ACS Applied Nano Materials
·
2024
·
IF 5.3
Jiakang Hu,Qiaohui Ruan,Yanyu Cui,Siyuan Ye,Zhuohan Lin,Xue Zhang,Yan Li
CsPbI3 nanoplatelets (NPLs) are considered potential candidates for orange-red light-emitting materials due to their high exciton binding energy and narrow full width at half maximum (FWHM). However, the relatively low formation energy of CsPbI3 NPLs leads to rapid growth rates, posing a challenge for the controlled synthesis of high-quality CsPbI3 NPLs. Herein, we report the synthesis of high-quality CsPbI3 NPLs emitting orange-red light using a one-pot method under mild reaction conditions. The protonation of oleylamine (OAm) by introducing HI and the strong interaction between the octadecylphosphonic acid (ODPA) ligand and Pb2+ facilitate the anisotropic growth of CsPbI3 NPLs and enable precise control over the numbers of NPL layers, achieving the desired orange-red light emission. The resulting CsPbI3 NPLs exhibited a high photoluminescence quantum yield (PLQY) of up to 90%, a narrow FWHM of only 25 nm, and excellent stability at room temperature, under ultraviolet–visible light and in aqueous environments. The comprehensive study of the formation process of CsPbI3 NPLs enriches our understanding of the growth mechanism and provides a synthetic route for producing high-quality CsPbI3 NPLs.
研究领域:
材料科学
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光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Li Yanming,Deng Ming,Zhang Xuanyu,Xu Ting,Wang Ximeng,Yao Zhiwei,Wang Qiangqiang,Qian Lei,Xiang Chaoyu
Even though lead halide perovskite has been demonstrated as a promising optoelectronic material for next-generation display applications, achieving high-efficiency and stable pure-red (620~635 nm) emission to cover the full visible wavelength is still challenging. Here, we report perovskite light-emitting diodes emitting pure-red light at 628 nm achieving high external quantum efficiencies of 26.04%. The performance is attributed to successful synthesizing strongly confined CsPbI 3 quantum dots with good stability. The strong binding 2-naphthalene sulfonic acid ligands are introduced after nucleation to suppress Ostwald ripening, meanwhile, ammonium hexafluorophosphate exchanges long chain ligands and avoids regrowth by strong binding during the purification process. Both ligands enhance the charge transport ability of CsPbI 3 quantum dots. The state-of-the-art synthesis of pure red CsPbI 3 quantum dots achieves 94% high quantum efficiency, which can maintain over 80% after 50 days, providing a method for synthesizing stable strong confined perovskite quantum dots.
研究领域:
材料科学
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光电子学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 19
·期 2
·2206205
·
IF 15.153
Hong Zou,Yuwei Duan,Shaomin Yang,Dongfang Xu,Lu Yang,Jian Cui,Hui Zhou,Meizi Wu,Jungang Wang,Xuruo Lei,Na Zhang,Zhike Liu
All-inorganic CsPbI 3 perovskite solar cells (PSCs) have been extensively studied due to their high thermal stability and unprecedented rise in power conversion efficiency (PCE). Recently, the champion PCE of CsPbI 3 PSCs has reached up to 21%; however, it is still much lower than that of organic–inorganic hybrid PSCs. Interface modification to passivate surface defects and minimize charge recombination and trapping is important to further improve the efficiency of CsPbI 3 PSCs. Herein, a new zwitterion ion is deposited at the interface between electron transporting layer (ETL) and perovskite layer to passivate the defects therein. The zwitterion ions can not only passivate oxygen vacancy (V O ) and iodine vacancy (V I ) defects, but also improve the band alignment at the ETL-perovskite interface. After the interface treatment, the PCE of CsPbI 3 device reaches up to 20.67%, which is among the highest values of CsPbI 3 PSCs so far. Due to the defect passivation and hydrophobicity improvement, the PCE of optimized device remains 94% of its original value after 800 h storing under ambient condition. These results provide an efficient way to improve the quality of ETL-perovskite interface by zwitterion ions for achieving high performance inorganic CsPbI 3 PSCs.
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 14
·2400244
·
IF 6
Mingyue Xiao,Bin Chen,Li Pan,Liya Zheng,Runze Yu,Zhu Fang,Gang Chen
Herein, a new type of CsPbI 3 -based 2D Dion–Jacobson (DJ) perovskites is reported, featuring a general formula of (PDMA)Cs n −1 PbnI 3 n +1 ( n = 1, 2, 3, 4) with 1,4-phenylenedimethanammonium (PDMA) as the organic spacer cation. The crystal structure, optical and electric properties, and surface morphology of the perovskite films are fully surveyed. The solar cell device based on the n = 4 film delivers a champion power conversion efficiency (PCE) of 11.27%, further improved to 12.61% by treating with the PDMA molecules. The PDMA passivation suppresses non-radiative recombination, extends charge-carrier lifetime, and reduces open-circuit voltage loss. A gradient energy level near the film surface facilitates electron extraction, alleviating charge accumulation. The PDMA molecules form a protective layer, inhibiting water infiltration and enhancing stability. The optimized device exhibits excellent shelf stability with no PCE decay after 110 days. In this study, a dual-functional molecule is introduced as a new DJ-type spacer and an effective passivation agent for efficient and stable CsPbI 3 -based 2D perovskite solar cells.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Rui Han,Qian Zhao,Jian Su,Xiaojun Zhou,Xiaofang Ye,Xiaojuan Liang,Juan Li,Hongkun Cai,Jian Ni,Jianjun Zhang
The best research-cell efficiency for quantum dot solar cells has boosted from 11.6 to 18.1% within 5 years due to the evolution of perovskite quantum dots (PQDs) that are being intensively developed along with the flourishing of perovskite thin-film photovoltaics. During the fabrication of PQD devices, as far as we know, methyl acetate (MeOAc) is an ineluctable solvent in ligand exchange for producing highly efficient solar cells. Nevertheless, the reproducibility for PQD solar cells using MeOAc treatment is poor since it has to make a trade-off between removing long-chain organic ligands for high charge transport and keeping them for the stabilization of the black crystal phase. Herein, we demonstrate the degree of MeOAc treatment on CsPbI3 PQD solid films in detail and clarify that MeOAc treatment is able to not only remove the oleyl ligands for promoting the charge transport but also passivate the surface defects in the CsPbI3 PQD solid films. It is noted that immoderate MeOAc treatment could induce the formation of the δ-phase, leading to the degradation of device performance. After locating the balance for MeOAc treatment, the CsPbI3 PQD solar cells are fabricated and optimized without using any additional modifications except MeOAc treatment, and these additive-free devices possess a conversion efficiency surpassing 12%.
研究领域:
材料科学
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能源技术
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纳米科技
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Junqian Zhao,Huaina Yu,Shusheng Pan,Shang Zhou,Li Zhong,Hua Wang,Yuan Yuan Luo,SiuFung Yu,Guanghai Li
CsPbI 3 sub-micrometer wires were synthesized by one-pot solution method at near room temperature . The wires are single crystalline with [100] orientation. An strong emission band centered at 470 nm was observed under ultraviolet excitation, and the emission intensity and bandwidth are dependent on the molar ratio of CsI/PbI 2 in the wires. A bright green emission with a lifetime of several tens ns was observed when excited with a soft X-ray, and the spectral response range can be modulated by the molar ratio of CsI/PbI 2 in the wires. The growth mechanism of the wires was discussed, and the influences of the cycling strain and X-ray irrigation time on the X-ray excited optical luminescence of the CsI/PbI 2 wires/PET film were analyzed and discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2304237
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IF 19
Dongfang Xu,Jungang Wang,Yuwei Duan,Shaomin Yang,Hong Zou,Lu Yang,Na Zhang,Hui Zhou,Xuruo Lei,Meizi Wu,Shengzhong Liu,Zhike Liu
The poor interface quality between cesium lead triiodide (CsPbI 3 ) perovskite and the electron transport layer limits the stability and efficiency of CsPbI 3 perovskite solar cells (PSCs). Herein, a 4-amino-2,3,5,6-tetrafluorobenzoate cesium (ATFC) is designed as a bifacial defect passivator to tailor the perovskite/TiO 2 interface. The comprehensive experiments demonstrate that ATFC can not only optimize the conductivity, electron mobility, and energy band structure of the TiO 2 layer by passivation of the undercoordinated Ti 4+ , oxygen vacancy ( V O ), and free OH defects but also promote the yield of high-quality CsPbI 3 film by synergistic passivation of undercoordinated Pb 2+ defects with the CO group and F atom, and limiting I − migration via F···I interaction. Benefiting from the above interactions, the ATFC-modified CsPbI 3 device yields a champion power conversion efficiency (PCE) of 21.11% and an excellent open-circuit voltage ( V OC ) of 1.24 V. Meanwhile, the optimized CsPbI 3 PSC maintains 92.74% of its initial efficiency after aging 800 h in air atmosphere, and has almost no efficiency attenuation after tracking at maximum power point for 350 h.
研究领域:
材料科学
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太阳能电池研究
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2021
·
IF 0
Wei Shen,Jianbin Zhang,Ruimin Dong,Yanfeng Chen,Liu Yang,Shuo Chen,Zhan Su,Yujun Dai,Kun Cao,Lihui Liu,Shufen Chen,Wei Huang
α-CsPbI3 nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca2+ (1.00 Å) as a new B-site doping ion can successfully boost CsPbI3 NC performance with both improved phase stability and optoelectronic properties. With a Ca2+/Pb2+ ratio of 0.40%, both phase and photoluminescence (PL) stability could be greatly enhanced. Facilitated by increased tolerance factor, the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120°C. The PL stability of its solution could be preserved to 83% after 147 days in ambient condition. Even using UV light to accelerate aging, the T50 of PL could boost 1.8-folds as compared to CsPbI3 NCs. Because Ca2+ doping can dramatically decrease defect densities of films and reduce hole injection barriers, the red light-emitting diodes (LEDs) exhibited about triple enhancement for maximum the external quantum efficiency (EQE) up to 7.8% and 2.2 times enhancement for half-lifetime of LED up to 85 min. We believe it is promising to further explore high-quality CsPbI3 NC LEDs via a Ca2+-doping strategy.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinyu Wang,Hongkun Li,Zhiyu Xue,Yong Xiang,Xiaoran Hu,Zhenlin Li,Haiqing Qin,Aimiao Qin,Hetong Zhang
An ideal direct X-ray detector should convert a low dose of X-ray photons into large quantity of electrical signals, coupled with sustained long-term stability. Nevertheless, a notable conflict arises between X-ray absorption efficiency and carrier transport in thick polycrystalline perovskite films. Moreover, conventional perovskite materials exhibit inherent challenges regarding the stability of their crystal phase and the consistency of the photocurrent. To circumvent these limitations, a polycrystalline perovskite thick film is proposed using orthorhombic CsPbI 3 (δ-CsPbI 3 ) as a highly stable active material. Combined with the liquid epitaxy process, δ-CsPbI 3 prefers one-dimensional growth along the carrier transportation direction, which suppresses the formation of grain boundaries, enabling high carrier mobility while maintaining X-ray absorption for a thick polycrystalline film. Consequently, the polycrystalline δ-CsPbI 3 based detector exhibits a highest sensitivity of 1768.46 μC Gy air -1 cm −2 at an electric field of 432 V mm −1 which is 88.42-fold higher than α-Se based detectors and 190-fold higher than the single crystalline δ-CsPbI 3 based detector, respectively. The sensitivity maintains 91.34 % of its initial state after 7 days exposure in the air. Combing with a thin-film transistor array, the detector achieves 8-bit imaging within a 64 × 64 matrix. This work provides a feasible method for commercialized production of high-performance direct X-ray detectors.
研究领域:
材料科学
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医学影像
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Siqi Sun,Min Lu,Jie Guo,William W. Yu,Zhifeng Shi,Guang Sun,Yu Zhang
Improved device performance of perovskite light-emitting diodes (LEDs) is demonstrated through the synergistic effect of the optimized CsPbI3 nanocrystals (NCs) as the emissive layer (EML) and ZnO/C60 bilayer as electron transport layers (ETLs). The optical characteristics of the CsPbI3 NCs were optimized by strictly controlling the feeding ratio of Cs:Pb:I to 1:1:3 in the synthesis processes of NCs, which leads to enhanced photoluminescence quantum yields (PL QY) from 65% to 92%. Additionally, the introduction of C60 not only optimized the energy level structure of the device, leading to more balanced charge injection and transport, but also smoothed the surface of the ZnO film and perovskite NCs. Consequently, a peak external quantum efficiency (EQE) of 10.7% and maximum luminance of 1377 cd m–2 were achieved.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Yu Bingcheng,Shi Jiangjian,Li Yiming,Tan Shan,Cui Yuqi,Meng Fanqi,Wu Huijue,Luo Yanhong,Li Dongmei,Meng Qingbo
Carbon-based perovskite solar cells exhibit a promising application prospect due to its cost effective and attractive hydrophobic nature and chemical inertness, but are still limited to unsatisfied device efficiency. Herein, we design a triple-layer full-carbon electrode for n-i-p typed perovskite solar cells, which is comprised of a modified macroporous carbon layer, a highly conductive graphite layer and a thin dense carbon layer, and each layer undertakes different contribution to improving the cell performance. Based on this full-carbon electrode, inorganic CsPbI 3 perovskite solar cells exhibit >19% certified efficiency which is the highest result among carbon-based CsPbI 3 devices. On one hand, carbon quantum dots decorated on the macro-porous carbon layer can realize better energy alignment of full-carbon electrode/spiro-OMeTAD/CsPbI 3 interface, on the other hand, highly conductive graphite layer is advantageous to carrier transporting. Typically, the top dense carbon layer exhibits significant thermal radiation ability, which can reduce the operational temperature of devices by about 10 °C, both from theoretical simulation and experimental testing. Thereby, packaged full-carbon electrode based CsPbI 3 cells exhibit much better photothermal stability at ~70°C accompanied by white light emitting diode illumination, which exhibit no efficiency degradation after 2000 h continuous operational tracking.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 14
·7712-7719
·
IF 6.895
Yongsheng Zhu,Jun Zhao,Gang Yang,Xiumei Xu,Gencai Pan
Lead halide perovskite nanocrystals (PNCs) have very recently emerged as promising emitters for their superior optoelectronic properties. However, the defects in perovskite itself make it susceptible to the external environment and internal ion migration, resulting in low photoluminescence quantum yield (PLQY) and poor device efficiency. Herein, we developed a method to reduce the surface defects of PNCs by introducing ammonium acetate in the synthesis of CsPbI3 PNCs. The addition of ammonium acetate can effectively eliminate undesired surface metallic lead cations and dangling bonds, resulting in an enhanced PLQY and stability. The passivated PNCs have an overall up-shift energy level, demonstrating better hole injection efficiency. As a result, the red light-emitting diodes (LEDs) fabricated with the passivated CsPbI3 PNCs achieved an optimal EQE of 10.6% and a maximum brightness of 981 cd m−2, which are 3.1 and 2.4 times that of unpassivated PNCs based devices, respectively.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）