Article
Chemistry, Multidisciplinary
Zhaojian Xu, Ross A. Kerner, Joseph J. Berry, Barry P. Rand
Summary: Due to their straightforward stoichiometry-bandgap tunability, mixed-halide perovskites are ideal for many optoelectronic devices. However, unwanted halide segregation under operational conditions restricts practical use, and the origin of voltage-induced halide segregation is still unclear.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Adam D. Wright, Jay. B. Patel, Michael B. Johnston, Laura M. Herz
Summary: Understanding the mechanism of light-induced halide segregation is important for using mixed-halide perovskites in multijunction solar cells. Photoluminescence spectroscopy reveals that increasing temperature and light intensity can counteract halide segregation. The acceleration and deceleration of halide segregation with temperature are attributed to the trade-off between temperature activation and entropic factors. High light intensities can also reverse halide segregation, but only temporarily. These findings contribute to a better understanding of halide segregation and the development of efficient and stable perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sascha Feldmann, Timo Neumann, Richard Ciesielski, Richard H. Friend, Achim Hartschuh, Felix Deschler
Summary: Halide perovskites are high-performance semiconductors for optoelectronic devices, with their bandgap tunability using mixtures of different halide ions. The study combines temperature-dependent photoluminescence microscopy with computational modeling to quantify the impact of local bandgap variations on the global photoluminescence yield. Factors such as fabrication temperature, surface energy, and charge recombination constants are key in determining photoluminescence quantum efficiency, and tailored bandgap modulation can further enhance luminescence efficiency. This work provides a new strategy and fabrication guidelines for improving halide perovskite performance in light-emitting and photovoltaic applications.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shaohua Yu, Jin Xu, Xiaoying Shang, En Ma, Fulin Lin, Wei Zheng, Datao Tu, Renfu Li, Xueyuan Chen
Summary: The temperature-dependent bandgap in CsPbBr3 perovskites varies with material dimensionality, showing an initial blueshift followed by a redshift trend in 2D nanoplatelets. This shift is attributed to the larger contribution from electron-optical phonon interaction in nanoplatelets compared to nanocrystals, as indicated by the Bose-Einstein two-oscillator modeling. These findings provide valuable insights into the origin of temperature-dependent bandgap shifts in perovskite semiconductor materials.
Article
Chemistry, Multidisciplinary
Yang Zhou, Simone C. W. van Laar, Daniele Meggiolaro, Luca Gregori, Samuele Martani, Jia-Yong Heng, Kunal Datta, Jesus Jimenez-Lopez, Feng Wang, E. Laine Wong, Isabella Poli, Antonella Treglia, Daniele Cortecchia, Mirko Prato, Libor Kobera, Feng Gao, Ni Zhao, Rene A. J. Janssen, Filippo De Angelis, Annamaria Petrozza
Summary: The bandgap tunability of lead mixed halide perovskites (LMHPs) is crucial for optoelectronic applications. However, the formation of iodide-rich phase under illumination destabilizes the bandgap. This study reveals that the formation of the iodide-rich phase is promoted by the presence of I-2 and the binding strength of Br- within the crystalline unit.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Lethy Krishnan Jagadamma, Paul R. Edwards, Robert W. Martin, Arvydas Ruseckas, Ifor D. W. Samuel
Summary: The nanoscale morphology of solar cell materials significantly affects their performance, with studies showing the presence of multiple length scales of heterogeneity in mixed halide perovskites. These heterogeneities impact the efficiency, hysteresis loss, and degradation of solar cells, highlighting the need for advanced nanoscale characterization to improve device performance and stability.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Alexander J. Knight, Juliane Borchert, Robert D. J. Oliver, Jay B. Patel, Paolo G. Radaelli, Henry J. Snaith, Michael B. Johnston, Laura M. Herz
Summary: Mixed-halide perovskite films of MAPb(Br0.5I0.5)(3) and FA(0.83)Cs(0.17)Pb(Br0.4I0.6)(3) exhibit clear differences in compositional and optoelectronic changes associated with halide segregation. MAPb(Br0.5I0.5)(3) shows low-barrier ionic pathways that enhance stability against halide segregation, while FA(0.83)Cs(0.17)Pb(Br0.4I0.6)(3) lacks such pathways and undergoes considerable ionic rearrangement under prolonged illumination.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Rui Yun, Huanxin Yang, Yue Li, Yuling Liu, Yiyue Chu, Xiaodan Zhang, Libing Zhang, Xiyan Li, Suli Wu, Xiaowang Liu
Summary: A transformation strategy mediated by an inorganic ligand (NOBF4) was developed to obtain blue-emitting CsPbBr3 nanoplates (NPLs). The transformation process involved the dissolution and recrystallization of Cs4PbBr6 nanocrystals in a nonpolar environment, resulting in the formation of pure blue-emitting NPLs with a line width of about 12 nm. The reorganization of organic ligands tuned by NO+ played a crucial role in the formation of NPLs. This work provides an effective strategy for obtaining pure blue-emitting NPLs and offers a platform for exploring the mechanism of anisotropic growth in perovskite crystals.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junsang Cho, Preethi S. Mathew, Jeffrey T. DuBose, Prashant Kamat
Summary: 2D lead halide perovskites with tunable bandgap and enhanced chemical stability are useful for designing optoelectronic devices. Reducing dimensionality can increase resistance to light-induced ion migration, but also decreases the efficiency of halide ion segregation and segregation rate constant, leading to a decrease in charge-carrier lifetime.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Fan Xu, Meng Zhang, Zikun Li, Xiaoyu Yang, Rui Zhu
Summary: Wide-bandgap (WBG) perovskite solar cells (PSCs) are promising candidates for multijunction tandem and building photovoltaics, but their performance still lags behind pure-iodide counterparts due to complex compositional evolution, significant photovoltage deficits, and intrinsic spectral losses. This article comprehensively discusses the drawbacks of WBG PSCs from a device perspective and proposes three critical issues for growing high-quality WBG perovskites. The prospects for future advancements and commercialization of WBG PSCs are also presented to guide upcoming research hotspots.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fuxiang Ji, Feng Wang, Libor Kobera, Sabina Abbrent, Jiri Brus, Weihua Ning, Feng Gao
Summary: This study investigated the atomic-level structure of lead-free halide double perovskite alloys using solid-state nuclear magnetic resonance (ssNMR) techniques, revealing that paramagnetic Fe3+ ions replace diamagnetic In3+ ions in the lattice structure. The formation of [FeCl6](3-)center dot[AgCl6](5-) domains with different sizes and distribution modes was observed in the alloys, providing insights into the bandgap engineering of double perovskites.
Article
Chemistry, Multidisciplinary
Vincent J. Y. Lim, Alexander J. Knight, Robert D. J. Oliver, Henry J. Snaith, Michael B. Johnston, Laura M. Herz
Summary: This study explores the influence of a hole-transport layer in mixed-halide perovskite films on halide segregation. It shows that using a poly(triaryl)amine (PTAA) hole-extraction layer suppresses halide segregation but increases radiative recombination losses. Passivation with a piperidinium salt slows halide segregation, while a PTAA top-coating accelerates this process.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Qi Jiang, Jinhui Tong, Rebecca A. Scheidt, Xiaoming Wang, Amy E. Louks, Yeming Xian, Robert Tirawat, Axel F. Palmstrom, Matthew P. Hautzinger, Steven P. Harvey, Steve Johnston, Laura T. Schelhas, Bryon W. Larson, Emily L. Warren, Matthew C. Beard, Joseph J. Berry, Yanfa Yan, Kai Zhu
Summary: This study demonstrates the development of highly stable and efficient wide-bandgap perovskite solar cells through a combination of rapid bromine crystallization and gentle gas-quenching method. The resulting perovskite films exhibit reduced defect density and enable the realization of high efficiency and operational stability in wide-bandgap perovskite solar cells. Additionally, the integration of narrow-bandgap perovskite solar cells leads to the creation of an all-perovskite, two-terminal tandem device with high open-circuit voltage.
Article
Chemistry, Multidisciplinary
Martin Priessner, Peter A. Summers, Benjamin W. Lewis, Magdalena Sastre, Liming Ying, Marina K. Kuimova, Ramon Vilar
Summary: A new optical probe based on BODIPY has been developed, which exhibits fluorescence intensity switch-on upon binding to copper(I) and can be used to visualize copper(I) pools in lysosomes of live cells.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Eita Nakanishi, Ryosuke Nishikubo, Fumitaka Ishiwari, Tomoya Nakamura, Atsushi Wakamiya, Akinori Saeki
Summary: Connecting data science with experimental methods is critical for accelerating material science research. In this study, a multivariate analysis was used to explore the effects of A-site organic cation mixing in tin iodide perovskite solar cells. Through experimental screening, a new perovskite material with a power conversion efficiency of 7.22% was identified.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jichi Liu, Chongchong Wu, Ian D. Gates, Baohua Jia, Zihang Huang, Tianyi Ma
Summary: Aqueous supercapacitors are considered promising for commercial energy storage devices due to their safety, low cost, and environmental friendliness. However, the challenge of achieving both long electrode lifespan and qualified energy-storage property has hindered their practical application. In this study, an electrode-electrolyte integrated optimization strategy is developed to meet real-life device requirements. By optimizing the nanomorphology and surface chemistry of the tungsten oxide anode, along with the design of a hybrid electrolyte, record-breaking durability and stable operation under extreme conditions are achieved. These results demonstrate the possibility of replacing commercial organic energy storage devices with aqueous counterparts for various daily applications.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Physical
Ming Meng, Liwei Wang, Chunyang Li, Kun Xu, Yuanyuan Chen, Jitao Li, Zhixing Gan, Honglei Yuan, Lizhe Liu, Jun Li
Summary: This study demonstrates a new strategy of crystal facet-induced charges separation by constructing In2O3 homojunctions. The built-in electric field from different crystal facets enables the accumulation of electrons and holes on different surfaces, achieving efficient charges separation and enhancing the photoelectrochemical water splitting activity. This strategy of boosting charges separation can be applied in other optoelectronic devices.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Qiong Sun, Baoning Zhang, Yingchao He, Likun Sun, Peng Hou, Zhixing Gan, Liyan Yu, Lifeng Dong
Summary: In this study, a quantum dot sensitized photocatalyst was designed and applied for the purification of dye wastewater. It utilizes black phosphorus nanoparticles as the quantum dots and an inverse opal TiO2 photonic crystal as the main photocatalyst. The photocatalyst exhibited efficient electronic transmission and reduced interfacial resistance, leading to the promotion of active oxidative species production and photo-induced charge transfer through a type-II route. It achieved excellent photocatalytic properties with high apparent kinetic constant and long-term stability.
APPLIED SURFACE SCIENCE
(2023)
Review
Optics
Yuning Zhang, Jiayang Wu, Linnan Jia, Yang Qu, Yunyi Yang, Baohua Jia, David J. Moss
Summary: Integrated photonic devices operating via optical nonlinearities offer a powerful solution for all-optical information processing, and graphene oxide (GO) has attracted significant attention for its large optical nonlinearity and facile fabrication processes. This paper reviews the applications of GO to nonlinear integrated photonics, including its optical properties, fabrication technologies, and the state-of-the-art GO nonlinear integrated photonic devices. The challenges and future opportunities in this field are also discussed.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Guiyuan Cao, Han Lin, Baohua Jia, Xiaocong Yuan, Michael Somekh, Shibiao Wei
Summary: Traditional OAM generation devices are bulky and limited to creating OAM with one specific topological charge. This study demonstrates a tunable multi-topological charge OAM generator based on an ultrathin integrable graphene metalens. Different topological charges can be designed on different focal planes and dynamically changed by stretching the graphene metalens. This design method paves the way for miniaturization and integration of OAM beam-type photonic devices.
Review
Chemistry, Physical
Mehri Ghasemi, Songyang Yuan, Jiandong Fan, Baohua Jia, Xiaoming Wen
Summary: Metal halide perovskites (MHPs) have attracted attention due to their remarkable properties, but grain boundaries in polycrystalline thin-films (TFs) limit their performance. MHP single crystals (SCs) with fewer or no grains are promising for superior optoelectronic applications. However, research on MHP SC solar cells lags behind TF solar cells. This review sets guidelines for the development of MHP SC solar cells and discusses the challenges, harmful impacts, and strategies to improve their performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Physics, Applied
Ying Wang, Qingfeng Gui, Peng Wang, Wei Guan, Xingchen Dong, Haoyu Wang, Hongzhou Dong, Lina Sui, Zhixing Gan, Lifeng Dong, Liyan Yu
Summary: Despite extensive efforts, there is still a high demand for lead-free, low toxicity, efficient, and stable blue fluorescent materials. Cs2NaInCl6 double perovskite (DP) is considered a promising candidate for solid-state lighting due to its low toxicity and good stability. Here, Mg-doped Cs2NaInCl6 DPs were prepared using a solvothermal method. The Mg2+-doped Cs2NaInCl6 DPs showed independent blue photoluminescence (PL) at 445 nm with a large Stokes shift (129.5 nm), long PL lifetime (10.44 μs), and a huge Huang-Rhys factor (40.2), indicating the presence of self-trapped excitons. After optimizing the reaction conditions and doping concentration, a high photoluminescence quantum yield of 86.98% was achieved. Moreover, the Mg-doped Cs2NaInCl6 DPs exhibited excellent resistance to irradiation and moisture, which can address the limitations of current blue emitting materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Ge Yan, Xiaodong Sun, Yu Zhang, Hui Li, Hongwei Huang, Baohua Jia, Dawei Su, Tianyi Ma
Summary: A novel metal-free 2D/2D van der Waals heterojunction was successfully constructed by integrating a two-dimensional COF with ketoenamine linkage and defective hexagonal boron nitride. The presence of VDW heterojunction and introduced defects facilitated charge carriers separation and provided more reactive sites. The resulting heterojunction exhibited excellent solar energy catalytic activity for water splitting, surpassing the performance of pristine COF and other metal-free-based photocatalysts reported to date.
NANO-MICRO LETTERS
(2023)
Article
Thermodynamics
Miao Liu, Wenjing Ning, Junbo Yang, Yuankun Zhang, Zhuosheng Han, Ge Meng, Chunsheng Guo, Han Lin, Baohua Jia
Summary: This study proposes a novel composite pore former comprising NaCl and g-C3N4 for fabricating high-performance multi-morphology porous wicks. The synergistic effect of these pores increases the wicks' porosity and reduces flow resistance, enabling them to exhibit high comprehensive performance. The wicks also have ultralow thermal resistance and exceptional anti-gravity performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Ming Meng, Lun Yang, Jing Yang, Yu Zhu, Chunyang Li, Hongjun Xia, Honglei Yuan, Meng Zhang, You Zhao, Fengshou Tian, Jitao Li, Kuili Liu, Lei Wang, Zhixing Gan
Summary: This study presents an innovative two-dimensional lateral anatase-rutile TiO2 phase junctions with controllable oxygen vacancies on Ti mesh. The junctions exhibit high-efficiency charge separation and enriching active sites, while the interfacial oxygen vacancies extend visible light response and accelerate the separation and transfer of charges. The optimized photoelectrode shows significantly enhanced photocurrent density and incident photon to current conversion efficiency. This research provides new insights for developing novel 2D lateral phase junctions for photoelectrochemical applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Wei Zhang, Wentao Li, Qiaoling Wu, Qin Zhao, Xiaojun He, Daliang Liu, Baohua Jia, Jieshan Qiu, Tianyi Ma, Ying Sun
Summary: In this work, a novel bismuth molybdate nanocatalyst with sufficient oxygen vacancies and high Bi concentration is synthesized, and it is demonstrated to be an excellent electrocatalyst for N-2 electroreduction reaction (NRR). The as-synthesized BiMoO-OVs shows a high Faradaic efficiency of 16.38% and a NH3 yield rate of 3.65 μg h(-1) cm(-2) at -0.4 V (vs RHE) in neutral electrolyte, outperforming most Bi-based NRR nanocatalysts. Importantly, it also exhibits excellent electrochemical durability for at least 24 hours. This work provides a simple and effective strategy for designing low-cost and high-performance Bi-based catalysts.
ADVANCED MATERIALS INTERFACES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Yang Qu, Yunyi Yang, Jiayang Wu, Yuning Zhang, Linnan Jia, Houssein El Dirani, Romain Crochemore, Corrado Sciancalepore, Pierre Demongodin, Christian Grillet, Christelle Monat, Baohua Jia, David J. Moss
Summary: The power-sensitive photo-thermal tuning (PTT) behavior of graphene oxide (GO) integrated on the top surface of silicon nitride (SiN) waveguides is experimentally investigated. The thresholds for reversible and permanent GO reduction are measured for SiN waveguide coating with monolayer GO. Three reduction stages are identified based on the reversibility of the reduction process. The study confirms that the PTT is primarily determined by the average input power, regardless of the type of laser used.
INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XXVII
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Yuning Zhang, Jiayang Wu, Yunyi Yang, Yang Qu, Linnan Jia, Houssein El Dirani, Romain Crochemore, Corrado Sciancalepore, Pierre Demongodin, Christian Grillet, Christelle Monat, Baohua Jia, David Moss
Summary: Graphene oxide (GO) films integrated on silicon nitride (Si3N4) waveguides through a solution-based method enhance the spectral broadening and self-phase modulation (SPM) effect. The GO-coated waveguides show significantly improved nonlinear performance compared to the uncoated waveguide, resulting in a broadening factor of up to 3.4 and an improvement in the waveguide nonlinear parameter by a factor of up to 18.4. The high Kerr nonlinearity of GO contributes to the enhancement of SPM in Si3N4 waveguides.
INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XXVII
(2023)
Article
Chemistry, Multidisciplinary
Lihao Zhang, Yufei Chen, Yue Cao, Sunlong Li, Weipeng Lu, Wei Cao, Jialiang Zhu, Weiting Bao, Ming Shao, Zhixing Gan, Yunsong Di, Fangjian Xing, Xiang Li, Liang Zhang, Cihui Liu
Summary: Increasing attention has been given to superwettability and its potential applications. A new approach has been proposed for flexible, self-assembled superhydrophobic surfaces using photonic crystal films. The resulting hierarchical film offers a promising solution for creating durable and flexible superhydrophobic surfaces on various substrates.
Article
Optics
Yangyu Liu, Luyao Li, Xiaozhao Song, Wei Zhou, Qiang Zhu, Guangmiao Liu, Xiaodong Xu, Haotian Wang, Xue Cao, Yishan W. Ang, Baohua Jia, Deyuan Shen
Summary: In this study, we generated cylindrical vector pulsed beams by using a c-cut Tm:CaYAlO4 crystal and SESAM in a folded six-mirror cavity. By adjusting the distance between the curved cavity mirror (M4) and the SESAM, both radially polarized beam and azimuthally polarized beam were generated around 1962 nm and the two vectorial modes could be freely switched in the resonator. When the pump power was increased to 7 W, stable radially polarized Q-switched mode-locked (QML) cylindrical vector beams were obtained with an output power of 55 mW, sub-pulse repetition rate of 120.42 MHz, pulse duration of -0.5 ns, and the beam quality factor M2 of -2.9. To our knowledge, this is the first report of radially and azimuthally polarized beams in the 2 μm wavelength solid-state resonator.