Journal of Physical Chemistry C
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2023
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IF 3.7
Jifeng Yuan,Jianjun Tian
Perovskite quantum dots (PQDs) have gained significant attention due to their exceptional optical and electronic properties, rendering them promising materials for various optoelectronic applications, such as single-junction solar cells because of the multiple exciton generation effects. To improve the electrical properties of CsPbI3 PQDs, ligand engineering was explored by introducing short-chain ligands to exchange the original long-chain ligands on the PQD surface during the purification process. However, the short-chain ligands suffer from low solubility in the anti-solvent, resulting in insufficient ligand exchange. To address this issue, we developed an in-situ ligand exchange (ILE) strategy to promote the replacement of long-chain ligands with short-chain ones, leading to improved surface chemistry. In this work, 4-methoxyphenethylammonium iodide (CH3O-PEAI) was demonstrated as the short-chain ligand in the ILE strategy, thereby modifying halide vacancy trap states, and promoting carrier transportation and extraction. As a result, the ILE-CsPbI3-based solar cells achieved a higher power conversion efficiency of 14.4% with a high open circuit voltage (VOC) of 1.23 V and exceptional long-term durability due to higher hydrophobicity.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Jianyong Pan,Jingyang Hu,Xinning Dong,Yuhui Wang,Xiaoyu Zhang,Martyn A. McLachlan,Zhongrui Wang,Jiaqi Zhang,Lijun Zhang
Memristors based on perovskite materials demonstrate significant potential for applications in information encryption and storage. However, the stability and durability of their device structures remain major challenges for commercial deployment. In this study, Mn:CsPbCl 3 perovskite nanocrystals capped with short-chain ligands are synthesized at a controlled ratio using an in situ ligand passivation strategy. Compared with long-chain ligands, short-chain ligands possess higher surface adsorption energy, which enhances nanocrystal size uniformity and enables more effective attachment to the perovskite surface at adsorption sites. This process mitigates surface defects in the nanocrystals, thereby decreasing the randomness in conductive filaments formation and enhancing device stability. Furthermore, short-chain ligand capping improves the contact at the material-electrode interface correspondingly reducing leakage current. The fabricated short-chain Al/Mn:CsPbCl 3 /FTO memristor exhibits good reconfigurable storage behavior. By adjusting the compliance current, a transition from non-volatile to volatile storage modes is successfully achieved. Leveraging the device's electrical characteristics, binary image encryption, and storage functions are realized. Overall, this work demonstrates the importance of surface defects on the operational stability of nanocrystal memristors and provides a foundation for the application of perovskite memristors in information encryption and secure transmission.
研究领域:
材料科学
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信息科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 24
·1900991
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IF 15.621
Keqiang Chen,Qiaohui Zhong,Wen Chen,Binghua Sang,Yingwei Wang,Tingqiang Yang,Yueli Liu,Yupeng Zhang,Han Zhang
Cubic phase CsPbI 3 (α-CsPbI 3 ) perovskite quantum dots (QDs) have received extensive attention due to their all-inorganic composition and suitable band gap (1.73 eV). However, α-CsPbI 3 QDs might convert to δ-CsPbI 3 (orthorhombic phase with indirect band gap of 2.82 eV) due to easy loss of surface ligands. In addition, commonly used long-chain ligands (oleic acid, OA, and oleylamine, OLA) hinder efficient charge transport in optoelectronic devices. In order to relieve these drawbacks, OA, OLA, octanoic acid, and octylamine are used as capping ligands for synthesizing high-quality α-CsPbI 3 QDs. The results indicate that these QDs exhibit excellent optical properties and long-term stability compared to QDs capped only with OA and OLA. Moreover, QDs with shorter ligands exhibit an enhanced charge transport rate, which improves the power conversion efficiency of photovoltaic devices from 7.76% to 11.87%.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
LANGMUIR
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2025
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IF 3.9
Jie Chen,Chenyi Zheng,Qiang Wang,Zhipeng Xu,Kui Meng
Many innovations have been made in the morphology and preparation methods of copper–silver core–shell nanomaterials (Cu@AgNMs). The most commonly used method for preparing Cu@AgNMs is to perform a replacement reaction by adding a complexing agent, but there is no universally accepted method to select a complexing agent. This study found that the best complexing agent for preparing Cu@AgNMs is a short-chain complexing agent containing hydrophilic groups through the role of different complexing agents in the synthesis of the material, and the higher the stability of the short-chain hydrophilic complexing agent, the better the integrity of the resulting silver layer. This study clarifies the mechanism of different complexing agents in the synthesis of Cu@AgNSs, provides a reliable reference for the convenient preparation of Cu@AgNMs, and helps us to understand the influence of complexing agents on the silvering effect of the replacement process, thereby promoting the widespread application of a complex-replacement technology.
研究领域:
材料科学
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纳米技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Mengmeng Yu,Duo Zhang,Yaobin Xu,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Chengchun Tang,Yang Huang
Surface ligand engineering is of great importance for the preparation of one-dimensional (1D) CsPbBr 3 nanowires for high-performance photodetectors. The traditional long-chain terminated ligands such as oleylamine/oleic acid (C18) used in the preparation of CsPbBr 3 nanowires will form an electrically insulating layer on the surface of the nanowires, which hinders the effective transport of charge carriers in optoelectronic devices. In this paper, short-chain ligands, including dodecylamine/dodecanoic acid (C12), octylamine/octanoic acid (C8) and hexylamine/hexanoic acid (C6), are introduced to partially replace long-chain ligands (C18) to successfully prepare various CsPbBr 3 nanowires via a solvothermal method. Microstructure characterization indicates that the four kinds of nanowires before/after surface ligand engineering, which are named as C18-CsPbBr 3 , C12/18-CsPbBr 3 , C8/18-CsPbBr 3 and C6/18-CsPbBr 3 , all have high aspect ratio and purity. As compared with CsPbBr 3 with long-chain terminated ligands, the C8/18-CsPbBr 3 and C6/18-CsPbBr 3 nanowires with shorter chain ligands exhibit superior photoluminescence (PL) performance and stability under adverse conditions such as ultraviolet irradiation and high temperature. The constructed photodetectors based on C8/18-CsPbBr 3 and C6/18-CsPbBr 3 nanowires have shown improved performances. This work provides a new idea for the preparation of CsPbBr 3 nanowires with high optical properties, stability and charge transport, and the prepared CsPbBr 3 nanowires have potential application prospects in optoelectronic devices.
研究领域:
材料科学
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纳米技术
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光电子学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Naqing Wang,Qixin Huang,Zhehong Zhou,Shaojun Wang,Tao Pang,Lingwei Zeng,Daqin Chen
Synthesis of lanthanide-doped perovskite nanocrystals generally utilizes long-chain ligands like oleylamine and oleic acid at high temperatures up to 260 °C. To tackle this issue, we develop a strategy (temperatures down to 170 °C) to fabricate ytterbium (Yb 3+ )-doped CsPbCl 3 perovskite nanocrystals using the octylamine ligand benefited from its low boiling point and short carbon chain. The as-prepared Yb 3+ -doped CsPbCl 3 perovskite nanocrystals can yield both violet luminescence assigned to exciton recombination and near-infrared emission ascribed to Yb 3+ : 2 F 5/2 → 2 F 7/2 . Structural and spectroscopic characterizations evidence that energy transfer from CsPbCl 3 to Yb 3+ and from defect states to Yb 3+ are simultaneously responsible for the observed Yb 3+ luminescence with quantum yield of 49.5 %. Femtosecond transient absorption spectra confirm that the transferring time scale is within 100 ps, which is much faster than the photoluminescent decay lifetimes of 3000 ps, enabling efficient CsPbCl 3 -to-Yb 3+ energy transfer and thus Yb 3+ luminescence.
研究领域:
材料科学
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纳米技术
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光电子学
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无机化学
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光谱学
✓ 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）