ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenyu Zhang,Xiaojie Liu,Benlin He,Zekun Gong,Jingwei Zhu,Yang Ding,Haiyan Chen,Qunwei Tang
The defect passivation of perovskite films is an efficacious way to further boost the power conversion efficiency (PCE) and long-term stability of perovskite solar cells (PSCs). In this work, ionic liquids (ILs) of 1-butyl-2,3-dimethylimidazolium chloride ([BMMIm]Cl) are used as a modification layer in perovskite films in carbon-based CsPbBr3 PSCs without a hole-transporting material (HTM) for passivating the surface defects. The preliminary results demonstrate that the [BMMIm]Cl modifier passivates the surface defects of the perovskite film and reduces the valence band of perovskite close to the work function of the carbon electrode, which causes a remarkably inhibited nonradiative and radiative charge recombination, improved energy-level matching, and decreased energy loss. After optimization, a champion efficiency of 9.92% with a Voc as high as 1.61 V is achieved for the [BMMIm]Cl tailored carbon-based CsPbBr3 PSC without HTM, which is improved by 61.3% in comparison with 6.15% for the control device. Furthermore, the encapsulation-free PSC presents good long-term stability after storage in an air atmosphere with 70% RH at 20 °C or 0% RH at 80 °C as well as under continuous illumination conditions for 30 days. The significantly improved PCE and stability in high humidity or temperature suggest that the perovskite passivation by ILs is an effective strategy for fabricating high-PCE and stable PSCs.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 15
·2267-2277
·
IF 2.7
Yang He,Yangjie Li,Han Wang,Site Luo,Haihu Yu
The weakly bound organic ligand shells around perovskite quantum dots (QDs) are easily decomposed and cannot provide sufficient stability in polar solvents, which greatly obstructs their applications in sensing. Herein, a fluorescent sensor based on CsPbBr3/CdS core/shell QDs was developed for the detection of tetracycline (TC) in the polar solvent-ethanol. Pristine CsPbBr3 QDs were treated with cadmium diethyldithiocarbamate (Cd(DDTC)2) to form a shell on the surface at 110 °C, while extra oleylammonium bromide (OAmBr) was added to inhibit the phase transformation of CsPbBr3 into a Cs4PbBr6 impurity phase during high-temperature processing. And finally CsPbBr3/CdS core/shell QDs were successfully synthesized. The capping with the CdS inorganic shell remediated surface defects and improved the stability in ethanol without affecting the emission properties of the parent CsPbBr3 QDs. The results showed that the fluorescent sensor detected TC in the range of 0.05–25 μM with a low detection limit of 22.6 nM, whereas it had high selectivity and anti-interference ability for TC. And the fluorescence quenching mechanism of the sensor was mainly photoinduced electron transfer between TC and CsPbBr3/CdS QDs. Our research provides a unique way to improve the stability of perovskite QDs in polar solvents and applications in fluorescence detection.
研究领域:
材料科学
·
分析化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Zhentong Lu,Zhiqiang Tang,Haoran Zhang,Wei Li,Jianle Zhuang,Chaofan Hu,Yingliang Liu,Bingfu Lei,Xuejie Zhang
In situ precipitation of CsPbBr 3 quantum dots within glass (CsPbBr 3 QDs@galss) is considered as one of the effective methods to overcome their instability and achieve practical applications. However, challenges such as low photoluminescence quantum yield (PLQY), poor thermostability and photostability still persist. Herein, we modulated the rigidity of the glass network structure by adjusting the SiO 2 content in the phosphate glass matrix. This strategy allowed us to successfully fabricate CsPbBr 3 QDs@glass composites with excellent crystallinity and luminescence properties. This composite exhibits a narrow-band emission at 515 nm with a remarkable PLQY up to 72 % under 455 nm excitation, 1.7 times higher than that of unintroduced SiO 2 . Moreover, it retains approximately 30 % of its initial luminescence intensity even at a high temperature of 373 K. Meanwhile, the fabricated green LED maintains its luminescence intensity at about 93 % of the initial value after 120 h of continuous operation. To demonstrate its conceptual application, an LCD screen was also assembled using a white LED lighting strip based on CsPbBr 3 QDs@glass that shows outstanding color reproduction and color saturation.
研究领域:
材料科学
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光学工程
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显示技术
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 17
·4359-4368
·
IF 7.779
Guiqiang Wang,Jiayu Bi,Jiarun Chang,Miao Lei,Huiling Zheng,Yu Yan
Narrowing the bandgap and promoting the quality of inorganic perovskites are the key points to improve the performance of inorganic perovskite solar cells. Herein, we incorporate Sn2+ into an inorganic CsPbBr3 perovskite to simultaneously tune the bandgap and improve the quality of the perovskite film. The density functional theory calculations demonstrate that the incorporation of Sn2+ leads to an obvious shift of the conduction band minimum of the CsPbBr3 perovskite towards the lower energy region. Therefore, the bandgap of CsPb1−xSnxBr3 perovskites is gradually reduced with the increase of the Sn2+ content. Additionally, when Pb2+ is substituted with an appropriate amount of Sn2+, the doped perovskite films display largely promoted quality compared to the undoped one. These advantages lead to the suppression of charge recombination and the enhancement of light harvesting in the as-fabricated perovskite solar cells (PSCs). Consequently, the CsPb0.95Sn0.05Br3-based PSC with a structure of FTO/TiO2 layer/perovskite/carbon delivers a greatly promoted power conversion efficiency of 8.04% compared with the efficiency of 5.93% for the controlled device. Moreover, the CsPb0.95Sn0.05Br3 PSC without any encapsulation preserves over 91% of its initial efficiency after 720 h of storage in ambient air, suggesting an excellent stability.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
NANO
·
2020
·
IF 1.566
Zhuang Liu,Jianlin Chen,Caiyou Huang,Too Gideon Kiprono,Wusong Zhao,Wei Qiu,Zhuoyin Peng,Jian Chen
In this paper, three kinds of SnO 2 precursors were comparatively investigated for low temperature solution-processed SnO 2 films as electron transport layers (ETL) of CsPbBr 3 perovskite solar cells (PSCs). It was found that the precursor state and solvent type played an important role on the crystallinity and film-forming performance of SnO 2 . All-inorganic hole-transport-layer-free planar CsPbBr 3 PSCs with an architecture of FTO/SnO 2 /CsPbBr 3 /carbon were fabricated. The best-performing device with SnO 2 as ETL by reflux condensation sol spin-coating technique delivered a champion power conversion efficiency (PCE) as high as 6.27%, with a short-circuit current density of 7.36 mA cm − 2 , an open-circuit voltage of 1.29 V, and a fill factor of 65.9%. It was comparable to the highest PCE record 6.7% of the device with the same structure based on TiO 2 -ETL so far. Moreover, the CsPbBr 3 devices without encapsulation exhibited good stability after being stored under ambient conditions with a relative humidity of ∼ 4 0 % at room temperature over 1000 h and 60 ∘ C for 720 h, respectively. The results promise the commercial potential of CsPbBr 3 PSCs using reflux condensation low-temperature solution-processed SnO 2 as ETLs for flexible polymer photovoltaic applications.
研究领域:
材料科学
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能源科学
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光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Hongyu Liu,Yue Zhang,Shuo Song,Xinxin Guo,Liwei Wang,Qiang Fu,Wenzhi Wang
CsPbBr 3 perovskite quantum dots (PQDs) have been considered as potential luminescent materials for lighting and display applications. The oleylamine (OLA) is usually considered to be an indispensable surface ligand in the synthesis of PQDs. However, the long-chain amines can cause more surface defects, resulting in the poor stability and optical performance, which will greatly limit its practical application. Herein, the n-amylamine (ALA) with short carbon chain has been chosen to replace the OLA as surface ligand to synthesize the CsPbBr 3 PQDs. Under the synergic action of oleic acid (OA), ALA-CsPbBr 3 PQDs with enhanced air/thermal stability and optical properties can be obtained through a modified hot-injection method. The ALA-CsPbBr 3 PQDs possess highly monodisperse cubic morphologies (∼10 nm edge lengths), which are similar to the OLA-CsPbBr 3 PQDs. Meanwhile, ligand substitution does not alter the crystal structure, and maintain the cubic crystal structure of CsPbBr 3 . The synthesized ALA-CsPbBr 3 PQDs exhibits a PLQY of 91.3 %, significantly higher than that of OLA-CsPbBr 3 (70.42 %). Photo-stability test indicates that ALA-CsPbBr 3 PQDs are markedly more stable than OLA-CsPbBr 3 PQDs, owing to the passivation of the surface defects. Furthermore, the activation energy of ALA-CsPbBr 3 PQDs (570.8 meV) is higher than OLA-CsPbBr 3 PQDs (495.4 meV), indicating the ALA-CsPbBr 3 PQDs have the much higher thermal stability. In addition, the ALA-CsPbBr 3 PQDs can also be efficiently excited by X-rays, showing a linear response to X-ray radiation, and have good X-ray imaging capability. The CsPbBr 3 PQDs with enhanced stability and optical properties, which are modified by short carbon-chain surface ligands, can further strengthen the competitiveness of PQDs for optoelectronic device applications.
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高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 7
·2246-2255
·
IF 6.8
Dai Yan,Chen Gengxu,Huang Weilong,Xu Chenhui,Liu Changfei,Huang Ziyu,Guo Tailiang,Chen Huipeng
Artificial photonic synapses offer an efficient solution for overcoming the von Neumann bottleneck in data storage and processing, providing advantages over electrical synapses by eliminating the bandwidth-connection-density tradeoff and exhibiting low power consumption. Perovskite quantum dots (QDs) have garnered significant attention in artificial photonic synapses due to their facile synthesis and favorable optoelectronic properties. However, challenges such as limited carrier mobility and nonlinearity impede their performance in neuromorphic applications. In this study, CsPbBr 3 -attached MXene nanostructures (CsPbBr 3 -MXene), in-situ growth of CsPbBr 3 QDs on MXene nanosheets, were proposed as the light-absorbing layer of a synaptic phototransistor. The heterostructure formed by CsPbBr 3 and MXene enhances photocurrent generation. Comparative analyses between CsPbBr 3 -MXene synapse transistor and that containing only CsPbBr 3 revealed a 24.6% higher excitatory postsynaptic current (EPSC) in the CsPbBr 3 -MXene one under identical light pulse stimulation. Following calculations and comparisons, the linearity exhibited significant improvement, decreasing from 4.586 to 1.099. Furthermore, the recognition accuracy in handwritten digit classification notably increased, rising from 86.13% to 92.05%. Moreover, the F1 score in edge detection had improvement, advancing from 0.8165 to 0.9065, approaching closer to 1. These improvements have demonstrated substantial assistance in the field of neural computing.
研究领域:
材料科学
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神经形态工程
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光电技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhenyu Li,Huifeng Deng,Yu Jiang,Jianbin Ju,Xiaowen Huang,Lang Zhang,Guihua Ruan,Zhengyi Chen,Yipeng Huang
Portable fluorescence-based Cs + radionuclide sensing has received great concerns yet challenged by interference in complex sample matrices. Herein, a reliable method was established by in situ converting the preconcentrated Cs + to CsPbBr 3 perovskite nanocrystals in mesoporous silica modified with dibenzo 24-crown-8 ethers (DB24C8E-SiO 2 ), which combined the selective extraction of Cs + with in situ fluorescence derivatization to achieve good anti-interference ability. The high adsorption capacity (49.5 mg g −1 ) of DB24C8E-SiO 2 for Cs + and elution-free operation enabled enrichment factor up to 4500, which was conducive to reducing the limit of detection (LOD) for Cs + . By this method, the fluorescence intensity linearly increased with the Cs + concentration from 0.050 μg mL −1 to 100 μg mL −1 with an LOD of 0.017 μg mL −1 (S/N = 3). The concentration of Cs + in seawater sample was detected to be 0.056 μg mL −1 . The recoveries of Cs + in spiked samples remained above 88.90 % and the relative standard deviations were less than 12.06 %. In addition, the relative errors of this method were within ±13.2 % compared with the result from atomic absorption spectrometry. The study demonstrated the high potential of the method for removal and portable detection of Cs + .
研究领域:
分析化学
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环境科学
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材料科学
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DOI
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 14
·25023-25035
·
IF 3.2
Jinxiao Hu,Shuyi Ning,Chaoqi Hao,Zheng Ren,Cong Li,Fenghe Wang,Guoyi Dong,Gang Yue,Li Guan,Li Guan,Xu Li,Xu Li,Zhenyang Liu,Zhenyang Liu
All-inorganic lead halide perovskite nanocrystals (NCs) have excellent optoelectronic properties and promising applications. Improving the stability of inorganic halide NCs and optimizing their photoluminescence quantum yields (PLQY) has become an urgent task. Constructing core-shell structures is an effective method to improve the environmental stability and PLQY, however, realizing core-shell structured perovskite NCs with good dispersion and multiple perovskites encapsulated within the shell material remains challenging. In this work, CdS shells were grown on the surface of CsPbBr3 NCs by ion-exchange method utilizing perovskite NCs with their ionic properties, and the effectiveness of the surface shell protection is reflected in its enhancement of long-term storage stability, storage stability in water, and thermal stability of NCs. In addition, the PLQY and exciton binding energies of CsPbBr3/CdS NCs are increased. Finally, the NCs were packaged into green emitting LED devices and performed high stability. The results will facilitate the further commercialization of all-inorganic lead halide perovskite materials for optoelectronic devices.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 6
·期 12
·2100654
·
IF 7.848
Ze Wang,Yaqian Zhang,Xiaodong Liu,Yanxia Yu,Fucai Xu,Jing Ding,Xiaojuan Liang,Keqin Yang,Weidong Xiang
In this study, a simple low-temperature self-assembly strategy is used to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepared CsPbBr 3 /Cs 4 PbBr 6 nanocomposite exhibits the reversible luminescence phenomenon by simply applying the wetting and drying process. This abnormal phenomenon is due to the internal phase transformation of the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite. The potential application of the nanocomposite in anti-counterfeiting has been demonstrated. This work facilitates the production and application of inorganic metal halide perovskite-based functional materials.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Shibo Wang,Fengxian Cao,Weihai Sun,Chunyan Wang,Zhongliang Yan,Nan Wang,Zhang Lan,Jihuai Wu
All-brominated inorganic perovskite CsPbBr 3 has received much attention in the field of optoelectronic applications owing to its superb stability and ease of manufacture under the ambient condition. However, the tedious process and toxic solvent are two major challenges for fabrication of CsPbBr 3 films via a multi-step deposition method . Here, we demonstrate a sustainable bi-solvent system for preparing high-quality CsPbBr 3 films in a triple-step solution-processed route, where the bi-solvent system comprises of green solvent water and ethylene glycol monomethyl ether (EGME) in place of the noxious methanol for CsBr solution. By adjusting the temperature of heat treatment and spin-coating speed, the pinhole-free, ultra-smooth and high crystallinity of CsPbBr 3 films were obtained. As a result, the CsPbBr 3 PSC prepared from the green bi-solvent system demonstrates an optimal power conversion efficiency (PCE) of 9.55%, which is one of the highest efficiencies for planar carbon-based PSCs without hole transport layer. Moreover, the all-inorganic unpacked PSCs exhibit excellent humidity stability under ambient environment for 34 days. Our result not only offers a facile and simple way to fabricate the pure-phase CsPbBr 3 films, but also alleviates the solvent toxicity during the preparation of CsPbBr 3 PSCs.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junyang Yin,Feng Wu,Jiangnan Dai,Changqing Chen
Perovskite quantum dots (PQDs) are emerging as promising nanomaterials for optoelectronic applications. However, developing a cost-effective green synthesis process that simultaneously possesses satisfactory photoluminescence quantum yield (PLQY) and stability remains a severe challenge. Here, CsPbBr 3 @PbSO 4 nanocomposites with a near-unity PLQY of 99.8 % and robust ambient stability are synthesized in situ in water via 4-Bromobenzenesulfonic acid and ditetradecylamine ligands. Notably, these nanocomposites show no decline in PLQY even after being immersed in water for over 250 days, and also exhibit superior stability against heating, ultrasonication, UV irradiation, anion exchange, and erosion by polar solvents. First-principles calculations reveal that CsPbBr 3 @PbSO 4 nanocomposites can form a natural quantum well structure, which effectively promotes the radiative recombination of carriers in CsPbBr 3 QDs. Meanwhile, the remarkable stability is attributed to the ultrahigh decomposition enthalpy of PbSO 4 that serves as a strong barrier preventing the invasion of anions and polar media into the embedded CsPbBr 3 QDs. Finally, besides the convenient application of green fluorescent paper, a fingerprint recognition is demonstrated by fabricating a bright-green LED integrated with the CsPbBr 3 @PbSO 4 nanocomposites powder and a commercial UV chip. This work provides a new strategy for green synthesis and practical application of high-efficient and ultrastable PQDs.
研究领域:
材料科学
·
光学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）