JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 3.9
Feng Mingyue,Li Chixuan,Li Furu,Zhang Chengqian,Ren Yan
Although perovskite crystals exhibit defect tolerance, the presence of crystal defects may still compromise their photodetection performance. In this paper, we study the solution growth of high-quality δ-CsPbI 3 single-crystalline fibers (SCFs), and highlight the impact of crystal quality on the enhancement of the photodetector performances. To achieve high-quality δ-CsPbI 3 SCFs, a seeded growth of δ-CsPbI 3 SCFs is carried out using an optimized HI-DMF growth protocol. In this protocol, fiber seeds picked in HI aqueous solution are seeded to grow in DMF solution. As a result, high-quality flexible δ-CsPbI 3 SCFs with a large length-to-width ratio are obtained. The photodetector fabricated with the high-quality SCF in an Ag/CsPbI 3 /Ag architecture exhibits a low dark current, excellent device stability, a higher signal-to-noise ratio and a ninefold enhancement in photo-responsivity compared with the detector made using defective crystal. These findings establish a critical link between crystal perfection and advanced photodetector functionality, offering new avenues for high-performance X-ray detection technologies. Graphical abstract
CsPbI 3 single-crystalline fibers prepared by seeded growth exhibit high crystal quality, excellent flexibility and enhanced photodetection performance.
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高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 16
·2000498
·
IF 8.286
Bing Tang,Lin Ji Ruan,Changyun Qin,Ang Shu,Huimei He,Ying Ma
High thermal stability of all-inorganic perovskite nanocrystals (NCs) offers their potential application in various fields such as solar cells and light-emitting diodes. However, the cubic cesium lead iodide (α-CsPbI 3 ) with the most appropriate bandgap for light harvesting is thermodynamically unstable at room temperature and spontaneously transforms into the undesired orthorhombic δ-CsPbI 3 . Here, a simple method is demonstrated to synthesize orthorhombic γ-CsPbI 3 NCs using 3-aminopropyl triethoxysilane molecules as capping ligands. The crystalline structure and morphology of these γ-CsPbI 3 NCs hardly change after exposure to ethanol even though they are capped with fewer ligands. Their high stability is also demonstrated by retaining their photoluminescence (PL) intensity after heating/cooling cycles in the range of 295–375 K, in contrast to a quick destruction of α-CsPbI 3 NCs under the same condition. More importantly, temperature-dependent PL spectra reveal that the exciton/electron–phonon coupling and exciton recombination process of these γ-CsPbI 3 NCs strongly depend on their particle sizes. This finding may enable versatile design of stable γ-CsPbI 3 NCs with different sizes meeting diverse demands for various applications.
研究领域:
材料科学
·
光学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chunyan Lu,Xiaodong Li,Haobo Yuan,Wenxiao Zhang,Xuemin Guo,Acan Liu,Hui Yang,Wen Li,Zhengbo Cui,YuYang Hu,Junfeng Fang
Energy loss at perovskite/electron transporting layer (ETL) interface is one key reason limiting the efficiency of inverted CsPbI 3 perovskite solar cells (PSCs). Here we introduce a back-surface field in inverted PSCs through 4-Imidazoleethylamine (4-IEA) treatment to mitigate such interfacial energy loss. 4-IEA treatment will upshift the Fermi level of CsPbI 3 surface and thus induce an extra back-surface field aligning with the built-in potential of inverted PSCs, thus reducing energy loss and facilitating electrons extraction at the CsPbI 3 /ETL interface. In addition, 4-IEA can passivate interfacial defects owing to its Lewis base-acid interaction with CsPbI 3 . As a result, power conversion efficiency (PCE) of 20.22% is achieved in inverted CsPbI 3 PSCs. Furthermore, PSCs with 4-IEA also exhibit good operational stability, retaining over 70% of initial efficiency after maximum power point (MPP) tracking at high temperature of 65 ℃ for 200 h.
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高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Yiyuan Tang,Zhen Wu,Xin Zhang,Kaifeng Liao,Guojie Wang
Cesium lead halide perovskite nanocrystals (PNCs) are promising candidates for photoelectric applications due to their remarkable optoelectronic properties. However, the poor stability of PNCs, especially oleic acid (OA)/oleylamine (OAm)-capped CsPbI 3 , is the main obstacle to their commercialization. In this study, CsPbI 3 PNCs with long-term stability are prepared through synergistic passivation of n -octylphosphonic acid (OPA) and (3-aminopropyl) triethoxysilane (APS). OPA provides a stronger binding affinity to passivate surface defects, while the SiO 2 layer formed by APS can further reduce ligand detachment and block the access of external factors to the PNCs. The stability of OPA/APS-capped CsPbI 3 PNCs can be synergistically enhanced in comparison with that of OA/OAm-capped PNCs, the fluorescence of which can be also increased significantly. Employing the high-performance OPA/APS-capped CsPbI 3 PNCs as color-converting materials, a white light-emitting diode with a color coordinate of (0.33 and 0.32) and a wide color gamut of 126% National Television Standard Committee color space is fabricated.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Luhang Xu,Yuang Fu,Yuhao Li,Guodong Zhou,Xinhui Lu
The migration of mobile ionic halide vacancies is usually considered detrimental to the performance and stability of perovskite optoelectronic devices. Taking advantage of this intrinsic feature, we fabricated a CsPbI3 perovskite quantum dot (PQD)-based write-once-read-many-times (WORM) memory device with a simple sandwich structure that demonstrates intrinsic ternary states with a high ON/OFF ratio of 103:102:1 and a long retention time of 104 s. Through electrochemical impedance spectroscopy, we proved that the resistive switching is achieved by the migration of mobile iodine vacancies (VIs) under an electric field to form conductive filaments (CFs). Using in situ conductive atomic force microscopy, we further revealed that the multilevel property arises from the different activation energies for VIs to migrate at grain boundaries and grain interiors, resulting in two distinct pathways for CFs to grow. Our work highlights the potential of CsPbI3 PQD-based WORM devices, showcasing intrinsic multilevel properties achieved in a simple device structure by rationally controlling the drift of ionic defects.
研究领域:
材料科学
·
电子工程
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PubMed
高影响因子
Small
·
2024
·
IF 13
Man Yang,Kangwei Mo,Xueliang Zhu,Yong Liu,Ning Yan,Zhiping Wang
The unfavorable morphology and high crystallization temperature ( T c ) of inorganic perovskites pose a significant challenge to their widespread application in photovoltaics. In this study, an effective approach is proposed to enhance the morphology of cesium lead triiodide (CsPbI 3 ) while lowering its T c . By introducing dimethylammonium acetate into the perovskite precursor solution, a rapid nucleation stage is facilitated, and significantly enhances the crystal growth of the intermediate phase at low annealing temperatures, followed by a slow crystal growth stage at higher annealing temperatures. This results in a uniform and dense morphology in CsPbI 3 perovskite films with enhanced crystallinity, simultaneously reducing the T c from 200 to 150 °C. Applying this approach in positive-intrinsic-negative (p-i-n) inverted cells yields a high power conversion efficiency of 19.23%. Importantly, these cells exhibit significantly enhanced stability, even under stress at 85 °C.
研究领域:
材料科学
·
光伏技术
·
能源工程
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chun Sun,Zhengtong Wang,Fuhao Zhang,Anni Chen,Zhihui Deng,Kai Lian,Yiwei Zhao,Jiachen Han,Yelin Ding,Mingming Luo
The development of pure red-emitting CsPbI 3 quantum dots (QDs) has been hindered by challenges including long-term instability, low yield and photoluminescence quantum yields (PLQYs), and self-absorption issues in solid-state applications. Herein, sodium citrate (SC) passivated CsPbI 3 QDs are prepared by using a simple post-treatment method, which is also applicable to other CsPbX 3 QDs. Due to the chelating coordination role of citrate, the PLQY of red SC-CsPbI 3 can reach 96 %. In addition to its passivating role, SC also acts as a matrix to increase inter-particle distances, reducing self-absorption and acquiring high PL intensity. Furthermore, SC treatment can also increase the yield of smaller QDs, which are typically challenging to isolate using conventional centrifugation methods. The passivation afforded by SC results in enhanced thermal and air stability in the samples. We utilized this narrow-band red phosphor to fabricate white light-emitting diodes (WLEDs) for lighting and display applications. Upon incorporating the red phosphor into the commercial WLED, there is a notable enhancement in the color rendering index (CRI), signifying its substantial impact on lighting WLED. For display application, the perovskite-based WLED achieves a color gamut coverage reaching up to 120 % of the National Television System Committee (NTSC) standard. This remarkable performance also underscores its significant potential for applications in display area.
研究领域:
材料科学
·
光学工程
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高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Song Wang,Hongyan Li,Xiaohu Zhao,Jiaxin Rui,Zhaogang Teng,Lihong Qi,Kai Pan
One-dimensional (1D) CsPbI3 nanowires (NWs) are promising for nanoscale optoelectronic applications due to their strong quantum confinement and anisotropic charge-transport characteristics, yet their practical use is severely limited by high defect density and poor structural stability. Here, we report an intrinsic stabilization strategy for CsPbI3 NWs via controlled Y3+ doping. CsPbI3 nanocrystals with different Y3+ contents were synthesized by a hot-injection method and subsequently transformed into 1D NWs through a solvent-induced phase conversion process. Structural characterizations demonstrate that Y3+ ions substitutionally occupy Pb2+ sites, inducing slight lattice contraction without generating secondary phases. Importantly, Y3+ incorporation markedly suppresses nonradiative defect states and enhances optical performance. The CsPbI3 NWs with an optimal Y3+ doping level of 20% exhibit the highest photoluminescence (PL) intensity and a 3-fold increase in average exciton lifetime, from ∼35 ns for pristine NWs to ∼110 ns after doping. Temperature-dependent PL analysis reveals an increased exciton binding energy from 413.6 to 491.2 meV and an enhanced longitudinal optical phonon energy from 465.2 to 614.6 meV, indicating strengthened exciton confinement and improved thermal stability. Moreover, the 20% Y3+-doped CsPbI3 NWs retain approximately 90% of their initial PL intensity after 28 days of ambient exposure, whereas pristine NWs undergo rapid degradation. These results demonstrate that Y3+ doping enables effective lattice-level defect regulation and intrinsic stabilization of CsPbI3 NWs, providing a robust and quantitative design strategy for high-performance and long-lifetime perovskite optoelectronic devices.
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高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Min Lu,Jie Guo,Po Lu,Liu Zhang,Ying Zhang,Qilin Dai,Yue Hu,Vicki L. Colvin,William W. Yu
Lead halide perovskite nanocrystals (NCs) as a promising material have been widely applied in optoelectronic devices, but the massive defects reduce their optical properties and consequently limit the device performance. In this work, we developed a method to reduce the surface defects caused by unbonded lead on the surface of NCs by introducing ammonium thiocyanate in the synthesis of CsPbI3 NCs. Thiocyanate ions can link to the unbonded lead on the surface of perovskite NCs, resulting in a prolonged lifetime and enhanced photoluminescence quantum yield. At the same time, the whole energy level of passivated CsPbI3 NC films goes down compared to the pristine CsPbI3 NC films, which contributes to better electron injection. As a result, the passivated NCs based light-emitting diodes (LEDs) realized 10.3% external quantum efficiency and 823 cd m–2 luminance, higher than the LEDs made from the non-passivated NCs.
研究领域:
材料科学
·
光学工程
·
电子工程
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高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2100243
·
IF 1.599
Chunyu Sun,Xinzhan Wang,Pengfei Qiu,Xuejiao Mou,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
Temperature-dependent photoluminescence (PL) properties of high quality cubic phase α-CsPbI 3 nanocrystals are investigated, and thermal transfer from free excitons to trapped excitons is observed. Free exciton recombination is the main origin of the high PL quantum yield (97%) at room temperature. Little change of PL peak energy is observed with decreasing temperature from 280 to 200 K, and it shifts from 1.84 to 1.81 eV in the region of 200 and 80 K. The PL peak intensity decreases with decreasing temperature first and then increases, and the minimum value is observed at 180 K. Two PL bands are obtained by Gaussian fittings in the PL spectra detected at different temperatures, and the high energy band is attributed to the emission of free excitons, while that for the low energy band is related to the transition of trapped excitons. The PL integrated intensity ratio of trapped exciton and free exciton transition increases from 0.18 to 2.10 with decreasing the temperature, which suggests that thermal transfer from free exciton to trapped exciton states leads to the dominant optical emission of trapped exciton recombination in the low temperature region.
研究领域:
材料科学
·
光学
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 36
·13117-13123
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IF 8.067
Wenbin Shi,Xiao Zhang,Hsueh Shih Chen,Katarzyna Matras-Postolek,Ping Yang
Lead-halide perovskite nanocrystals (NCs), such as red-emitting CsPbI3, have gained significant attention due to their promising applications such as display backlights, light-emitting devices, and lasers. However, it is still a great challenge to stabilize CsPbI3 NCs and further tune and optimize their luminescence properties. In this study, effective Zn-derived ligand engineering was successfully conducted to create highly stable and bright CsPbI3 NCs for LEDs. The phase stability of CsPbI3 NCs at room temperature was improved by Zn ion-derived 1-dodecanethiol (DDT) ligand engineering, in which the ratios of Zn/DDT play an important role. Under optimized conditions, the as-treated CsPbI3 NCs were well dispersed and revealed uniform size distribution and a high photoluminescence (PL) quantum yield of 95.4%. In addition, the treated CsPbI3 NCs retained the initial PL efficiency after being stored at room temperature for more than 100 days. No phase change occurred for the NCs under UV light irradiation and thermal cycling conditions. Finally, these CsPbI3 NCs were used for white light-emitting diodes, which had advantages in a wide color gamut and good stability.
研究领域:
材料科学
·
光学工程
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高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Zhixing Wang,Jinqing Lv,Weifeng Liu,Weiwei Sun,Zhiwen Dong,Kexiang Wang,Tingting You,Penggang Yin
Carbon-based inorganic perovskite solar cells (C-IPSCs) with promising efficiency, good thermal stability, and low cost have emerged as important candidates for photovoltaic device commercialization. However, the relatively poor phase stability of CsPbI3 perovskite in humid conditions and the mismatched energy level at the perovskite/carbon interface hinder the efficiency and stability of CsPbI3 C-IPSCs. Herein, a facile molecular modification strategy is employed to solve the current issues using a multifunctional molecule, ethyl thioacetate (ES). Post-treatment enhances the hydrophobicity of CsPbI3 films due to the relatively small polarity of ES molecules. The C═O and C–S groups in ES form Lewis acid–base coordination interactions with uncoordinated Pb2+ in perovskite, effectively passivating surface defects in perovskite films. In addition, ES treatment optimizes the energy level arrangement, facilitating hole extraction at the perovskite/carbon interface. Thus, ES post-treatment yields a champion PCE of 17.07% for carbon-based CsPbI3 solar cells. The ES-treated C-IPSCs also show enhanced stability, which retains 80% of the initial PCE after 1360 h at 20% RH, surpassing the untreated counterparts by 19%.
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高影响因子
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