ORGANIC ELECTRONICS
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2023
·
IF 3.2
Qinjun Sun,Xueting Fan,Shuai Han,Hongyan Lv,Jian Zhao,Liyan Gao,Yuying Hao
Perovskite solar cells are generally fabricated by one-step or two-step solution deposition in an inert atmosphere . It is obvious that large-scale perovskite film preparation process in the air is the future trend. However, perovskite materials are easily degraded by water, resulting in low nucleation density and incomplete coverage of perovskite film. Here, we choose the drip-pressing method to regulate the quantity of moisture, which can also balance the grains growth and solvent volatility. The perovskite films were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), UV–visible absorption, steady-state photoluminescence (PL) and in situ PL measurement. The orientation and quality of perovskite crystal are improved significantly in drip pressing, compared with traditional spin-coating. In addition, it facilitates to adjust the crystallization kinetics of perovskite by altering the imposed pressure in drip pressing. The grain size increases first and then decreases as pressure increases, reaching a maximum at 10 kPa. Meanwhile, the films become more and more compact as pressure increases. Perovskite films show great photoelectric performance at 30 kPa. The photoelectric conversion efficiency of the device in air can be improved from 10.99% to 13.21%. The results indicate that the drip-pressing method is in favor of high-quality of perovskite crystal in air.
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高影响因子
Journal of Physical Chemistry C
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2023
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IF 3.7
Lingwei Kong,Xiaoqing Cao,Kaixiang Liang,Ruixing Wang,Jing Liu,Wenying Shi,Chao Lu
Carbon nitride (CN) is an ideal candidate as a passivating agent for perovskite (PVK) due to its large π-conjugated structure and rich surface functional groups. Unfortunately, its intrinsic two-dimensional (2D) multilayer structure decreases the interlayer charge transfer, which is not conducive to the high efficiency of perovskite solar cells (PSCs). Here, layered double hydroxides (LDHs) provide a confinement space to control the growth of CN, giving it atomic thickness and reduced interlayer distance, which improves the interlayer charge transfer. The rich functional groups (−NH2 and −OH) on the surface of the CN nanosheets can facilitate bonding to PVK, which provides a prerequisite for obtaining higher-quality PVK crystals. The synergy effect mentioned above allows the all-air processed carbon-based PSCs to reach a decent power conversion efficiency of 12.57%. Therefore, the exploration of ultrathin CN nanosheets with a larger π-conjugate structure to improve the quality of PVK will guide the advanced application of 2D materials in PSCs.
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高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Yahong Xie,Ke Zhao,Haobin Wang,Ying Qi,Peng Wei,Jian Cheng
SnO2 is considered as a promising electron transport material for carbon-based perovskite solar cells (C-PSCs) due to its excellent electron mobility, stability over TiO2, and low-temperature processing. However, the lattice mismatch and poor contact quality of the SnO2/CH3NH3PbI3 interface, as well as oxygen vacancies, usually lead to nonradiative recombination and limit the further improvement of photovoltaic performance. In this paper, two chitosan derivatives, chitosan quaternary ammonium salt (HACC) and carboxymethyl chitosan (CMCS), were used as additives for SnO2 to adjust the energy level and improve the contact performance of the SnO2/CH3NH3PbI3 interface. These two additives have suitable terminal active functional groups, amino group and hydroxyl group, which can interact with SnO2 and CH3NH3PbI3 at the interface, induce the crystal growth of the perovskite, and play a good role in passivating interfacial defects. Therefore, the interfacial contact and the charge-transfer ability were effectively enhanced. As a result, the addition of HACC and CMCS increased the PCE of C-PSCs from 10.17 to 12.42 and 13.39%, and the repeatability and long-term stability of the corresponding unencapsulated C-PSCs were also significantly improved. This work expands the vision for the future interface modification strategies to improve the device performance and is conducive to promote the further commercialization of C-PSCs.
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高影响因子
Micromachines
·
2023
·Vol. 14
·期 7
·1368
·
IF 3.4
Yan Lang,Shuru Xu,Chunbin Zhang
In this paper, a molybdenum disulfide fluorescent probe with an Fe3+fluorescent system was first synthesized by the hydrothermal method for the detection of iron ion concentration in oral solution of protein succinate. It was characterized by infrared, fluorescence, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The probes were found to have good stability, photobleaching, and storage stability. The effects of dilution, pH, reaction time, and iron ion concentration on the fluorescent system were also investigated. The relative fluorescence intensity [(I0− I)/I0] showed a good linear relationship with the iron ion concentration in the range of 0–50 μM, with the linear equation [(I0− I)/I0] = 0.0148[Fe3+] + 0.0833 (r2= 0.9943, n = 11) and the detection limit of 2.43 μM. The reaction mechanism was also explored, as well as its ion selectivity, reversibility, accuracy, precision, and concentration of Fe ions in the actual sample. It was found that the probe can selectively detect Fe ions with a certain degree of reversibility, accuracy, precision, and ideal recovery, and it can be used for the determination of Fe3+in proteosuccinic acid oral solution.Keywords:MoS2quantum dots;fluorescent probe;Fe3+;performance;protein succinic acid oral solution
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yunhao Fan,Feiyang Qiao,Daxue Du,Jiahao Bao,JingJing Liang,Hong Liu,Wenzhong Shen
The stability and toxicity problems have haunted the development and applications of metal halide perovskite materials, for which the lead-free inorganic double perovskite Cs2AgBiBr6 has emerged as a promising substitute in recent years. However, poor film quality has severely limited its photovoltaic performance that could have been induced by some key factors such as high annealing temperature. Herein, we present a facile strategy to fabricate high-quality pinhole-free Cs2AgBiBr6 films with large grain sizes by introducing carbohydrazide (CBH) into the precursor. Detailed characterizations have shown that the carbonyl group (C═O) in CBH plays the critical role in coordinating with Ag+ and Bi3+ cations during the film formation process. As another consequence, the as-fabricated devices have exhibited significantly higher reproducibility for fabrication. By optimizing the amount of CBH, the power conversion efficiency (PCE) relatively increased 37 to 1.57%, which remained 95.0% in an ambient environment for a 1000-h test. Hopefully, this work could facilitate the current technologies in the exploration of high-performance lead-free perovskites such as Cs2AgBiBr6 and better understanding of the mechanism in the additive engineering as well.
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PubMed
高影响因子
Small
·
2023
·
IF 13.3
Xiaoyu Gu,Chengwei Shan,Xiaowei Xu,Qian Liu,Aung Ko Ko Kyaw
All inorganic perovskite based on CsPbI 2 Br has attracted significant attention due to its relatively thermal stable structure compare to its hybrid counterparts. With a wide bandgap of 1.9 eV and excellent light absorption capability, it has been extensively explored for applications in indoor photovoltaics and as a front absorber in tandem devices. However, the uncontrollable crystallization process during solvent evaporation and thermal annealing leads to both macroscopic defects like cracks and microscopic defects such as voids. In this study, a metastable adduct with lead (II) halides by incorporating 4-tert-butyl pyridine as a volatile Lewis base monodentate ligand in the precursor solution is formed. The strategic preferential decomposition of the adduct during the early-stage low-temperature annealing facilitated the desorption of lead (II) halides, inducing antisolvent-free heterogenous nucleation. This, in turn, promoted crystal growth during subsequent high-temperature annealing, resulting in dense films with low defect density. As a result, a maximum open-circuit voltage of 1.30 V is achieved with the champion power conversion efficiency of 16.5% in CsPbI 2 Br-based perovskite solar cell. The work reveals a new mechanism of using Lewis acid-base adduct to obtain high quality perovskite films other than hindering crystallization in traditional way.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12392-12399
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IF 6.4
Liting Tao,Wei Tang,Minxing Yan,Li Ding,Jiajun Wei,Lixiang Wang,Liqi Li,Linjun Li,Deren Yang,Yanjun Fang
2D Ruddlesden–Popper perovskites with chiral organic ligands are emerging as promising candidates for circularly polarized light (CPL) detection, which has important applications in quantum communication and opto-spintronics. However, the insulating organic spacers in 2D perovskites generally hinder carrier transport and charge extraction, hence leading to a low responsivity of photodetectors. Herein, we have prepared a chiral-2D/3D perovskite heterojunction thin film via intermittent spin-coating of the chiral-2D ligands on top of a 3D perovskite film. The chiral-2D perovskite formed on top of the film functions as the CPL absorption layer, while the energy transfer between chiral-2D and 3D perovskites and the dissociation of excitons in the 3D phase facilitate the efficient lateral carrier transport and extraction in the bottom 3D perovskite-based charge transport channel. The resultant heterojunction CPL detectors exhibit a high anisotropy factor of 0.13 and a large specific detectivity of above 6.8 × 1010 Jones that significantly outperform those of the pure chiral-2D based ones, which paves the way for the design and preparation of high performance perovskite thin film-based CPL detectors.
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 29
·e202301223
·
IF 2.1
Yingwei Li,Shengxin Chen,Ying Jin,Xinxin Li,Ruirui Zhang,Ruixia Liu
Graphical A simple and controllable defect construction method for vanadium-oxygen catalysts through hydrogen reduction with TCD detector were used to control the reduction state of CHR-VOx which determines the V-Species and O-Species. Furthermore, the structure-performance relationship and the catalytic pathway were assumed, multi-liganded-oxygen and V 4+ species are the key parameters. A series of controlled-hydrogen-reduction VO x (CHR-VO x ) were prepared after our controllable hydrogen treatment, and CHR-VO x were controlled to be reduced to the states dominated by V 5+ and V 4+ species, subsequently the catalytic roles of V-species and O-species for cyclohexane (CHA) oxidation were explored. As expected, the surface properties of CHR-VO x have occurred remarkable change resulting in a significantly improvement on catalytic performance determined by V-species and O-species. The reduction behavior of the properties was recognized by XPS and Raman. Generally, the moderate-reduced CHR-VO x which possessed most 78.7 % multi-liganded-oxygen ( L O) performed the best conversion for CHA (11.8 %), and the over-reduced CHR-VO x with a large content of V 4+ species (33 %) performed a best selectivity for adipic acid (44.3 %). In this case, L O sites were regarded as the active site to accelerate the activation of CHA, while V 4+ species were regarded as the oxygen vacancies (OVs) through V 4+ −OV to contribute to the further oxidation to adipic acid.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 37
·20225-20233
·
IF 11.9
Pengjie Hang,Chenxia Kan,Ge Li,Jiangsheng Xie,Biao Li,Yuxin Yao,Degong Ding,Zechen Hu,Deren Yang,Xuegong Yu
Copper(I) thiocyanate (CuSCN) is an extremely cheap and intrinsically stable p-type hole transport material which is attractive for solar cell applications. However, its devices exhibit poor stability due to the severe degradation at the CuSCN/metal-electrode interface and the origin is still unclear. Herein, the underlying degradation mechanism at CuSCN/metal (including Au, Ag and Al) interfaces is well unveiled, and metal electrodes induce the self-disproportionation reaction of Cu+ in CuSCN (Cu+ = Cu0 + Cu2+) through the alloying of Cu/metal, contributing to the interfacial degradation. This process in devices is spontaneous and sharply accelerated under the electric field, namely actual operation state. Thus, the metal electrode was replaced by a chemically stable carbon electrode to overcome the interface degradation, enabling efficient and stable n–i–p perovskite solar cells. Our finding uncovers the secret of degradation at the CuSCN/metal-electrode interface and provides an insight into the potential application of CuSCN in photoelectric devices, especially in solar cells.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 47
·2305858
·
IF 19
Shuangyi Zhao,Zhenglin Jia,Yian Huang,Qingkai Qian,Qianqian Lin,Zhigang Zang
Lead-free metal halides have recently received sustained attention because of their nontoxicity, low-cost, as well as excellent stability and optoelectronic properties. However, most of the reported lead-free metal halides are synthesized via slow solution-processing at high temperature in toxic solvents, which may impede their commercial applications. Here, a solvent-free strategy is proposed to synthesize inorganic rubidium copper halides (Rb 2 CuX 3 , X = Cl, Br) at room temperature, which exhibit efficient violet emission dominated by a self-trapped excitons (STEs) mechanism and attractive stabilities against ultraviolet illumination and heating. Thus, Rb 2 CuX 3 powders are employed as emitters and scintillators applied in wireless light communication and X-ray imaging technologies. Under orthogonal frequency division multiplexing modulation, emitters demonstrate a broad −3 dB bandwidth of 26.3 MHz and a high received data rate of 205.1 Mbps. Additionally, flexible scintillation films based on as-prepared powders are fabricated and show outstanding X-ray scintillation properties, including a high spatial resolution of 18.1 lp mm −1 and a low detection limit of 104 nGy air s −1 , as well as promising imaging performance for irregular objects. These results suggest large-scale production of nontoxic Rb 2 CuX 3 and their potential commercialization in fields of high-speed light communication and X-ray radiography.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yue Zhao,Shujie Jiao,Shuo Liu,Yimin Jin,Song Yang,Xianghu Wang,Tong Liu,Hongyan Jin,Dongbo Wang,Shiyong Gao,Jinzhong Wang
All-inorganic metal halide perovskite is considered as one of the most promising perovskite materials for photodetectors , because of its remarkable optoelectronic characteristics and stability. Whereas, it remains challenge to achieve both excellent photodetection performance and stability due to the multitudes of defects in perovskite films. Herein, an interface engineering based on surface passivation strategy to achieve high-quality CsPbBr 3 perovskite films by introducing thioacetamide (C 2 H 5 NS, abbreviated as TAA) as interface materials is reported. The interaction between TAA and perovskite passivates the uncoordinated Pb 2+ on the surface of CsPbBr 3 film, suppress carrier non-recombination and accelerates carriers transfer. The self-powered photodetector based on the passivated CsPbBr 3 film prefers the maximum responsivity of 0.26 A W −1 and detectivity of 8.39 × 10 12 Jones under 520 nm irradiation. In addition, the optimized photodetector exhibits excellent stability and maintains more than 98% of its initial photocurrent when operating over 8 h. This work demonstrates an alternative approach for the preparation of improved performance in CsPbBr 3 perovskite photodetectors and associated photoelectric devices.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yu-Qi Sun,Jie Wang,Guang-Zhe Ma,Dong Shi
Photoluminescence is informative to other optoelectronic processes that are less directly accessible in metal halide perovskites . In this study, we conducted optical studies on CH 3 NH 3 PbBr 3 single crystals with robust cubic lattices and atomically flat surfaces. Inter-band luminescence peaking aside from the absorption cutoff was observed, and its shifts toward shorter wavelength upon cooling. Cooling the crystal below 150 K leads to the occurrence of mid-gap luminescence partly at the expense of the inter-band luminescence, which indicates bulk photoluminescence quenching by trap-mediated electronic trapping and subsequent mid-gap radiation following electronic de-trapping. Time-resolved photoluminescence probed at the mid-gap luminescence maxima shows two-stage mono-exponential traces, directly corroborating the trapping and de-trapping processes. In the presence of mid-gap luminescence at low temperatures, time-resolved inter-band luminescence demonstrates triplet decaying pathways, in sharp contrast to the doublet decaying pathways at higher temperatures in the absence of mid-gap luminescence. Time- and temperature-resolved inter-band photoluminescence gave rise to a characteristic photocarrier lifetimes evolution against temperature in a close analogy to the material's dielectric constant .
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