Advanced Energy Materials
·
2020
·Vol. 10
·期 23
·2000687
·
IF 25.245
Jianming Yang,Shaobing Xiong,Jingnan Song,Hongbo Wu,Yihan Zeng,Linyang Lu,Kongchao Shen,Tianyu Hao,Zaifei Ma,Feng Liu,Chungang Duan,Mats Fahlman,Qinye Bao
2D Ruddlesden–Popper perovskites (RPPs) are emerging as potential challengers to their 3D counterpart due to superior stability and competitive efficiency. However, the fundamental questions on energetics of the 2D RPPs are not well understood. Here, the energetics at (PEA) 2 (MA) n −1 Pb n I 3 n +1 /[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) interfaces with varying n values of 1, 3, 5, 40, and ∞ are systematically investigated. It is found that n–n junctions form at the 2D RPP interfaces ( n = 3, 5, and 40), instead of p–n junctions in the pure 2D and 3D scenarios ( n = 1 and ∞). The potential gradient across phenethylammonium iodide ligands that significantly decreases surface work function, promotes separation of the photogenerated charge carriers with electron transferring from perovskite crystal to ligand at the interface, reducing charge recombination, which contributes to the smallest energy loss and the highest open-circuit voltage ( V oc ) in the perovskite solar cells (PSCs) based on the 2D RPP ( n = 5)/PCBM. The mechanism is further verified by inserting a thin 2D RPP capping layer between pure 3D perovskite and PCBM in PSCs, causing the V oc to evidently increase by 94 mV. Capacitance–voltage measurements with Mott–Schottky analysis demonstrate that such V oc improvement is attributed to the enhanced potential at the interface.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wen Li,Shiyu Yang,Bolin Guo,Xuehai Fu,Xiankan Zeng,Cheng Yan,Jingjing Cao,Qungui Wang,Weiqing Yang
Two-dimensional (2D) Ruddlesden-Popper hybrid organic-inorganic perovskites are the most promising candidates for highly efficient optoelectronic devices due to their remarkable exciton characteristics, adjustable band structure and long-term environmental stability. However, excitons emission behavior of 2D Ruddlesden-Popper perovskites is still unclear. Here we theoretically-experimentally decoupled the excitons behavior in 2D Ruddlesden-Popper PEA 2 PbI 4 nanosheets . Theoretically, the Elliott theory was used to separate exciton and band edge absorptions of PEA 2 PbI 4 nanosheets and determine an exciton binding energy of about 274 meV. Experimentally, spectral-dependent photoluminescence lifetime and excitation powder density-dependent photoluminescence spectra revealed that a distinct photoluminescence tail emission should be derived from localized excitons with lower emission energy than free excitons. Further, the luminescent component of the free excitons and localized excitons with their corresponding densities of states was theoretically decoupled by line-shape analysis of PEA 2 PbI 4 nanosheets photoluminescence spectra, which is consistent with the experimental results demonstrating the existence of localized excitons. Hence, our work provides understanding on the exciton behavior and luminescence mechanism of 2D Ruddlesden-Popper perovskites, which would benefit the prediction of high-performance excitonic devices based on 2D Ruddlesden-Popper perovskites.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Jinxin Li,Dan Zhong,Yiru Chen,Kefei Li,Wencheng Ma,Shaobo Zhang,Jingna Zhang,Aoshuang Sun,Haijiao Xie
Coal pyrolysis wastewater (CPW) contained all kinds of toxic and harmful components, which would seriously threaten the natural environment and human health. However, the traditional advanced oxidation processes frequently failed to remove phenolic substances. An A 2 BO 4 -type perovskite (La 2 CuO 4 ) was successfully synthesized through sol-gel process and first applied in the treatment of CPW. More than 90% of 3, 5-dimethylphenol (DMP) was removed within 200 min at neutral conditions. Moreover, La 2 CuO 4 also displayed excellent catalytic activity and stability in the actual CPW treatment process. Results demonstrated that DMP was removed through the attack of ∙OH, ∙O 2 − and 1 O 2 in La 2 CuO 4 /H 2 O 2 system. The La 2 CuO 4 were more favorable for H 2 O 2 activation and have a lower adsorption energy than LaFeO 3 . XPS of fresh and spent La 2 CuO 4 illustrated that the decomposition of hydrogen peroxide (H 2 O 2 ) was mainly due to the redox cycle between surface copper and oxygen species. Moreover, the possible degradation pathway of DMP was deduced by identifying degradation products and analyzing density functional theory (DFT) calculations. This research provided a novel strategy for the development of perovskite-based catalytic materials on the treatment of practical CPW.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE Sensors Letters
·
2025
·
IF 2.2
Min Zhang,Yuancheng Wang,Xiao Wang,Dingyu Yang
Photodetectors serve as a critical link between photonic and electronic systems, playing a key role in the caption, transmission, and processing of information. Low-dimensional Ruddlesden-Popper (RP) perovskites exhibit remarkable environmental stability, minimal ion migration, and tunable structure, offering significant benefits for the development of stable and practical optoelectronic devices. In this work, the liquid-phase perovskite BA2MA4Pb5I16·xCH3NH2 was effectively synthesized by reacting methylamine gas molecules with RP perovskite powder through a solid-gas interaction, eliminating the requirement for high-boiling-point solvents. Photodetectors and pixelated imaging devices were constructed by spin-coating technique. Detectors with outstanding sensitivity for detecting faint light and fast response capabilities was realized, facilitating high-resolution imaging of various objects. This study offers novel insights and approaches to promote the application of perovskite materials in the field of photodetection and imaging.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
应用物理学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2018
·Vol. 30
·期 21
·1707166
·
IF 21.95
Xu Zhang,Rahim Munir,Zhuo Xu,Yucheng Liu,Hsinhan Tsai,Wanyi Nie,Jianbo Li,Tianqi Niu,Detlef-M. Smilgies,Mercouri G. Kanatzidis,Aditya D. Mohite,Kui Zhao,Aram Amassian,Shengzhong (Frank) Liu
Ruddlesden–Popper reduced-dimensional hybrid perovskite (RDP) semiconductors have attracted significant attention recently due to their promising stability and excellent optoelectronic properties. Here, the RDP crystallization mechanism in real time from liquid precursors to the solid film is investigated, and how the phase transition kinetics influences phase purity, quantum well orientation, and photovoltaic performance is revealed. An important template-induced nucleation and growth of the desired (BA) 2 (MA) 3 Pb 4 I 13 phase, which is achieved only via direct crystallization without formation of intermediate phases, is observed. As such, the thermodynamically preferred perpendicular crystal orientation and high phase purity are obtained. At low temperature, the formation of intermediate phases, including PbI 2 crystals and solvate complexes, slows down intercalation of ions and increases nucleation barrier, leading to formation of multiple RDP phases and orientation randomness. These insights enable to obtain high quality (BA) 2 (MA) 3 Pb 4 I 13 films with preferentially perpendicular quantum well orientation, high phase purity, smooth film surface, and improved optoelectronic properties. The resulting devices exhibit high power conversion efficiency of 12.17%. This work should help guide the perovskite community to better control Ruddlesden–Popper perovskite structure and further improve optoelectronic and solar cell devices.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiahui Hou,Yangchun Yu,Sanam Attique,Bingqiang Cao,Shikuan Yang
The room-temperature saturation recrystallization (RTSR) method has been extensively used to prepare all-inorganic lead halide perovskite (e.g., CsPbBr3) nanocrystals. Here, we revealed that the composition of the products prepared by the seemingly simple RTSR method could be extremely complex under different experimental parameters. The pH value of the solution and the protonation tendency of the amines influenced by the amounts and types of introduced amines, oleic acid, and water from the environment determined the composition of the final products. PbBr2, 2D Ruddlesden–Popper perovskites (RPPs) formed by perovskite layers separated by intercalating cations, and laurionite Pb(OH)Br would form under acidic, mildly acidic, and alkaline conditions, respectively. Based on the understanding of the formation mechanism, Pb(OH)Br microparticles with well-defined morphologies were prepared, which could be transformed into highly luminescent CH3NH3PbBr3 with the morphology unchanged. The protonated amine behaves as an intercalating layer during the formation of 2D RPPs. Phenylethylamine (PEA) was proven to be an appropriate amine to prepare pure RPP microplates because of its weaker alkalinity compared to aliphatic amines. The prepared (PEA)2PbBr4 RPP microplates showed strong deep-blue light emission with a PL peak at 415 nm, which could be fine-tuned by changing amines. This study proved the complex reaction pathways of the seemingly simple RTSR method and extended the RTSR method into the fabrication of 2D RPPs and laurionite with promising applications in optoelectronic devices.
研究领域:
材料科学
·
化学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yanzhu Deng,Juwei Du,Yan Zhu,Ling Zhao,Huanwen Wang,Yansheng Gong,Jun Jin,Beibei He,Rui Wang
The development of noble metal-based bifunctional electrocatalysts is the key to driving the sluggish oxygen reduction/evolution reaction (ORR/OER) for rechargeable zinc-air battery applications. There is an urgent need to design and construct robust and cost-efficient bifunctional electrocatalysts . Herein, an interface engineering strategy of Ruddlesden–Popper (RP) perovskite/CeO 2 /carbon heterojunction with core–shell nanostructures is described. Ce-based metal–organic framework derived CeO 2 -C nanosheets are decorated on the surface of RP type perovskite Pr 3 Sr(Ni 0.5 Co 0.5 ) 3 O 10−δ (PSNC) nanofibers . Benefiting from the favorable conductivity, abundant oxygen vacancies and strong interfacial coupling, the hierarchical CeO 2 -C/PSNC electrode delivers a half-wave potential of 0.78 V (ORR), and an OER overpotential of 370 mV at 10 mA cm −2 , respectively. A liquid rechargeable zinc-air battery (ZAB) assembled with CeO 2 -C/PSNC electrocatalysts as the air cathode exhibits a peak power density of 161 mW cm −2 and a long-term cycling life over 219 h. In addition, the CeO 2 -C/PSNC-based all-solid-state cable-type ZAB provides a high open-circuit voltage (∼1.44 V), good flexibility and durability. Our study opens a new insight into the design of efficient electrocatalysts for rechargeable ZABs by constructing hierarchical heterojunctions.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Guohong Pan,Yanzhu Deng,Ling Zhao,Huanwen Wang,Rui Wang,Jun Jin,Yansheng Gong,Beibei He
Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the prerequisite reactions in rechargeable zinc-air batteries (ZABs), but their kinetics are usually slow. In order to develop energy-efficient ZABs, it is highly desirable to pursue bifunctional catalysts with the accelerated reaction kinetics and the reduced overpotentials. Transition metal oxides are expected as promising alternatives to replace noble metal-based catalysts, but their catalytic activities are still far from desirable. Herein, we propose a modified layer of Ruddlesden-Popper perovskite (Pr,Sr) 2 Ni 0.5 Co 0.5 O 4-δ (RP-PSNC) on the perovskite PrNi 0.5 Co 0.5 O 3-δ (P-PNC) nanofiber by a simple impregnation method, receiving a (Pr,Sr) 2 Ni 0.5 Co 0.5 O 4-δ / PrNi 0.5 Co 0.5 O 3-δ (RP-PSNC/P-PNC) heterostructured nanofibers. The RP-PSNC/P-PNC hybrid catalyst exhibits a small overpotential and an excellent stability due to the large number of vacancies in the two-phase interface. The RP-PSNC/P-PNC-based liquid rechargeable ZAB reaches a power density of 145 mW cm −2 , and 230 h of long-term cycle performance. When assembled into flexible ZABs, it can also reach a power density of 51 mW cm −2 and a stable open circuit voltage (∼1.35 V) for 44 h. These results indicate that the bifunctional electrocatalyst of heterostructured RP-PSNC/P-PNC provides a new path for the modification of perovskites through multi-phase catalysts system, and has great potential in rechargeable ZABs and other energy conversion devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7896-7908
·
IF 4.682
Xu Tianye,Lu Shun,Wang Yajie,Gan Xiaoyan,Guo Liling,Liu Hanxing
Two-dimensional (2D) perovskite formed by introducing various organic spacer cations into 3D perovskite is considered to be one of the most effective methods to improve the humidity stability of perovskite materials. In order to solve the phase inhomogeneity and phase distribution nonuniformity of two-dimensional perovskites, additive engineering technique is widely used during their fabrication processes. Although many additives are proved to be effective in improving the quality of perovskite films, the mechanism of additive engineering has not been fully understood. In our work, we prepare 2D Ruddlesden–Popper perovskites based on 4-bromophenylethylammonium (BPEA) using a new additive of ionic liquids MAAc (methylammonium acetate). The (BPEA) 2 (MA) 4 Pb 5 I 16 perovskite prepared with the assistance of MAAc exhibits a stable photoelectric conversion efficiency (PCE) of 8.47%, which is much higher than the one without MAAc additive (4.79%). Besides a nearly tenfold increase in electron mobility, the unencapsulated (BPEA) 2 (MA) 4 Pb 5 I 16 -based device with MAAc additive remains 88% of its initial efficiency after 960 h exposure to air with a humidity of 20 ± 5% at room temperature, while the device without additive decreases to 63% of its initial efficiency. Meanwhile, the interactions between PbI 2 and MAAc at different temperatures and molar ratios are investigated and the formation mechanism of 2D perovskites in the presence of MAAc is proposed. It is found that an intermediate perovskite with distorted [PbI 6− x Ac x ] 4− octahedron is formed with the addition of MAAc, making the quality and photoelectric properties of the resultant films greatly enhanced.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 3
·571
·
IF 5.3
Xinwei Zhao,Ting Zheng,Weiwei Zhao,Yuanfang Yu,Wenhui Wang,Zhenhua Ni
The intrinsic chaotic phase distribution in Ruddlesden-Popper Perovskite (RPP) hinders its further improvement of photoluminescence (PL) emission and limits its application in optical devices. In this work, we achieve the phase distribution regulation of RPP by varying the composition ratio of organic bulky spacer cations 1-naphthylmethylamine (NMA) and phenylethyl-ammonium (PEA), which is controllable and nondestructive for structures of RPP. By suppressing the small n-phase, the PL intensity emission of RPP is further improved. Through the time-resolved PL (TRPL) measurements, we find the PL lifetime of the sample with 66% PEA concentration increases with the temperature initially and possesses the highest values ofτ1andτ2at ~255 K, indicating the immediate state assisting exciton radiative recombination, and it can be modulated by phase manipulation in RPP. The immediate state may outcompete other non-radiative decay channels for excited carriers, leading to the PL enhancement in RPP, and broadening its further application.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Tong Guo,Cheng Tian,Shiqi Zhao,Zihao Chu,Jingli Ma,Ying Li,Zhifeng Shi,Guangzhao Ran
Two-dimensional (2D) Ruddlesden–Popper (RP) perovskites are excellent optoelectronic materials due to their natural quantum well structure and enhanced environmental stability. However, the growth of their large-area high-quality thin films is still fundamentally challenging. Herein, a novel gravity-guided growth method is proposed to grow a wafer-scale (∼8 cm2) (PEA)2PbBr4 thin films (∼μm) with a centimeter-scale crystal domain on an inclined substrate. A model is established to elucidate the role of gravity in the growth process. It can be concluded that the tip of the precursor solution on an inclined substrate should be preferentially induced to nucleate and crystallize. In addition, the crystallization growth is directionally guided and its velocity increases as the rear contact angle decreases. Experimentally, the controllable inclination angles can optimize the quality and thickness of the films. Moreover, the arrayed photodetectors based on the resulting (PEA)2PbBr4 thin films have been demonstrated to have an extremely dark current of 10–12 A and good environmental stability. After 100 days of storage in the atmosphere for the unencapsulated samples, there is only a small photocurrent degradation of 18%. This work provides a promising solution for scalable fabrication of the large-area high-quality 2D perovskite thin films that can serve as a good candidate for stable photodetectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shu-Fang Li,Bao-Qin Zhang,Yu-Qing Wang,Dong Yan
Prior studies have demonstrated that Ruddlesden–Popper (RP) type perovskite oxides exhibit promising electrocatalytic properties for oxygen evolution reaction (OER). However, the limited electrocatalytic activity has impeded their widespread utilization. The incorporation of heteroatoms into the Ruddlesden–Popper type structure has been identified as an effective strategy to enhance the electrocatalytic performance. This research presents the systematic design and synthesis of RP type perovskite oxide LaSrFeO 4 (LSFO), followed by the optimization of electrocatalytic activity through Ni substitution at the Fe site of SLFO to create LaSrFe 1- x Ni x O 4 (LSFNO- x , x = 0.2, 0.4, and 0.5). Therein, the LSFNO-0.4 sample achieved a current density of 10 mA·cm −2 with an overpotential of only 340 mV. Additionally, it displayed exceptional stability over 120 h in a 1.0 M KOH solution. Both experimental and theoretical studies suggest that the addition of Ni cation increases the Fe − O covalency, and impacts the morphology and surface electron density of LSFO. This substitution results in a greater electrochemically active surface area, improved electron transfer, and optimization of hydrogen/water absorption free energy. This study presents a successful approach for enhancing the OER performance of Ruddlesden–Popper LSFO through the deliberate control of Fe − O covalent bonding.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）