Article
Chemistry, Physical
Yenal Yalcinkaya, Ilka M. Hermes, Tobias Seewald, Katrin Amann-Winkel, Lothar Veith, Lukas Schmidt-Mende, Stefan A. L. Weber
Summary: This study introduces a new chemical method to control the strain in perovskite crystals by adjusting the ratio of Pb(Ac)(2) and PbCl2 in the precursor solution. The combination of piezoresponse force microscopy and X-ray diffraction is used to observe the effect on crystal strain. The results demonstrate the potential of chemical strain engineering as a simple method for controlling strain-related effects in lead halide perovskites.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Meng Wang, Jiayu You, Cunyun Xu, Jun Dong, Chuanyao Luo, Qunliang Song, Sam Zhang
Summary: The article introduces a simple method to improve the performance of Q-2D perovskite solar cells by adding 3D perovskite powder to the precursor solution. This enables the formation of a uniform and closely connected heterostructure with distributed large-n phases, thereby promoting charge transfer.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Rui Guo, Biplav Dahal, Arun Thapa, Yuba Raj Poudel, Yunyan Liu, Wenzhi Li
Summary: Organic-inorganic hybrid perovskites have gained significant attention for their exceptional optoelectronic properties, with perovskite solar cells (PSCs) experiencing a substantial leap in efficiency over the past decade. The use of methylamine (MA)-gas-mediated approach for preparing precursor solutions in depositing large scale perovskite films has shown improved crystal structure and efficiency in PSC devices compared to traditional methods. The high-quality MAPbI(3) films prepared using MA-gas-mediated precursor demonstrated larger crystal grains, lower surface roughness, and higher efficiency in planar PSC devices.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Physical
Nikita A. Emelianov, Victoria V. Ozerova, Ivan S. Zhidkov, Denis Korchagin, Gennady Shilov, Alexey L. Litvinov, Ernst Z. Kurmaev, Lyubov A. Frolova, Sergey M. Aldoshin, Pavel A. Troshin
Summary: In this study, nanoscale visualization of the photochemical degradation dynamics of MAPbI3 was achieved using infrared scattering scanning near-field microscopy combined with complementary analytical techniques. The results showed that light exposure led to a gradual loss of MA+ cations in MAPbI3 films, resulting in the formation of a PbI2 skin with enhanced photoluminescence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Sudipta Seth, Eduard A. Podshivaylov, Jun Li, Marina Gerhard, Alexander Kiligaridis, Pavel A. Frantsuzov, Ivan G. Scheblykin
Summary: The study reveals the existence of a maximum timescale in the multiscale blinking behavior of nanoparticles, which is inherent to the material and independent of polycrystallinity. Furthermore, it is suggested that the viscoelasticity of metal-halide perovskites may limit the maximum timescale for photoluminescence fluctuations by restricting the memory of previous crystal lattice deformations/re-arrangements.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Pelayo Marin-Villa, Ana Arauzo, Kacper Druzbicki, Felix Fernandez-Alonso
Summary: This study investigates the microscopic picture and disorder present in the ordered phase of the hybrid perovskite MAPbI(3) using specific-heat data, high-resolution inelastic neutron scattering, and ab initio modeling. The research reveals a substantial lowering of local symmetry around the organic moiety and links the observed thermophysical anomalies to excitations of sub-terahertz optical phonons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Rhys M. Kennard, Clayton J. Dahlman, Ryan A. DeCrescent, Jon A. Schuller, Kunal Mukherjee, Ram Seshadri, Michael L. Chabinyc
Summary: Mechanical strain can modify the structural and electronic properties of methylammonium lead iodide MAPbI(3). The presence of specific twin domains is found to correlate to previously reported strain and defect heterogeneity in MAPbI(3) films. Long-term stability testing reveals that the domain walls are highly immobile over extended periods and nucleation of new domain walls occurs for specific mechanical strains.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Rui Wang, Jingjing Xue, Xihan Chen, Canglang Yao, Zhao-Kui Wang, Marc H. Weber, Aaron H. Rose, Selbi Nuryyeva, Jiahui Zhu, Tianyi Huang, Yepin Zhao, Shaun Tan, Matthew C. Beard, Yanfa Yan, Kai Zhu, Yang Yang
Summary: Efficient perovskite optoelectronic devices utilize effective surface passivation strategies to regulate device performance, with recent studies showing that surface states play a crucial role. In mixed-cation perovskite films, a nonuniform distribution of cations leads to unique surface defect energetics, with FA cations near the top and MA cations near the bottom. By studying the surface defects, it was found that antisite FA(I) acts as a dominant deep trap, resulting in a low surface recombination velocity of 20 cm/s in FA-based perovskite photovoltaic devices.
Article
Nanoscience & Nanotechnology
Chaoran Chen, Jinlong Hu, Zhenhua Xu, Zhen Wang, Yousheng Wang, Lingxiang Zeng, Xianhu Liu, Yang Li, Yaohua Mai, Fei Guo
Summary: Using methionine as a passivation agent can significantly reduce trap-state density in perovskite films, improving carrier lifetime and enhancing the optoelectronic properties of solar cells. Solar cells made of methionine-mediated perovskite films exhibit higher photovoltage and improved stability compared to control devices.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xiaolong Zhang, Hongli Suo, Zili Zhang, Shuai Ye, Lin Ma, Min Liu, Yaotang Ji, Xufeng Wang, Kausar Shaheen, Lei Wang, Qiuliang Wang
Summary: Doping of nanoparticles is an effective method to improve the performance of nanocomposite thin films. This study utilized 2D-XRD technique to investigate the orientation and phase evolution of BYNO doped particles in YBCO. It was found that the BYNO particles near the LAO substrate had the same orientation, while the rest of the particles had random orientation. The higher random orientation of BYNO particles contributed to the improved superconducting properties of the thin films. A nucleation and growth model for the BYNO-doped YBCO nanocomposite film was established.
Article
Optics
Pilik Basumatary, Juhi Kumari, Pratima Agarwal
Summary: The luminescence properties of MAPbI3 perovskite thin films deposited on corning 1737 glass substrates were studied using PL and PLE spectroscopy. Two emission peaks were observed in the bandgap region, with one attributed to shallow trap states and the other corresponding to the bandgap of MAPbI3.
Article
Physics, Applied
Rohit Saraf, Cecile Saguy, Vivek Maheshwari, Hemaprabha Elangovan, Yachin Ivry
Summary: This study demonstrates that intrinsic polarization conductivity governs photoconductivity in hybrid halide perovskite films, with directional photocurrent flow along the long crystallographic axis and suppression at the tetragonal-to-cubic transformation. Nonvolatile memory behavior of polarization domains leads to photoconductive memristive behavior. Understanding the origin of photoelectric activity in HHPs allows for designing devices with enhanced functionality.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Peng Zeng, Qinghong Zhang, Yifeng Zhang, Bing Cai, Guanqun Feng, Yixiao Wang, Chengsong Zeng, Wen-Hua Zhang, Mingzhen Liu
Summary: Surface defect passivation through additional molecular bonding is crucial for the optimization of perovskite-based photovoltaic devices. The coverage possibility of surface defect sites of perovskite films by added molecules has been unraveled. The Langmuir adsorption relationship of defect site coverage with the amount of passivation molecules has been revealed.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Bipanko Kumar Mondal, Md. Ferdous Rahman, Jaker Hossain
Summary: We report the nonlinear optical properties of solution-processed indium selenide thin films. The films undergo a phase transformation from beta-In3Se2 to gamma-In2Se3 due to mechanical stress during annealing. Both phases show potential for nonlinear optical applications.
RESULTS IN PHYSICS
(2022)
Article
Physics, Applied
Chen Chen, Dan Wu, Meng Yuan, Chao Yu, Jian Zhang, Chuannan Li, Yu Duan
Summary: CsPbX3 perovskite thin films fabricated by vacuum evaporation require precise optical constants for designing optical devices. Research shows that the three-oscillator model accurately describes the optical constants of CsPbBr3, and time-resolved photoluminescence can accurately predict the electric field intensity distribution and cavity length.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
M. Gruart, N. Feldberg, B. Gayral, C. Bougerol, S. Pouget, E. Bellet-Amalric, N. Garro, A. Cros, H. Okuno, B. Daudin
Article
Chemistry, Multidisciplinary
Praveen Kumar, Christopher L. Berhaut, Diana Zapata Dominguez, Eric De Vito, Samuel Tardif, Stephanie Pouget, Sandrine Lyonnard, Pierre-Henri Jouneau
Article
Chemistry, Multidisciplinary
Jiajiu Ye, Yuze Li, Asma Aicha Medjahed, Stephanie Pouget, Dmitry Aldakov, Yueli Liu, Peter Reiss
Summary: The bilayer ETL consisting of two different doped SnO2 nanoparticle layers improves the open-circuit voltage loss in halide perovskite solar cells, enhances electron transfer efficiency, and reduces carrier recombination processes.
The reduced strain in perovskite layers grown on the bilayer ETL contributes to increased stability and easier preparation of smooth, pinhole-free ETLs.
Additionally, the bilayer SnO2 ETL can be processed at low temperature, showing great potential for use in tandem devices or flexible PSCs.
Article
Chemistry, Physical
Tuan M. Duong, Dmitry Aldakov, Stephanie Pouget, Wai Li Ling, Le Si Dang, Gilles Nogues, Peter Reiss
Summary: This study presents a simple method for tuning the emission wavelength of CsPbBr3 nanocrystals by post-synthetic doping with aluminum. By increasing the Al/Pb feed ratio, different doping levels were achieved. Introduction of Al3+ led to a hypsochromic shift of the photoluminescence emission and the peak position was stable and tunable.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Asma A. Medjahed, Tao Zhou, Juan Camilo Alvarez Quiceno, Pia Dally, Pascal Pochet, Tobias U. Schulli, David Djurado, Peter Reiss, Stephanie Pouget
Summary: This study investigates the mechanisms of strain and texture observed in MAPbI(3) thin films deposited on various oxide substrates. The results show that the strain of the perovskite layers is essentially relaxed behavior, contradicting the commonly accepted hypothesis. The texture in the perovskite layers is studied using synchrotron full-field diffraction X-ray microscopy, and the stability of different orientations is analyzed by DFT calculations.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Yuze Li, Jia-Jiu Ye, Asma Medjahed, Dmitry Aldakov, Stephanie Pouget, Elisabeth Djurado, Lin Xu, Peter Reiss
Summary: Nickel oxide (NiOx) is a promising hole transport layer (HTL) material in halide perovskite solar cells (PSCs) due to its high hole mobility, transparency, and stability. However, the inefficient hole extraction caused by contact problems between NiOx and the perovskite layer limits the device performance. In this study, we used 4-dimethylaminopyridine (DMAP) as a molecular passivation agent for the HTL to improve the band alignment at the NiOx/perovskite interface. This resulted in reduced carrier recombination, improved hole transfer, and enhanced device efficiency and stability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Chemical
M. Coudray, E. Billy, S. Pouget, P. -h. Haumesser, C. C. Santini, V. Dufaud, H. Mendil-Jakani
Summary: This study presents a safer and greener process for recovering Pt catalyst from membrane electrode assemblies (MEAs) without the need for calcination and dissolution of Pt nanoparticles. Ionic liquids (ILs) are used as extractants to directly recover Pt nanoparticles from MEA catalyst layers and as stabilizing agents. The optimized process achieves the extraction of metallic Pt up to >90% of the initial amount and enables the detachment of Pt nanoparticles from the carbon support in a single step.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Katarzyna Krukiewicz, Dominika Czerwinska-Glowka, Roman Maria Turczyn, Agata Blacha-Grzechnik, Catalina Vallejo-Giraldo, Karol Erfurt, Anna Chrobok, Jerome Faure-Vincent, Stephanie Pouget, David Djurado, Manus J. P. Biggs
Summary: Electrical stimulation has been successfully used for the treatment of neurodegenerative disorders, and recent research has shown that combining it with optical stimulation can further enhance neural modulation. This study introduces an electrochemically modified, nanostructured ITO/PET electrode material that is flexible, transparent, and cytocompatible, and demonstrates its ability to enhance neural cell survival and neurite outgrowth.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Olivier Bardagot, Yann Kervella, Asma Aicha Medjahed, Stephanie Pouget, Tamara Nunes Domschke, Alexandre Carella, Cyril Aumaitre, Patrick Leveque, Renaud Demadrille
Summary: The synthesis of two n-type semiconducting polymers containing NDI monomer and thiophene spacers is reported. The introduction of a BTD moiety in the polymer backbone improves charge transport, doping efficiency, conductivity, and stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Natacha Huynh, Joao Paulo Cosas Fernandes, Vincent H. Mareau, Laurent Gonon, Stephanie Pouget, Pierre-Henri Jouneau, Lionel Porcar, Hakima Mendil-Jakani
Summary: The study presented the elaboration and functional properties of a new generation of hybrid membranes for PEMFC applications, revealing the structure and performance of the new material through characterization methods. The SG phase mainly grows in the amorphous interbundle domains, with limited impact on the ion channels but leading to discontinuity in ion conductivity.
NANOSCALE ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
Amelie Schultheiss, Alexandre Carella, Stephanie Pouget, Jerome Faure-Vincent, Renaud Demadrille, Amelie Revaux, Jean-Pierre Simonato
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Article
Materials Science, Multidisciplinary
Amelie Schultheiss, Magatte Gueye, Alexandre Carella, Anass Benayad, Stephanie Pouget, Jerome Faure-Vincent, Renaud Demadrille, Amelie Revaux, Jean-Pierre Simonato
ACS APPLIED POLYMER MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Etienne Yvenou, Martina Sandroni, Alexandre Carella, Magatte N. Gueye, Jerome Faure-Vincent, Stephanie Pouget, Renaud Demadrille, Jean-Pierre Simonato
MATERIALS CHEMISTRY FRONTIERS
(2020)