ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 33
·2203704
·
IF 19.924
Dongfang Xu,Tong Li,Yu Han,Xuexia He,Shaomin Yang,Yuhang Che,Jie Xu,Hong Zou,Xi Guo,Jungang Wang,Xuruo Lei,Zhike Liu
CsPbI 3 inorganic perovskites have attracted significant attention due to their desirable bandgap for tandem solar cells and excellent thermal stability. However, CsPbI 3 perovskite solar cells (PSCs) still exhibit low efficiency and high energy loss due to nonradiative recombination. Herein, functionalized Ti 3 C 2 F x quantum dots (QDs) are prepared and selected as interface passivators to enhance the performance of CsPbI 3 PSCs. The systematic experimental results reveal that Ti 3 C 2 F x QDs serve as effective passivators mainly in three aspects: 1) p -type Ti 3 C 2 F x QDs can tune the energy level of perovskite films and provide an efficient pathway for hole transfer; 2) Ti 3 C 2 F x QDs can effectively passivate defects and reduce interfacial nonradiative recombination, and 3) Ti 3 C 2 F x QDs form a barrier layer to prevent water invasion and improve the stability of CsPbI 3 PSCs. Consequently, the champion CsPbI 3 PSC with Ti 3 C 2 F x QDs treatment exhibits an excellent efficiency of 20.44% with a high open-circuit voltage of 1.22 V. Meanwhile, the corresponding device without encapsulation retained 93% of its initial efficiency after 600 h of storage in ambient air.
研究领域:
材料科学
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能源技术
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jin Huang,Hao Wang,Chunyang Chen,Yizhe Tang,Husheng Yang,Shengzhong Liu,Dan Zhang
All-inorganic CsPbI 3 perovskite solar cells (PSCs) play a significant role in the new generation photovoltaic technology because of their unique optical band gap and excellent light absorption performance. However, the generation of defect states during the fabrication will cause serious non-radiative recombination and film degradation. Therefore, a new organic additive 4-Thioureidobenzoic acid (4-TBA) was introduced to decrease the defect density and optimize the device performance in this work. Thiourea group and carboxyl group in 4-TBA could not only be anchored on the film surface to passivate uncoordinated Pb 2+ defects as bilateral Lewis base, but also form the adjustable skeleton at the grain boundaries to fill Cs + vacancies, support perovskite framework, boost the charge transfer and enhance the film crystallinity. Owning to the hydrophobicity of benzene ring structure of 4-TBA, the hydrophobic protective layer could be formed on the film surface and grain boundary to isolate the damage of external moisture to the device. Furthermore, with the release of residual stress in the film, the stability of device is substantially improved. Eventually, the 0.02 mol% 4-TBA based device prepared by one-step spin-coating method possesses an ultra-high power conversion efficiency (PCE) of 20.26%, which is one of the greatest efficiencies of all-inorganic CsPbI 3 PSC at present. Surprisingly, after 1000 h of environmental stability test, the optimized device still maintains 95.6% of original efficiency without encapsulation, and the PCE attenuation is only 4.4%, showing excellent long-term stability.
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
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 22
·2400722
·
IF 8
Zhen-Yu Ma,Bai-Sheng Zhu,Xue-Chen Ru,Yi-Chen Yin,Li-Zhe Feng,Guan-Jie Ding,Mei-Yu Zhou,Yong-Hui Song,Hong-Min Zhou,Cheng-Ming Wang,Jing-Ming Hao,Hong-Bin Yao
Inorganic CsPbI 3 perovskite has great potential to fabricate deep-red light-emitting diodes (LEDs) owing to excellent color purity, thermal stability, and carrier mobility. However, fabricating high-quality CsPbI 3 thin films for high-performance LEDs remains challenging. While it is demonstrated that hydrogen bonds between organic ammonium cations and molecule additives can lead to high-quality organic–inorganic hybrid perovskite films, this method cannot be applied to CsPbI 3 thin films due to the absence of hydrogen bonds between Cs + ions and additives. In this study, an amorphous complex-seed-crystal growth process to fabricate high-quality γ -CsPbI 3 cuboid crystallite thin films, is reported. During the initial annealing, the metastable intermediates formed crystal nucleate seeds and transformed into amorphous complex intermediates, maintaining stability at an elevated temperature for perovskite crystallization. With prolonged annealing, the amorphous complex around the nucleate seeds gradually converts to γ -CsPbI 3 perovskite, enabling us to fabricate CsPbI 3 thin films with high crystallinity and orientation. The resulting deep-red LEDs exhibit a peak external quantum efficiency (EQE) of 16.5% and a high maximum luminance of 3158 cd m −2 . Moreover, the devices show significantly suppressed efficiency roll-off, maintaining an EQE of 14.8% even under a high current density of 500 mA cm −2 .
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Qian Zhang,Yong-Hui Song,Jing-Ming Hao,Yi-Feng Lan,Li-Zhe Feng,Xue-Chen Ru,Jing-Jing Wang,Kuang-Hui Song,Jun-Nan Yang,Tian Chen,Hong-Bin Yao
All-inorganic CsPbI3 perovskite is attractive for deep-red light-emitting diodes (LEDs) because of its excellent carrier mobility, high color purity, and solution processability. However, the high phase transition energy barrier of optically active CsPbI3 black phase hinders the fabrication of efficient and bright LEDs. Here, we report a novel α-BaF2 nanoparticle substrate-promoted solution-processable heteroepitaxial growth to overcome this hindrance and obtain high-quality optically active γ-CsPbI3 thin films, achieving efficient and bright deep-red LEDs. We unravel that the highly exposed planes on the α-BaF2 nanoparticle-based heteroepitaxial growth substrate have a 99.5% lattice matching degree with the (110) planes of γ-CsPbI3. This ultrahigh lattice matching degree initiates solution-processed interfacial strain-free epitaxial growth of low-defect and highly oriented γ-CsPbI3 thin films on the substrate. The obtained γ-CsPbI3 thin films are uniform, smooth, and highly luminescent, based on which we fabricate efficient and bright deep-red LEDs with a high peak external quantum efficiency of 14.1% and a record luminance of 1325 cd m–2.
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 19
·2109867
·
IF 32.086
Jing Li,Jiao Xu,Yanan Bao,Jianliang Li,Hengshan Wang,Chengyu He,Meiqi An,Huayi Tang,Zhiguang Sun,Yurui Fang,Shuang Liang,Yiming Yang
Anion-exchange in halide perovskites provides a unique pathway of bandgap engineering for fabricating heterojunctions in low-cost photovoltaics and optoelectronics. However, it remains challenging to achieve robust and sharp perovskite heterojunctions, due to the spontaneous anion interdiffusion across the heterojunction in 3D perovskites. Here, it is shown that the anionic behavior in 1D perovskites is fundamentally different, that the anion exchange can readily drive an indirect-to-direct bandgap phase transition in CsPbI 3 nanowires (NWs) and greatly lower the phase transition temperature. In addition, the heterojunction created by phase transition is epitaxial in nature, and its chemical composition can be precisely controlled upon postannealing. Further study of the phase transition dynamics reveals a threshold-dominating anion exchange mechanism in these 1D NWs rather than the gradient-dominating mechanism in 3D systems. The results provide important insights into the ionic behavior in halide perovskites, which is beneficial for applications in solar cells, light-emitting diodes (LEDs), and other semiconductor devices.
研究领域:
光伏
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光电子学
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材料科学
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半导体器件
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纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zuxiong Xu,Ning Liu,Xiaohui Liu,Wenhua Han,WenWu Xu,Jing Zhang,Like Huang,Ziyang Hu,Yuejin Zhu
Inorganic CsPbI 3 perovskite has been regarded as a kind of promising light-harvesting material due to its outstanding photoelectrical characteristics especially in perovskite solar cells (PSCs). However, there are still some problems hindering its further development, among which non-radiative recombination induced by traps and voltage loss are very pivotal. Here, the passivation of surface defects and energy level alignment of perovskite films are greatly ameliorated by facile surface modification with alkylamines. It is found that the undercoordinated Pb 2+ are effectively passivated by the terminal amino group, leading to significantly reduced surface trap density, while the charge lifetime of treated perovskite films is prolonged. Besides, the bilateral amino groups from hexanediamine (HDA) can provide additional hydrogen bond to coherently connect the PbI 6 4− octahedra. Moreover, gradient energy levels are created after surface treatment, which promote the carriers transfer and reduce the voltage deficit. Consequently, a champion power conversion efficiency (PCE) of inverted CsPbI 3 PSCs over 18 % with higher fill factor (FF) of 81.21 % and open circuit voltage ( V OC ) of 1.10 V is obtained compared to the pristine device with a lower PCE of 12.69 % (V OC of 1.01 V, and FF of 62.49 %). Besides, the unencapsulated device with HDA treatment exhibits good stability with keeping 80 % of its initial efficiency after being aged for 1000 h at 35 % relative humidity. Our work can offer a facile but effective approach for the development of highly efficient and stable inverted CsPbI 3 PSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 21
·3852-3858
·
IF 3.756
Runze Guo,Yufeng Liu,Yongzheng Fang,Zhifu Liu,Langping Dong,Lei Wang,Wenyao Li,Jingshan Hou
CsPbI3 has the least chemical stability among the CsPbX3 (X = Cl, Br, and I) perovskite nanocrystal (PNC) family due to its thermodynamically metastable characteristics, thus limiting the development of all-inorganic perovskite white-light devices. The current study presents a microfluidic-based continuous large-scale fabrication of CsPbI3-mesoporous SiO2 (CPI/m-SiO2) nanocomposites to solve the problem of large-scale continuous production of stable, repeatable, high-quality perovskite NCs. The results reveal that the chemical stability and thermal quenching behaviour of CPI PNCs were greatly improved due to the protection of mesoporous silica. Particularly, the water resistance property of CPI/m-SiO2 nanocomposites improved two-fold compared to that of noncomposite CPI PNCs, and the thermal stability of the CPI/m-SiO2 nanocomposites improved nearly three-fold at 373 K when compared with that of the noncomposite CPI NCs. Furthermore, photons were speculated to transmit along with the pores and channel structure of m-SiO2 to reduce photon absorption between NCs. Moreover, the microfluidic technology can operate continuously and is precisely controllable, enabling large-scale nanocomposite synthesis with uniform size and shape.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Hailiang Wang,Qixian Zhang,Zedong Lin,Huicong Liu,Xiaozhen Wei,Yongfa Song,Chunyu Lv,Weiping Li,Liqun Zhu,Kexiang Wang,Zhenhua Cui,Lan Wang,Changqing Lin,Penggang Yin,Tinglu Song,Yang Bai,Qi Chen,Shihe Yang,Haining Chen
Defects formed at the surface, buried interface and grain boundaries (GB) of CsPbI 3 perovskite films considerably limit photovoltaic performance. Such defects could be passivated effectively by the most prevalent post modification strategy without compromising the photoelectric properties of perovskite films, but it is still a great challenge to make this strategy comprehensive to different defects spatially distributed throughout the films. Herein, a spatially selective defect management (SSDM) strategy is developed to roundly passivate various defects at different locations within the perovskite film by a facile one-step treatment procedure using a piperazine-1,4-diium tetrafluoroborate (PZD(BF 4 ) 2 ) solution. The small-size PZD 2+ cations could penetrate into the film interior and even make it all the way to the buried interface of CsPbI 3 perovskite films, while the BF 4 − anions, with largely different properties from I − anions, mainly anchor on the film surface. Consequently, virtually all the defects at the surface, buried interface and grain boundaries of CsPbI 3 perovskite films are effectively healed, leading to significantly improved film quality, enhanced phase stability, optimized energy level alignment and promoted carrier transport. With these films, the fabricated CsPbI 3 PSCs based on carbon electrode (C-PSCs) achieve an efficiency of 18.27%, which is among the highest-reported values for inorganic C-PSCs, and stability of 500 h at 85 °C with 65% efficiency maintenance.
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
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.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Muhammad Sohail,Xiong Shen,Intikhab Alam,Zulfiqar Ali,Nimra Razzaq,Qiuyun Ouyang
The investigation of nonlinear optical (NLO) properties is crucial for the effective application of CsPbI3/TiO2 nanocomposites in NLO devices. The CsPbI3/TiO2 nanocomposites were synthesized by a hot injection method. Then, the CsPbI3/TiO2 nanocomposites were poured into methyl methacrylate via polymerization to fabricate CsPbI3/TiO2/PMMA organic glasses (OGs). The crystal structure and size morphology of the CsPbI3/TiO2 nanocomposites were examined using X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The nonlinear absorption (NLA), nonlinear refraction (NLR), and optical limiting (OL) properties of the CsPbI3/TiO2/PMMA OGs were investigated by using the Z-scan technique, employing a nanosecond pulse laser operating at a wavelength of 532 nm. The CsPbI3/PMMA and CsPbI3/TiO2/PMMA OGs can be transferred from saturable absorption (SA) to reverse saturable absorption (RSA) by varying the incident energy. In addition, the CsPbI3/TiO2/PMMA OGs exhibit superior NLA, NLR, and OL performances compared to the CsPbI3/PMMA OG and other halide-based perovskites. The enhanced nonlinear optical (NLO) properties of CsPbI3/TiO2/PMMA OGs can be ascribed to the cooperative interaction between CsPbI3 and TiO2. In summary, the results indicate that CsPbI3/TiO2 nanocomposites possess substantial potential for applications in NLO devices such as optical limiters, optical switches, and optical modulators.
研究领域:
材料科学
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光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Cong Shen,Jiaqi Zhou,Tengling Ye,Peixia Yang,Lijie Sun,Guanying Chen
All-inorganic CsPbI 3 perovskite solar cells (PSCs) have shown significant progress in power conversion efficiency (PCE). However, defects at grain boundaries and interfaces still limit their performance and stability. Traditional optimization methods, which focus on individual parameters, are time- and energy-consuming and often fail to achieve optimal multi-parameter performance. To address this challenge, we develop machine learning assisted response surface methodology (ML-assisted RSM) to optimize defect regulation parameters. The reliability and accuracy of the RSM-driven optimization can be validated by ML. Furan-2,5-dicarboxylic acid (FDCA) was found to be an effective interfacial defect regulation material on the CsPbI 3 perovskite surface. Using FDCA as the model material to regulate defect, ML-assisted RSM identified optimal conditions (14.26 mM, 103°C, 9 min), achieving a high PCE of 18.71%, which aligned closely with the predicted value of 18.68%. FDCA treatment, which contributed to the “defect healing” effect, improved perovskite quality and reduced non-radiative recombination by interacting -COOH bidentate functional groups with uncoordinated Pb 2+ defects. This study demonstrates the value of ML-assisted RSM for fast and accurate multi-parameter optimization in PSCs, accelerating the development of high-performance and stable PSCs, and providing a robust framework for optimizing other photovoltaic devices.
研究领域:
材料科学
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能源技术
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人工智能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hao Zhang,Jinju Zheng,Hui Fu,Jialiang Jiang,Deliu Ou,Jinliang Jiang,Pinjing Luo,Jialong Zhao,Roman Romashko,Aleksandr Kuchmizhak,Alexey Zhizhchenko,Sheng Cao,Weiyou Yang
Perovskite nanocrystals (NCs) are sparking intensive interest in display applications, due to their universal and unique merits such as exceptional color purity, tunable emission, and high efficiency. Unfortunately, their intrinsically unstable emission in the red part of the spectrum, mainly attributed to high formation energy barriers and undesired phase transitions significantly challenges their potential applications. Herein, we present a low-temperature (down to 50 °C) and aqueous-solvent process for the in-situ growth of γ -CsPbI 3 perovskite NCs in the polyvinyl alcohol (PVA) composite films. Introduced PVA was demonstrated to reduce the forming energy to lower the reaction temperature by forming [PbI 6 ] 4- @PVA complexes as well as to bond with CsPbI 3 preventing its transition to a non-luminous phase, thus enabling fundamentally enhanced stability. The resultant CsPbI 3 @PVA films exhibit highly efficient red photoluminescence (PL) at 686 nm, with a full width at half-maximum of 37 nm and quantum yield up to 91%, respectively. Moreover, the films demonstrate superb stability, which retains 97% initial PL intensity after 1000 hours of aging at 80 °C and blue-light exposure at 460 nm and 13 mW cm −2 . The as-assembled white light-emitting device achieves a T 95 lifetime up to 240 hours at 200000 cd/m −2 , underscoring their promise for commercial lighting and display applications.
研究领域:
材料科学
·
光学工程
✓ 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）