Advanced Optical Materials
·
2022
·Vol. 10
·期 11
·2200189
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IF 10.05
Shixu Yang,Chenghao Bi,Wei Dong,Xiaoyu Zhang,Weitao Zheng,Wallace C. H. Choy,Jianjun Tian
Perovskite quantum dot (QD) charging is prone to occur during light-emitting diode (LED) operation due to the electron accumulation inside the QD emitters, which is caused by the unbalanced charge injection and carrier transportation. Here in order to address this issue, an electron attractor of phenethylammonium (PEA + ) is introduced to the surface of perovskite QDs. The PEA + conjugated ligands can reversibly store and release electrons driven by the electron local density of states redistribution, which enhances the delocalization of electrons in QDs, and thus suppresses QD charging at high carrier concentrations, as evidenced by the excitation energy dependent photoluminescence. Besides, PEA + down-shifts the Fermi level of perovskite QDs, consequently increases the hole concentration, leading to greatly improved hole conduction. Halogen-rich synthesis environment also reduces the number of halogen vacancies, consequently narrows the distribution of electronic states at the band edges, leading to slightly improved electron conduction. Taking advantage of the enhanced electron delocalization and improved charge transportation, the CsPbI 3 QDs LEDs show the maximum external quantum efficiency (EQE) of 15.6% with a low efficiency roll-off, and the maximum luminance of 1634 cd m −2 .
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xianhao Min,Qifei Xie,Zhiguo Wang,Xinzhong Wang,Mingxiang Chen
As traditional capping ligands like oleic acid (OA) and oleylamine (OLA) cannot efficiently maintain the optoelectronic properties and stability of iodide perovskite nanocrystals (NCs), post synthesis surface modification with some other ligand is a convenient and valid method to solve these problems to some extent. Here we promote a long carbon chain ligand with a thiol group, 1-Octadecanethiol (ODT), to realize the passivation of the surface of CsPbI 3 NCs after the synthesis process. After modification, our ODT-CsPbI 3 NCs exhibit excellent optical properties with a high PLQY of 93% and outstanding stability under different conditions compared to the untreated samples.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yongsheng Zhu,Jun Zhao,Xueguo Li,Xiumei Xu,Jinshu Huang,Xiaoxu Ji,Gang Yang,Gencai Pan
Here, composites including highly efficient inert shell-modified NaYF4:Yb/Tm@NaYF4 upconversion nanoparticles (UCNPs) and CsPbI3 perovskite quantum dots (PQDs) have been successfully synthesized by the assistance of (3-aminopropyl)triethoxysilane (APTES) as a precursor for a SiO2 matrix. UCNPs and CsPbI3 PQDs in this composite structure show excellent stability in ambient conditions. Importantly, the efficient UC emission of CsPbI3 PQDs was realized, which means that the single red emission of inert shell-modified UCNPs can be easily obtained by depending on these composite structures. Furthermore, the single red emission wavelength can be easily regulated from 705 to 625 nm by introducing appropriate proportion of Br– ions, which is very difficult to achieve for traditional UCNPs. Moreover, benefiting from the efficient downshifting (DS) red emission of CsPbI3 PQDs, the composites possess the dual-wavelength excitation characteristics. So, the excellent dual-mode anticounterfeiting application has been demonstrated. This work will provide a new idea for the development of perovskite-based multifunctional materials.
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SusMat
·
2025
·
IF 21.3
Kun Wang,Sihong Yue,Tianxiang Li,Yu Tong,Jingyuan Tian,Yali Chen,Ziyong Kang,Feng Yang,Hongqiang Wang
Inorganic lead halide perovskites, especially CsPbI 3 , have witnessed significant progress in photovoltaic field due to their outstanding optoelectronic properties and high thermal stability. However, high-performance inorganic perovskite solar cells (IPSCs) are generally realized by strictly controlling the environmental humidity (mostly lower than 40%) during fabrication, which is undesirable for reducing fabrication cost and promoting further industrial production. Herein, a synergistic in situ hydrolysis polymerization strategy through 3,3,3-(trifluoropropyl)trichlorosilane (TFCS) and (3-2-aminoethylamino)propyltrimethoxysilane (AEMS) treatment is reported to prevent water invasion and realize efficient CsPbI 3 IPSCs in highly humid air. TFCS not only regulates the crystallization process via hydrolysis reaction, but also stabilizes the phase structure by passivating the defects and producing a hydrophobic protection layer. Additionally, TFCS facilitates in situ polymerization of upper layer AEMS, thus promoting further enhanced protection of perovskites against ambient moisture. As a result, the CsPbI 3 IPSCs fabricated at 45% humidity exhibit a dramatically improved efficiency of 20.09%, representing a record value for the inverted IPSCs fabricated in air with humidity over 40%. Moreover, the environmental humidity window for device fabrication can be broadened to 60%. This work provides an effective approach to stabilizing air-processed CsPbI 3 and favoring the practical industrial manufacture to further boost their cost-effective applications.
研究领域:
光伏技术
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材料科学
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纳米技术
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化学工程
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固态电子学
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Rufeng Wang,Jian Ni,Jiayi Guan,Shuai Zhang,Miao Yan,Sen Li,Yaofang Zhang,Juan Li,Hongkun Cai,Jianjun Zhang
All-inorganic CsPbI3 perovskite quantum dots (PQDs) have emerged as promising lighting absorptions for solar cells due to their extraordinary optoelectronic properties and good solution-processability. However, the insulated and dynamic binding characteristics of long-chain ligands on the CsPbI3 PQD surface still challenge their photovoltaic efficiency and stability. Herein, an effective solution-ligand-exchange strategy is developed to modify the surface chemistry of the CsPbI3 PQD utilizing 5-aminopyridine-3-carboxylic acid (5A-3C) during the purification process. Systematic analyses reveal that 5A-3C serves as the multifunctional short-chain ligand to exchange long-chain ligands and is strongly bonded to the CsPbI3 PQD surface, thus facilitating the electronic coupling between neighboring PQDs to promote carrier transport ability. Meanwhile, 5A-3C reduced vacancy defects of the PQD surface and suppressed carrier nonradiation recombination in solar cells. Accordingly, the CsPbI3 PQD solar cells with 5A-3C treatment exhibit a champion power conversion efficiency (PCE) of 15.03%, significantly higher than that of the control device (13.45%). The operation stability of unencapsulated devices has also been significantly improved. This work offers a deep understanding of PQD surface chemistry and provides a feasible avenue to realize high-performance PQD solar cells.
研究领域:
材料科学
·
光电子学
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能源科学
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Small
·
2025
·Vol. 21
·期 8
·2408422
·
IF 12.1
Aleksandr P. Litvin,Jie Guo,Jianxun Wang,Xiaoyu Zhang,Weitao Zheng,Andrey L. Rogach
Metal halide perovskite nanoplatelets (NPls) possess ultra-narrow photoluminescence (PL) bands tunable over the entire visible spectral range, which makes them promising for utilization in light-emitting diodes (LEDs) with spectrally pure emission colors. This calls for development of synthetic methods toward perovskite NPls with a high degree of control over both their thickness and lateral dimensions. A general strategy is developed to obtain such monodisperse CsPbI 3 NPls through the control over the halide-to-lead ratio during heating-up reaction. The excess of iodine precursor changes the chemical equilibrium, thus yielding monodisperse (3 monolayers in thickness) CsPbI 3 NPls whose PL width constitutes ≈22 nm, while the lateral dimensions of NPls are determined by choice of precursor and by the reaction temperature. Postsynthetic cation exchange on the A-site of the perovskite lattice allows for the tuning of the PL peak position, while simultaneous removal of the excess ligands and the surface passivation allows for improvement of the PL quantum yield to 96% and ensures superior stability of optical properties upon storage. Electroluminescent LEDs with the peak values are fabricated for the external quantum efficiency and luminance being 9.45% and 29800 cd m −2 , respectively, and a narrow (≈26 nm) electroluminescence peak at 601 nm.
研究领域:
材料科学
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光电工程
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化学合成
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Wang,Chenyu Shang,Qiqi Zhao,Qi Huang,Chenyang Liu,Wenli Xu,Rui Liu,Weiwei Zhang,Jianxu Ding
Cubic α-CsPbI3 is recognized as one of the most promising semiconductors for optoelectronic applications owing to its suitable band gap, excellent optoelectronic performance, and thermal stability. However, its phase instability from α to δ poses a significant obstacle for practical applications. How to stabilize α-CsPbI3 becomes a paramount issue. Here, we propose a strategy in which α-CsPbI3 nanocrystals (NCs) are in situ generated in the Cs4PbI6 single-crystal (SC) matrix through I ion migration, facilitated by its ultralow activation energy (0.104 eV). The existence of the I vacancy can promote ion migration and can increase the content of α-CsPbI3. As α-CsPbI3 NCs are generated in situ, the light yellow Cs4PbI6 SCs convert to black. The lattice of Cs4PbI6 twines outside of α-CsPbI3 NCs without a grain boundary and restricts the migration of I and Cs within the α-CsPbI3 lattice. This mechanism effectively stabilizes α-CsPbI3 for over 2 years without experiencing a phase transition. Such stable α-CsPbI3 NCs exhibit deep red emission (700 nm), a high exciton binding energy (55.5 meV), and a long carrier lifetime (176.9 ns). Furthermore, annealing at 320 °C for 12 h did not result in any damage. Additionally, white-light-emitting diodes (WLEDs) were fabricated using black Cs4PbI6 SCs and yellow phosphor YAG:Ce3+ under an atmospheric environment and realized white emission. The WLEDs maintain approximately 86% luminescence after 18 days or under continuous operation for 12 h, demonstrating high stability and eliminating the need for short-wavelength blue chips. Overall, the α-CsPbI3 NCs deviating from Cs4PbI6 SCs offer an approach to realize highly efficient light-emitting diode applications.
研究领域:
材料科学
·
光电技术
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ACS Nano
·
2024
·
IF 15.8
Huili Wei,Xiangyu Ji,Jinguo Cao,Wuguang He,Hong Liu,Zexun Pan,Xin Song,Qiang Sun,Jinhua Li,Congcong Wu
The selection of photoactive materials and the design of device structures are critical to the photoelectronic performance of photodetectors. This study reports on a vertically structured photodetector device with rapid, stable, and efficient photoelectric performance across the UV–visible broadband range based on the Si++/SiO2/Au/single-layer graphene/CsPbI3 quantum dots (QDs) configuration. In this specific device structure, a relatively high conductivity Si++/SiO2 wafer was used as the substrate, a CsPbI3 QD film with high light absorption was used as the photoactive layer, and a monolayer graphene with high conductivity was inserted between the substrate and the CsPbI3 QD film to form a heterojunction with the QD film. Based on the Frenkel–Poole emission effect arising from the high trap state density within the SiO2 layer, the device exhibited excellent photoelectric performances. Especially at a wavelength of 365 nm, a photocurrent responsivity of 2319 A/W, a specific detectivity of 1.15 × 1014 Jones, an external quantum efficiency of 7883%, and an on/off time of 39/36 ms at a Si++ terminal voltage of −80 V and an optical power density of 84.03 nW/cm2 can be achieved.
研究领域:
材料科学
·
光电子学
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Xin Zhang,Yiyuan Tang,Lvming Qiu,Kaifeng Liao,Chenghua Sun,Donal D. C. Bradley,Paul N. Stavrinou,Zhen Wu,Jingsong Huang,Guojie Wang
Perovskite nanocrystals (NCs) demonstrate exceptional potential as emitters to address Rec. 2020 standards for wide color gamut displays. However, the pure-red-targeted CsPbI 3 NCs generally suffer from imprecise synthetic control over emission wavelength and from structural instabilities that significantly diminish performance. We report a novel halogen engineering framework that addresses the otherwise unfavorable wavelength-efficiency-stability nexus. Our approach leverages surface I − ···I 2 interactions to simultaneously unlock exceptional optical characteristics and the elusive structural robustness needed for application. It achieves: (i) controlled quantum-confinement-tuned emission wavelength, (ii) near-unity photoluminescence (PL) quantum yield through iodide vacancy defect management, and (iii) excellent environmental stability, even under harsh (85°C/85%) temperature and humidity conditions, through lattice-distortion suppression. Rec. 2020 compliant, 638 nm peak light-emitting diodes (LEDs) are then demonstrated with Commission Internationale de l'Éclairage coordinates (X, Y) = (0.703, 0.297), 22% external quantum efficiency, luminance ≥ 11,000 cd m −2 , and long lifetime, establishing a materials-by-design paradigm for advancing next-generation perovskite display technologies.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jin Huang,Huiya Cao,Kaiyuan Gou,Siyu Chong,Yufan Zhou,Jingru Zhang,Shuya Ning,Shengzhong (Frank) Liu
Uncontrolled crystallization and severe interfacial recombination stifle the lifespan and efficiency of all-inorganic CsPbI 3-x Brₓ perovskite solar cells. Therefore, this work introduces an aniline hydrochloride derivative additive, Benzenamine, N-[(2Z)-2-chloro-3-(phenylamino)-2-propen-1-ylidene]-, hydrochloride (BN), to improve the photoelectric performance and stability of the CsPbI 3-x Br x perovskite solar cells. The imine (C=N) groups coordinate with lead-related defects, the -NH 3 + groups form hydrogen bonds with halides, while the C Cl groups enhance lattice stability through electrostatic interactions. In addition, the aromatic skeleton in the BN molecule promotes ordered π-π stacking of molecules at the interface, which not only reduces surface energy but also constructs a hydrophobic protective layer. The optimized BN-based device achieved a maximum efficiency of 21.12%, significantly higher than the 17.27% of the control device. Furthermore, the optimized, unencapsulated device retained 95.6% of its initial efficiency after 1000 h of aging, demonstrating excellent environmental stability. This work validates the potential of aniline hydrochloride derivatives as highly efficient molecular modulators and provides a novel design approach for interface engineering in all-inorganic perovskite photovoltaic devices.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiangyan Li,Quanling Jiao,Liangyu Zhai,Abulikemu Abulizi,Anwar Mamat
Due to their unique photoelectric properties, perovskite quantum dots (PQDs) are of growing interest. The preparation of pure red-emitting perovskite materials is a key step to achieve a full-color display. To date, the precise growth mechanism of CsPbI3 QDs under thermodynamic equilibrium control remains unexplored. We reveal the regulation of reaction parameters on the nucleation and confined growth of pure-red CsPbI3 strongly confined quantum dots (SQDs). Key intermediate perovskite nanoclusters in the formation of SQDs were revealed, and the effects of the ligands and temperature on their growth pathway were systematically investigated. By adjusting the reaction parameters, such as the ligand concentration, ratio, and temperature, control over size, size distribution, and phase (CsPbI3 or Cs4PbI6) can be achieved. Furthermore, our findings shed light on the solubility of PbI2 in this iodine-rich synthesis system and are suggested to aid the understanding of ligand-mediated size and phase control of CsPbI3 QDs.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
量子点
·
钙钛矿材料
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高影响因子
ACS Nano
·
2025
·
IF 16
Yu Lou,Haoran Wang,Zhicong Zhou,Miao Zeng,Zhongliang Yan,Xueying Yang,Pengfei Fu,Arui Huang,Dong Li,Tom Wu,Yang Bai,Hui-Ming Cheng
Pure-red perovskite light-emitting diodes (PeLEDs) are critical for next-generation displays, while existing systems based on mixed Br/I compositions, quasi-2D phases, or colloidal 0D quantum dots are still facing challenges in fulfilling the requirements of the Recommendation BT.2020 (Rec. 2020) red standard. CsPbI3 nanoplatelets (NPLs) whose bandgap depends on thickness-size are a promising candidate for pure-red light-emitting emitters, but their practical use as LEDs has been hampered by the metastability of the emissive CsPbI3 cubic phase. Here, we report the synthesis of stabilized γ-CsPbI3 NPLs with a tailored surface coordination by incorporating a trace amount of dimethyl sulfoxide (DMSO) and N,N’-dimethylpropyleneurea (DMPU) into the precursor. These ligands selectively coordinate with undercoordinated Pb2+ sites in [PbI6]4– octahedra through Lewis acid–base interactions, redistributing the electron density at Pb centers and inducing lattice distortion by the Pb–I–Pb bond angle torsion, thereby stabilizing the γ-phase. The complementary effect of the polarities and the coordination capacities of DMSO/DMPU guide anisotropic growth along the [100] direction, enabling atomic-precision control of the NPL thickness (4 monolayers) to tailor the quantum-confined pure-red emission. The resultant pure-red PeLEDs achieve Commission Internationale de l’Eclairage (CIE) coordinates of (0.708, 0.292), 100% compliance with the Rec. 2020 specification, as well as an external quantum efficiency (EQE) of over 12% and a superior operational lifetime with a half-lifetime (T50) of 360 min, representing the highest reported values for CsPbI3 NPL-based PeLEDs.
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