Article
Multidisciplinary Sciences
Li Na Quan, Yoonjae Park, Peijun Guo, Mengyu Gao, Jianbo Jin, Jianmei Huang, Jason K. Copper, Adam Schwartzberg, Richard Schaller, David T. Limmer, Peidong Yang
Summary: Organic-inorganic layered perovskites exhibit excitonic excitations with substantial binding energies due to dielectric confinement and ionic sublattice. The ligand environment in these materials significantly alters their optical properties, with vibrational relaxation affected by the type of organic barriers used. Molecular dynamics simulations explain the fast rates of relaxation and temperature independence observed in these layered perovskites.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Nanoscience & Nanotechnology
Hao Gu, Junmin Xia, Chao Liang, Yonghua Chen, Wei Huang, Guichuan Xing
Summary: This Perspective article investigates the advances in achieving phase-pure perovskite by manipulating precursor interactions and preparation methods, and discusses their prominent optoelectronic properties and applications. Compared to two-dimensional metal-halide perovskites with multiple quantum wells, the ones with phase-pure quantum wells have a flattened energy landscape, resulting in reduced energy or charge-transfer losses and increased stability.
NATURE REVIEWS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lu Zhang, Bobo Yang, Shiliang Mei, Yuxuan Zhu, Rongrong Hu, Jun Zou
Summary: Lead-based perovskites have remarkable photophysical characteristics, but their commercial application is limited by the presence of lead. In this study, a lead-free ODASnBr(4) phosphor with excellent emission properties was prepared and used in the fabrication of white light-emitting devices (WLEDs) for tunable correlated color temperature. This demonstrates the potential of ODASnBr(4) as a strongly emitting and environmentally friendly phosphor material for WLED applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Chun Zhou, Joao M. Pina, Tong Zhu, Darshan H. Parmar, Hao Chang, Jie Yu, Fanglong Yuan, Golam Bappi, Yi Hou, Xiaopeng Zheng, Jehad Abed, Hao Chen, Jian Zhang, Yuan Gao, Bin Chen, Ya-Kun Wang, Haijie Chen, Tianju Zhang, Sjoerd Hoogland, Makhsud Saidaminov, Liaoxin Sun, Osman M. Bakr, Hongxing Dong, Long Zhang, Edward H. Sargent
Summary: In this study, Perovskite quantum dots superlattices were successfully self-assembled with the assistance of sodium as assembly director, forming ordered three-dimensional structures with increased attraction and decreased inter-dot distance. These structures facilitate exciton delocalization and sustained nanosecond lasing operation with a threshold of 25 mu J cm(-2).
Article
Materials Science, Multidisciplinary
Haihua Zhang, Jiannian Yao, Hongbing Fu
Summary: Atomically thin monolayer Mn2+-alloyed 2D Ruddlesden-Popper perovskite colloidal quantum wells show efficient tunable emitter with wide color gamut. By precisely controlling the chemical compositions, dual color emissions and single-component white emitter with high PLQY are achieved, demonstrating great potential for next generation lighting and display technologies.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Yuchen Dai, Pengfei Qi, Guangyi Tao, Guangjie Yao, Beibei Shi, Zhixin Liu, Zhengchang Liu, Xiao He, Pu Peng, Zhibo Dang, Liheng Zheng, Tianhao Zhang, Yongji Gong, Yan Guan, Kaihui Liu, Zheyu Fang
Summary: This letter investigates phonon-assisted photon upconversion (UPC) in twisted 2D semiconductors, where an inverted contrast between UPC and conventional photoluminescence (PL) of WSe2 twisted bilayer emerges. A 4-fold UPC enhancement is achieved in the 5.5 degrees twisted bilayer while PL weakens by half. The rotation-angle-dependent UPC enhancement is attributed to reduced interlayer exciton conversion efficiency driven by lattice relaxation and enhanced pump efficiency resulting from spectral redshift. This counterintuitive phenomenon provides a novel insight into the effect of twisted angle on UPC and light-matter interactions in 2D semiconductors. Furthermore, the UPC enhancement platform with various superimposable means offers an effective method for lighting bilayers and expanding the application prospect of 2D stacked van der Waals devices.
LIGHT-SCIENCE & APPLICATIONS
(2023)
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
Materials Science, Multidisciplinary
Zhongyuan Li, Bin Li, Wuqi Liu, Dong Yan, Qiang Tang, Zhen Fang, Rong-Jun Xie
Summary: In this study, an Mn2+-doped two-dimensional (2D) layered HDP material PPA(4)NaInCl(8) was reported, which showed promising photoluminescence properties with efficient red emission. The energy transfer process between the inserted organic cations PPA(+) and Mn2+ was investigated, resulting in tunable emission with varying Mn2+ concentration. These findings provide important insights into doping and doped 2D layered HDPs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
E. Kirichenko, V. A. Stephanovich
Summary: The study found that the synergy between screening and disorder can either destroy excitons or promote the creation of bound states, with energy level crossings occurring at certain discrete values of the screening radius. These effects may be related to quantum manifestations of chaotic exciton behavior in 2D semiconductor structures.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Alexander Steinhoff, Frank Jahnke, Matthias Florian
Summary: A novel many-body theory of EEA based on first-principle band structures and Coulomb interaction matrix elements is presented, going beyond an effective bosonic picture. Applying the theory to monolayer MoS2 encapsulated in hexagonal BN, an EEA coefficient of the order of 10(-3) cm(2) s(-1) at room temperature is obtained, indicating that carrier losses are often dominated by other processes like defect-assisted scattering. The study provides a perspective to quantify the efficiency of intrinsic EEA processes in various 2D materials in modern materials research.
Article
Engineering, Electrical & Electronic
Zema Chu, Wei Zhang, Ji Jiang, Zihan Qu, Fei Ma, Yang Zhao, Xinbo Chu, Yunxiu Shen, Yaowen Li, Zhigang Yin, Xingwang Zhang, Jingbi You
Summary: The addition of an alkali metal salt (caesium chloride) to a hole injection layer can improve carrier transport and charge injection efficiency in quasi-two-dimensional blue perovskite light-emitting diodes. It also leads to a rearrangement of phase distribution, reducing non-radiative recombinations and enhancing charge transport. By incorporating caesium chloride, sky-blue perovskite light-emitting diodes with an external quantum efficiency of 16.07% and improved operational stability are achieved.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Kang Wang, Linrui Jin, Yao Gao, Aihui Liang, Blake P. Finkenauer, Wenchao Zhao, Zitang Wei, Chenhui Zhu, Tzung-Fang Guo, Libai Huang, Letian Dou
Summary: Researchers have developed an efficient and stable LED device using organic semiconductor barrier layers, which enable the conversion of emission energy from the organic layer into higher energy emission from the perovskite layer, leading to improved device performance and stability.
Article
Chemistry, Physical
Jiajia Chen, Kai Wu, Wei Hu, Jinlong Yang
Summary: Research shows that 2D polar perovskites have large Rashba constants and strong electric field responses, making them suitable for use in spin FETs, enabling a short spin channel length of tens of nanometers to preserve spin coherence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Physical
YunHui L. Lin, Jeffrey L. Blackburn, Matthew C. Beard, Justin C. Johnson
Summary: The emerging class of 2D layered metal-halide perovskites shows important photophysical behavior with potential applications in optoelectronics and photocatalysis. Early studies identified key questions, which recent developments are beginning to address.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Ninghao Zhou, Zhenyu Ouyang, Liang Yan, Meredith G. McNamee, Wei You, Andrew M. Moran
Summary: A study using nonlinear photocurrent spectroscopy technique analyzed quantum wells in layered organohalide perovskite films, revealing that the largest quantum wells are primarily responsible for photocurrent production, while the smallest quantum wells trap charge carriers and are a major source of energy loss in photovoltaic cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Yanfeng Yin, Wenming Tian, Hui Luo, Yuxiang Gao, Tingting Zhao, Chunyi Zhao, Jing Leng, Qi Sun, Jianbo Tang, Peng Wang, Quanjun Li, Xujie Lu, Jiming Bian, Shengye Jin
Summary: The study shows that under high pressure, the carrier transport properties of perovskite materials are significantly enhanced, which helps optimize their optoelectronic performance.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Zhaoxia Yang, Wenming Tian, Fengke Sun, Shengye Jin, Dongjiang You
Summary: In this study, the excitation-power-dependent dual-band emission from self-trapped excitons (STEs) and Mn dopants in 1D Mn-doped DMEDAPbBr(4) single crystals was reported. By changing the excitation intensity, a broad and continuous color tuning range between blue and orange was achieved. The tunable emission color is enabled by the competitive transfers of excitons to the STE state and Mn2+ ions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Qi Sun, Jialong Gong, Xianchang Yan, Yuting Wu, Rongrong Cui, Wenming Tian, Shengye Jin, Yue Wang
Summary: This study reveals the intrinsic carrier dynamics in 2D perovskite quantum wells using CsPbBr3 nanoplates as a model system. A ultrafast and hot-phonon-bottleneck-free carrier cooling is observed in monodisperse CsPbBr3 quantum wells, in contrast to bulk and nanocrystalline perovskites. The absence of hot-phonon-bottleneck is attributed to the efficient out-of-plane triplet-exciton-LO-phonon coupling in 2D perovskites.
Article
Chemistry, Multidisciplinary
Jianbo Tang, Wenming Tian, Chunyi Zhao, Qi Sun, Chunyang Zhang, Hui Cheng, Yantao Shi, Shengye Jin
Summary: This study investigates the degradation mechanism of 2D perovskite under moisture conditions and finds that larger-n phases directly degrade into the stable n=1 phase, MAI, and PbI2. This discovery provides a new perspective for improving the moisture stability of perovskite materials.
Article
Chemistry, Applied
Xiaoxia Zhao, Zhiyong Wang, Wenming Tian, Xianchang Yan, Yantao Shi, Yudi Wang, Zhonggao Sun, Shengye Jin
Summary: Developing an interplay between the local morphological character and its local photovoltaic (PV) parameters in a perovskite thin film is crucial for guiding the construction of highly-efficient perovskite solar cells (PSCs). The study finds that larger perovskite grains often have fewer defects and better charge collection efficiency, with the optimum grain size being >2 micrometers.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Wei Qin, Wajid Ali, Jianfeng Wang, Yong Liu, Xiaolan Yan, Pengfei Zhang, Zhaochi Feng, Hao Tian, Yanfeng Yin, Wenming Tian, Can Li
Summary: The authors manipulated ferroelastic lattice deformation using electric fields to study non-radiative recombination and strain in twinning tetragonal phase, leading to an increased open-circuit voltage of 1.26 V. This study provides insights into the low non-radiative recombination in metal halide perovskite solar cells.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Zixi Yin, Qi Sun, Jing Leng, Lifang Liu, Boning Wu, Shengye Jin
Summary: The encapsulation of perovskite quantum dots (PQDs) in metal-organic frameworks (MOF) improves their environmental stability and optical property. In this study, CH(3)NH(3)Pb-(Br/I)(3) PQDs were encapsulated in a zinc isophthalate MOF to construct a solid hybrid composite (PQDs@Y346). The PQDs@Y346 composites exhibited enhanced photostability and a long-lived delayed emission from PQDs due to a Y346-to-PQDs triplet-energy transfer process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jianbo Tang, Wenming Tian, Fengke Sun, Qi Sun, Jing Leng, Shengli Zhao, Shengye Jin
Summary: It has been found that phase segregation in mixed halide perovskites can improve the photoluminescence quantum yield (PLQY) by concentrating carriers. However, the effect of phase segregation on photoinduced carrier dynamics is not well understood. In this study, phase segregation in CH3NH3PbBrxI3-x mixed halide perovskite thin films was found to be morphology-dependent, with I-rich domains mainly along the grain boundaries. Ultrafast transient absorption (TA) and photoluminescence upconversion (PL-UC) spectroscopy measurements revealed carrier transfer pathways from the Br-rich domain and mixed phase to the I-rich domain. This finding provides insights into carrier funneling dynamics in phase-segregated halide perovskite films and offers guidance for the application of mixed halide perovskites in color-conversion devices or high-efficiency LEDs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Le Zeng, Tiexin Zhang, Renhai Liu, Wenming Tian, Kaifeng Wu, Jingyi Zhu, Zhonghe Wang, Cheng He, Jing Feng, Xiangyang Guo, Abdoulkader Ibro Douka, Chunying Duan
Summary: By tuning the stacking mode of dyes, a sulfur-bridged naphthalene diimide string is created in coordination polymer, which enhances electron mobility and preserves competent excited-state reducing power. In combination with in situ assembly with exogenous reagent/reactant, this approach improves the accessibility of short-lived excited states and results in greater efficiency in photoinduced electron-transfer activation of inert bonds. This heterogeneous approach is successfully applied in the photoreduction of inert aryl halides and the formation of C-Ar-C/S/P/B bonds with potential pharmaceutical applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jianbo Tang, Wenming Tian, Fengke Sun, Qi Sun, Jing Leng, Shengli Zhao, Shengye Jin
Summary: The phase segregation in mixed halide perovskites improves the photoluminescence quantum yield by concentrating the carriers, but its effect on the photoinduced carrier dynamics is unclear. This study demonstrates that phase segregation in CH3NH3PbBrxI3-x perovskite thin film is morphology-dependent, with I-rich domains mainly along the grain boundaries. The carrier transfer from the Br-rich domain and the mixed phase to the I-rich domain occurs through consecutive hole and electron transfer, as well as energy transfer. This finding reveals the carrier funneling dynamic mechanism in phase-segregated halide perovskite films and provides guidance for their applications in color-conversion devices or high-efficiency LEDs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Hengshan Wang, Yanfeng Yin, Jiao Xu, Jing Li, Yanan Bao, Meiqi An, Lingzhi Tang, Shengye Jin, Wenming Tian, Yiming Yang
Summary: The dynamic crystal lattice of halide perovskites facilitates the coupled transport of ions and electrons, offering innovative concepts in semiconductor iontronic devices. This study focused on investigating electric field induced ionic transport in CsPbBr3 nanowires and discovered highly anisotropic ionic transport upon poling. The giant switchable photovoltaic effect was identified, along with significant localization of photocarriers near one terminal of the device, attributed to the accumulation of halogen vacancies. The poled device showed a 10-fold increase of photoresponse speed due to enhancement of the local electric field.
Review
Chemistry, Physical
Qi Sun, Xinlei Zhang, Chunyi Zhao, Wenming Tian, Shengye Jin
Summary: This review focuses on the recent progress in probing and regulating carrier transport kinetics in perovskite materials, mainly using time-resolved spectroscopy techniques. The challenges and outlooks in this field are also discussed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Shengli Zhao, Jing Leng, Shiping Wang, Xianchang Yan, Zixi Yin, Yanfeng Yin, Jun Zhang, Shengye Jin
Summary: In this study, a modified transient reflection (TR) spectroscopy method was developed to directly observe and determine the longitudinal carrier transport process in MAPbI(3) polycrystalline thin films. By spatially separating the pump and probe beams on each side of the film, the carrier transport dynamics along the film thickness were resolved. The longitudinal carrier diffusion coefficients (D) in perovskite films with different thicknesses and grain sizes were determined, providing a reference for quick quality screening and evaluation of perovskite polycrystalline thin films.