrystals show great potential for optoelectronic and solar photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Tong Wang, Thomas R. Hopper, Navendu Mondal, Sihui Liu, Chengning Yao, Xijia Zheng, Felice Torrisi, Artem A. Bakulin
Summary: Transition metal dichalcogenides (TMDs) have excellent semiconductor properties, making them promising materials for next-generation optoelectronic and electronic devices. Recent studies have reported the ultrafast carrier cooling rate in TMDs and the slowing effect by hot-phonon bottleneck (HPB) at high excitation densities. However, quantitative descriptions of HPB in TMDs and the effects of carrier-carrier interactions on cooling are still lacking. In this study, using femtosecond pump-push-probe spectroscopy, the scattering of hot carriers with optical phonons, cold carriers, and defects in a benchmark TMD monolayer of polycrystalline WS2 is systematically characterized.
Article
Chemistry, Multidisciplinary
Ben P. Carwithen, Thomas R. Hopper, Ziyuan Ge, Navendu Mondal, Tong Wang, Rozana Mazlumian, Xijia Zheng, Franziska Krieg, Federico Montanarella, Georgian Nedelcu, Martin Kroll, Miguel Albaladejo Siguan, Jarvist M. Frost, Karl Leo, Yana Vaynzof, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Artem A. Bakulin
Summary: In this study, the relaxation of hot carriers in lead halide perovskites (LHPs) and the role of quantum confinement in nanosystems were examined. Ultrafast pump-push-probe spectroscopy was used to study carrier cooling in different size-controlled LHP nanomaterials. The results showed that dimensional confinement has a significant impact on carrier-phonon and carrier-carrier interactions, highlighting its potential for engineering LHP optoelectronic materials.
Article
Chemistry, Physical
Sumanta Paul, Gautam Kishore, Anunay Samanta
Summary: In this study, the photoluminescence blinking phenomenon of quantum confined CsPbBr3 nanocrystals with different sizes was investigated. The recombination pathways and dynamics of the photogenerated charge carriers were analyzed in both immobilized and fluid conditions. The results showed that smaller nanocrystals had a higher carrier trapping rate and a more difficult detrapping process. These findings provide valuable information for designing photoluminescent samples of CsPbBr3 nanocrystals for optoelectronic applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Somnath Das, Modasser Hossain, Anunay Samanta
Summary: A direct method of obtaining CsPbCl3 NCs with exceptional characteristics is reported using diphenylphosphoryl chloride as an efficient chloride precursor and preventing protonation of the amine ligand. High PLQY and remarkable stability of these NCs are attributed to the strong L-type coordination of the unprotonated amine ligand with Pb2+ on the surface. Using these NCs as emitting materials, a high-performance violet LED with ultrapure PL at 410 nm and narrow bandwidth is achieved.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ramavath Babu, Anunay Samanta, Seelam Prasanthkumar, Lakshminarayana Polavarapu
Summary: In this study, hybrid Mn(II) halide (Cl, Br, and I) single crystals with near-unity photoluminescence quantum yield (PLQY) were prepared using the organic cation DMAPH and controlled Zn2+ doping/alloying. The PLQY of these crystals was stable for more than 60 days and could be improved by selective organic cations and doping/alloying strategies.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ben P. Carwithen, Thomas R. Hopper, Ziyuan Ge, Navendu Mondal, Tong Wang, Rozana Mazlumian, Xijia Zheng, Franziska Krieg, Federico Montanarella, Georgian Nedelcu, Martin Kroll, Miguel Albaladejo Siguan, Jarvist M. Frost, Karl Leo, Yana Vaynzof, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Artem A. Bakulin
Summary: This study investigates the carrier cooling process in size-controlled lead halide perovskite nanomaterials using ultrafast pump-push-probe spectroscopy. The results show that there is only a weak size effect on the cooling dynamics in cuboidal nanocrystals, while the hot phonon bottleneck effect commonly observed in bulk perovskites is suppressed in two-dimensional systems.
Article
Chemistry, Multidisciplinary
Tong Wang, Thomas R. Hopper, Navendu Mondal, Sihui Liu, Chengning Yao, Xijia Zheng, Felice Torrisi, Artem A. Bakulin
Summary: Transition metal dichalcogenides (TMDs) have potential applications in next-generation optoelectronic and electronic devices due to their outstanding semiconducting properties. However, there is still a lack of detailed understanding of the carrier cooling mechanisms in TMDs.
Article
Chemistry, Multidisciplinary
Somnath Das, Anunay Samanta
Summary: Direct synthesis of high-quality APbCl(3) and APbBr(3) nanocrystals has been achieved using the chloro- and bromo-analog of DIDMH, providing a generic approach for the synthesis of all APbX(3) nanocrystals. These nanocrystals exhibit excellent stability, high photoluminescence quantum yields, and remarkable performance under various conditions.
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
Summary: By adding NH4I as a precursor, stable and highly luminescent CsPbI3 nanocrystals were successfully synthesized in this study, with significantly suppressed PL blinking. These CsPbI3 nanocrystals can be used as promising materials for single-photon emitters and optoelectronic and solar photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
