OPTICAL MATERIALS
·
2022
·
IF 3.754
Yonglei Xing,Wenbo Lv,Jie Liu,Jitao Huang
Because of the good passivation effect of PCBM on the perovskite surface, ion-migration-related phenomena are barely discussed in the inverted perovskite solar cells (PSCs). However, when applying the ZnO as electron transport material (ETM) to replace PCBM, the resulting PSC device exhibits J - V hysteresis to some extent. Here we compare the J - V performances of the inverted PSC devices using ZnO and PCBM as ETMs. We find that the use of the ZnO results in an obvious light soaking phenomenon and J - V hysteresis. While the use of PCBM leads to the elimination of the J - V hysteresis. The time-dependent photocurrent response and the capacitance-frequency ( C – F ) measurement suggest the existence of fast and slow ion migration in the MAPbI 3 film. The activation energy ( E a ) for the slow ion migration reduces under illumination, being the main reason for the J - V hysteresis for the ZnO-based PSC device. While PCBM passivates the slow ion migration, leading to the elimination of the J - V hysteresis.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 27
·2200867
·
IF 29.698
Sheng Zhan,Yuwei Duan,Zhike Liu,Lu Yang,Kun He,Yuhang Che,Wenjing Zhao,Yu Han,Shaomin Yang,Guangtao Zhao,Ningyi Yuan,Jianning Ding,Shengzhong (Frank) Liu
Formamidinium methylammonium lead iodide (FAMAPbI 3 ) perovskite has been intensively investigated as a potential photovoltaic material because it has higher phase stability than its pure FAPbI 3 perovskite counterpart. However, its power conversion efficiency (PCE) is significantly inferior due to its high density of surface detects and mismatched energy level with electrodes. Herein, a bifunctional passivator, methyl haloacetate (methyl chloroacetate, (MClA), methyl bromoacetate (MBrA)), is designed to reduce defect density, to tune the energy levels and to improve interfacial charge extraction in the FAMAPbI 3 perovskite cell by synergistic passivation of both CO groups and halogen anions. As predicted by modeling undercoordinated Pb 2+ , the MBrA shows a very strong interaction with Pb 2+ by forming a dimer complex ([C 6 H 10 Br 2 O 4 Pb] 2+ ), which effectively reduces the defect density of the perovskite and suppresses non-radiative recombination. Meanwhile, the Br − in MBrA passivates iodine-deficient defects. Consequently, the MBrA-modified device presents an excellent PCE of 24.29%, an open-circuit voltage ( V oc ) of 1.18 V ( V oc loss ≈ 0.38 V), which is one of the highest PCEs among all FAMAPbI 3 -based perovskite solar cells reported to date. Furthermore, the MBrA-modified devices without any encapsulation exhibit remarkable long-term stability with only 9% of PCE loss after exposure to ambient air for 1440 h.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Shujie Tie,Deyu Xin,Siyin Dong,Bing Cai,Jianguo Zhu,Xiaojia Zheng
Perovskite X-ray detectors are promising in medical diagnosis and industrial inspection because of their high sensitivity and low limit of detection (LoD). Lead-free MA3Bi2I9 perovskite derivatives show good stability, environmental friendliness, and excellent electronic properties for sensitive X-ray detection. Here, we report the fabrication of MA3Bi2I9 X-ray detectors by a facile, high-throughput, and low-cost antisolvent-assisted synthesis (ASAS) method with a high product yield >90%. Electronic characteristics of MA3Bi2I9 were modulated by Cs alloying, leading to a high resistivity (1011 Ω cm) and a low dark carrier concentration (107 cm–3). As a result, (MA0.7Cs0.3)3Bi2I9-alloyed X-ray detectors show an LoD of 12.8 nGyair s–1 and a sensitivity of 130 μC Gyair–1 cm–2, outperforming that of a commercialized amorphous selenium (a-Se) detector. This study develops high-performance lead-free X-ray detectors with a robust, low-cost, and scalable fabrication process, which will pave the way for adopting polycrystalline MA3Bi2I9 in X-ray detectors.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·890-897
·
IF 2.606
Tian Zhennan,Wu Taiqi,Hu Rong,Yu Junsheng,Cheng Jiang,Li Lu
In this study, a ZnO-Fe 2 O 3 thin film was designed as electron transport layer for organic solar cells (OSCs). The preparation strategy was based on the spin coating of aqueous sol–gel precursor. The result showed that composite ZnO-Fe 2 O 3 -based OSCs had higher power conversion efficiency than pure ZnO-based OSCs. To explain this result, morphology, optical and physical properties of ZnO-Fe 2 O 3 were investigated to analyze the relation between structure of interface layer and performance of OSCs. It was demonstrated that composite ZnO-Fe 2 O 3 layer had denser structure and lower surface roughness than pure ZnO layer. Thus, it showed a good contact with the active layer. Furthermore, 3.3% Fe 2 O 3 could reduce the W F and E g of ZnO, and greatly enhanced electron mobility from the acceptor (IT-4F) phase to the ZnO/ITO electrode. Meanwhile, ZnO-Fe 2 O 3 layer showed a low reflectivity that allowed more photons to entrance the active layer for utilization. Hence, the higher short-circuit current and power conversion efficiency were achieved in ZnO-Fe 2 O 3 -based OSCs.
Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Miaomiao Li,Junwei Yuan,Guan Wang,Liujun Yang,Junxia Shao,Hua Li,Jianmei Lu
The key to efficient treatment of organic pollutants in water is to improve their mass transfer efficiency and reaction efficiency. Herein, a one-step construction of new metal-organic frameworks (MOFs) using 4, 4′, 4″, 4″-(pyrene-1, 3, 6, 8-tetrayl) tetra-benzoic acid as a photosensitizer ligand and Ti-In as bimetallic centers has been constructed. The results exhibited that increased specific surface area was obtained by Ti-In-MOF(1:1), which improved the adsorption performance of 50 ppm bisphenol A to 38% and facilitated it complete degradation upon light irradiation in 20 min, being much faster than that of single In/Ti-MOFs. For Ti-In-MOF(1:1), the In-MOF parts enhanced the adsorption capability, meanwhile the Ti-MOF parts based on infinite Ti-O chains realized the effective separation of photogenerated carriers. A synergistic role of adsorption and degradation achieved rapid mass transfer and excellent catalytic degradation performance. This investigation will provide a novel MOF construction strategy for efficient catalytic application in environmental pollutants.
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Nano Energy
·
2022
·
IF 19.069
Cheng Yan,Xiankan Zeng,Qungui Wang,Xiaodong Peng,Wen Li,Jingjing Cao,Yue Gao,Xiang Chu,Xuehai Fu,Shiyu Yang,Yongjian Chen,Weiqing Yang
To fundamentally understand the underlying interfacial physics of hole transporting layer is a key to rotationally engineer high-performance light-emitting diodes (LEDs). Here, we unravel the hole interlayer-dependent interfacial energetics of LEDs via combining imaged contact potential/polarization difference, and multi-time scale capacitance/voltage response. A universally existing but undesired stagnation of current density with voltages, under the direct contact of light-emitting Poly-TPD with electrodes, was proved to be rooted from the alternant dominance of capacitance/resistance behaviors with alternating strong/weak polarizations of Poly-TPD. The introduction of hole interlayer (PEDOT:PSS) with more disordered polarization direction and greater intensity can build plentiful carrier hopping channels and ensure the rapidly dynamic charge transfer from electrodes to Poly-TPD, conducing to the increased capacitive reactance contribution at low voltages and inductive effects at high voltages. Also, we clarify its frequency-response difference for emerging high-speed modulation application. This discovery might enable us to explore the next-generation high-efficiency display and optical data-communication.
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RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2022
·Vol. 36
·期 21
·e9381
·
IF 2.586
Baocheng Ji,Yu Han,Wenhao Zhao,Lanrui Yang,Xu Xu,Yanhong Bai
Rationale Various solvent supports have been developed to overcome solvent instability during liquid-phase microextraction. The hydrophobic polyurethane sponge (PS) possesses numerous cross-linked internal microchannels and terminal micropores that can facilitate steady solvent storage capacity, high extraction efficiency, extractant loading, and recycling convenience. Methods In this study, an easy, convenient, and efficient PS-supported liquid-phase microextraction (PS-LPME) coupled with gas chromatography–mass spectrometry (GC–MS) method was developed for the trace analysis of different organic compounds in aqueous solutions. Different extraction solvents, PS dosages, stirring speeds, and extraction times were first investigated by extracting eight polycyclic aromatic hydrocarbons (PAHs: naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, and pyrene), and then applied for the analysis of triazines, amides, chloroacetamides, and organophosphorus compounds. Results High enrichment factors (approximately 208–439) were observed for the monitored PAHs. Good linearities, with determination coefficients ( r 2 ) greater than 0.9992, were achieved in the concentration range of 0.01–50 μg L −1 . Low limits of detection and quantification were found in the ranges of 0.3–3 ng L −1 and 1–10 ng L −1 , respectively. At three spiked concentrations (0.1, 1, and 10 μg L −1 ), good recoveries were obtained in the range of 91.6–118.5% with intra- and inter-day relative standard deviations of less than 6.4% and 11.7%, respectively. Conclusions The developed PS-LPME method coupled with GC–MS was successfully applied in the analysis of different organic compounds in aqueous solutions and has shown great convenience and satisfactory enrichment performance in microextraction analysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
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Materials Today Physics
·
2022
·
IF 11.021
Fengxian Cao,Huiwen Chen,Shibo Wang,Pengxu Chen,Chenwei Zhu,Zhang Lan,Weihai Sun,Yunlong Li,Jihuai Wu
The highly efficient perovskite solar cells (PSCs) along with excellent long-term stability can be obtained by fabricating two-dimensional (2D) perovskites (PVKs) over the three-dimensional (3D) PVKs film. However, the additional step of forming 2D PVKs before depositing the hole/electron transporting layer would make the device fabrication processes complicated, increasing costs for the manufacture of PSCs. In the present work, 2D PVKs were in-situ formed on surface of the 3D PVKs film by a self-assembly method, together with the deposition of the hole transporting material (HTM) at the same time, which tremendously simplified the fabrication of PSCs based on 3D PVKs/2D PVKs. Based on the one-step constructed 2D PVKs/HTM dual interfacial layers , density of trap states in devices were decreased remarkably owing to efficient interfacial passivation . In the meantime, the hydrophobicity , conductivity and hole extraction ability of the HTM were generally improved, enhancing the operational stability and performance of the solar cells. Thus, the corresponding solar cells increased 10% of average power conversion efficiency , where the highest open circuit voltage is up to 1.174 V. After 672 h of exposure under full 1-sun simulation in ambient conditions, the device still retained more than 82% of its initial PCE which was almost 50% higher than that of the control device.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Zhiqiang Deng,Rui Zhao,Tonghui Guo,Zequn Zhang,Yanjun Xing,Jing Zhang,Xiaohui Liu,Like Huang,Ziyang Hu,Yuejin Zhu
Inorganic nickel oxide (NiO x )-based inverted perovskite solar cells (PSCs) are reported to be more stable compared to those using organic hole transport layer materials. However, the Fermi level of NiO x is relatively away from the valence band of perovskite (PVK) layer, causing a large energy level shift at the NiO x /PVK interface and a weak built-in electric field strength . These increase the possibility of recombination, reduce the effective charge collection, seriously affect the efficiency of the device. In this work, an interface dipole with -CF 3 end group is anchored to the NiO x /PVK interface, leading to a more matched energy level structure and greatly reducing the energy barrier at the NiO x /PVK interface. Moreover, the addition of Si-CF 3 significantly improves the conductivity of NiO x and blunts the defects to large extent. The dipole interlayer significantly improves the built-in electric field and thus increases the photovoltage . Ultimately, the modified device achieves a score of 19.58% efficiency, much better than 17.98% of the control device.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 16
·6473-6480
·
IF 8.067
Junhan Guo,Yang Tang,Longtao Li,Pengcheng Jia,Bo Song,Xin Liu,Xiaomeng Li,Zhenbo Deng,Zhidong Lou,Yufeng Hu,Feng Teng,Liang Qin,Yanbing Hou
Micro–nano cesium lead halide perovskites have become one of the most potential materials for optoelectronic applications due to their excellent photoelectric properties such as tunable band gap, high absorption efficiency, long carrier diffusion length, and high stability. Although significant efforts have been made to grow CsPbBr3 single crystal perovskites via solution processing, it is difficult to prepare discrete high-quality factors and small volumes of Fabry–Pérot (F–P) mode and whispering-gallery-mode (WGM) optical resonators on the substrate due to random nucleation and excessive nucleation points, which lead to the accretion of a large number of crystallites. In this work, CsPbBr3 crystallites with different aspect ratios have been prepared on poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine] (PTAA) modified glass substrates by combining the control of evaporation rate of anti-solvents with the coffee ring effect and Marangoni effect. Due to the hydrophobic properties of PTAA, the nucleation points are significantly reduced, resulting in the growth of high-quality and robust single crystals separated from each other. These crystallites exhibit a high-quality factor (Q = 1200–1600) with a threshold of 10–20 μJ cm−2. The results indicate that the prepared CsPbBr3 crystallites can be used as promising micro–nano F–P and WGM lasers.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Beier Hu,Jing Zhang,Zhongli Guo,Lihua Lu,Puyang Li,Mengyu Chen,Cheng Li
Instability caused by the migrating ions is one of the major obstacles toward the large-scale application of metal halide perovskite optoelectronics. Inactivating mobile ions/defects via chemical passivation, e.g., amino acid treatment, is a widely accepted approach to solve that problem. To investigate the detailed interplay, L-phenylalanine (PAA), a typical amino acid, is used to modify the SnO2/MAPbI3 interface. The champion device with PAA treatment maintains 80% of its initial power conversion efficiency (PCE) when stored after 528 h in an ambient condition with the relative humidity exceeding 70%. By employing a wide-field photoluminescence imaging microscope to visualize the ion movement and calculate ionic mobility quantitatively, we propose a model for enhanced stability in perspective of suppressed ion migration. Besides, we reveal that the PAA dipole layer facilitates charge transfer at the interface, enhancing the PCE of devices. Our work may provide an in-depth understanding toward high-efficiency and stable perovskite optoelectronic devices.
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