JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yin Xie,Zhuozheng Wang,Yan Cui,Liang Qiao,Kebin Chi,Dejun Shi,Yang Bai,Zhijie Wu,Shengbao He
2-Methoxyethanol (2-Me) is a promising solvent for large-area perovskite film preparation. Understanding the competing processes of α and δ-FAPbI 3 in 2-Me is crucial for advancing the application of 2-Me in FAPbI 3 film coating. In this study, FAPbI 3 microcrystals are fabricated by inverse temperature crystallization method at 100 °C, and are used as a platform to investigate the competing formation of α and δ-FAPbI 3 in 2-Me. Perovskite inks are analyzed using Raman, FTIR and DLS, and it is found that cluster ratio is closely related to the kinetic formation of δ-FAPbI 3 . The formation of α-FAPbI 3 can be significantly promoted when clusters are dissociated with additives (excess FAI or I 2 ). These findings provide valuable insights into the influence of precursor inks on perovskite phases.
研究领域:
材料科学
·
化学
·
光伏技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xueying Zhao,Mang Li,Xiaohui Sun,Xuyang Zhang,Zhishuai Wang,Zhaodi Lu,Xiangwei Wang,Guohua Wu
The distinctive physical and chemical characteristics of organic-inorganic lead halide perovskite make it a promising candidate for microwave absorption applications. However, the high-efficiency microwave absorption of halide perovskite-based composites is concentrated at high frequencies, while electronic equipment operates at low-frequency bands. Exploring simple and efficient methods to achieve optimal microwave absorption efficiency at low frequencies continues to pose a considerable challenge. Here, FAPbI 3 was synthesized by a simple solvent-free hand grinding method and mixed with carbon nanotubes (CNTs) to obtain a series of FAPbI 3 /CNTs (FC) composites. By modulating the mass ratio of the components, FAPbI 3 modulates the absorption bands, CNTs can effectively establish a conductive network to enhance both polarization loss and conductive loss and regulate impedance matching. The lower permittivity of FAPbI 3 gives FC an advantage in terms of low-frequency microwave absorption. The FC-4 composite exhibits a minimum reflection loss (RL min ) of −55.67 dB at a low frequency of 6.88 GHz with a thickness of 3.5 mm. Meanwhile, microwave absorption performance can reach 99 % covering almost the entire C band when utilizing a thickness ranging from 3 to 5 mm. Additionally, according to adjusting the load of FAPbI 3 in the mixture, the FC-3 composite displays the highest microwave absorption value among the composites based on halide perovskites. With a thickness of 1.4 mm, the reflection loss at 17.4 GHz reaches an impressive minimum value of −71.89 dB. This study represents the first research specifically focused on FAPbI 3 perovskite in the domain of microwave absorption. FC composites display remarkable capabilities in absorbing microwaves, indicating their promising prospects for advancement within the realm of microwave absorption. This research may provide valuable insights for the design of low-frequency and high-efficiency microwave absorbers.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 157
·期 19
·
IF 4.304
Xu Tie,Cai Hongkun,Ye Xiaofang,Zhu Yinbin,Ni Jian,Li Juan,Zhang Jianjun
Black-phase formamidinium lead iodide (FAPbI 3 ), with a narrow bandgap and high thermal stability, has emerged as an in-demand material for highly efficient perovskite solar cells (PSCs). In a two-step sequential deposition, the PbI 2 film plays an important role in the formation of a perovskite film with desirable qualities. This paper explores using N-methyl-2-pyrrolidone (NMP), a strong Lewis base, and N,N-dimethylformamide (DMF) as a mixed precursor solvent (DMF/NMP) of PbI 2 and reports on preparing PbI 2 films with a porous morphology by thermal treatment. Porous PbI 2 films ensure the diffusion and sufficient reaction of the formamidinium iodide solution to form a smooth perovskite film. In addition, a dynamic spin coating method is also introduced to improve the uniformity of the perovskite film. Both methods yield a pure α-phase FAPbI 3 film immediately in the unannealed state, which is necessary for the perovskite film to maintain phase stability. Finally, PSCs with a power conversion efficiency of 21.20% (0.13 cm 2 ) are fabricated and optimized. The unencapsulated PSCs retain 90% of the initial efficiency for 1000 hours in dry air and exhibit a good thermal stability when heated to 85 °C.
研究领域:
材料科学
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能源技术
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光伏器件
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产品关联
DOI
PubMed
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Minna Hou,Ya Wang,Meidouxue Han,Huizhi Ren,Rongbo Wang,Juntao Zhao,Qian Huang,Yi Ding,Xiaodan Zhang,Guofu Hou,Ying Zhao
For planar n-i-p device, SnO 2 /perovskite interface, which not only governs the electron extraction and transport, but affects perovskite formation, takes fundamental role to achieve perovskite solar cells (PCSs) with high performance in the context of commercializing courses. KCl treatment is one of the most effective and widely accepted strategy to optimize SnO 2 /perovskite interface. Whereas the role of KCl draws tremendous controversy, and needs further investigation. Thereby, we systematically investigated the influence of KCl treatment on optoelectronic properties of SnO 2 and perovskite film, and the photovoltaic performance of PSCs. It is demonstrated that KCl treatment can suppress hydroxyl on SnO 2 surface and improve charge extraction. In addition, KCl treatment can promote perovskite crystallization. Due to the well matched lattice constants of KCl and α-FAPbI 3 , we proposed that KCl may serve as seed crystal to guide FAPbI 3 formation, while Cl further promotes perovskite crystal growth. Consequently, the solar cell based on SnO 2 /KCl exhibited promoted photovoltaic performance with efficiency increased from 19.51% to 20.65%, and improved thermal stability in ambient condition. Meanwhile, benefiting from the capability of promoting α-FAPbI 3 crystallization of KCl treatment, MA-free device based on SnO 2 /KCl achieved increased efficiency from 19.03% to 20.42%.
研究领域:
材料科学
·
太阳能电池技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Li Cao,Yu Tong,Yewen Ke,Yali Chen,Yufeng Li,Hongqiang Wang,Kun Wang
Fabricating perovskite solar cells (PSCs) in an ambient environment provides low-cost preparation routes for solar cells that are suitable for large-scale production. Compared with methylammonium (MA)- based perovskite materials, formamidinium lead iodide (FAPbI3) possesses a more favorable bandgap for light harvesting and better thermostability. However, the phase transition from the α-phase to the δ-phase easily occurs, making it challenging for ambient-air processing. Herein, we develop a buried interface engineering strategy via two molecules including 1,4-bis(diphenylphosphino)butane (DPPB) as well as [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl] phosphonic acid (Me-4PACz) to optimize air-processed inverted FAPbI3 PSCs. This strategy regulates the crystallization process of the air-fabricated FAPbI3 perovskite film, leading to a purer α-phase with significantly enhanced crystallinity and enlarged grain sizes. Apart from improving the bulk perovskite film, the defects at the NiOx/perovskite interface are passivated, and the energy levels are better matched in the modified device, which facilitates efficient carrier extraction. Resultantly, the target device processed in the open air achieves a dramatically improved power conversion efficiency from 11.37% to 18.45%, in association with an enhanced device stability.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 10
·3410-3417
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IF 5.7
Fanxiu Feng,Yan Guan,Fangzhou Liu,Cuncun Wu,Huhu Su,Biao Wang,Xian Zhang,Yuchao Liang,Shaogeng Cai,Yangyang Zhang,Lixin Xiao,Shijian Zheng
Formamidinium lead iodide (FAPbI3) has received substantial research interest for photovoltaic applications due to its excellent thermal stability and narrow bandgap close to the Shockley–Queisser limit. Unfortunately, the compositionally pure FAPbI3-based perovskite solar cells (PSCs) have unsatisfactory efficiency and the common approach of incorporating additives into FAPbI3 has been used to improve their properties. However, commonly used additives generally contribute to the complexity of the FAPbI3 composition, which could pose potential risks to the long-term operational stability of PSCs. Here, we report a strategy for the fabrication of additive-free FAPbI3 films using a low pressure assisted (LPA) method. By adjusting the pressure reduction rate, we achieved compositionally pure FAPbI3-based PSCs with power conversion efficiency (PCE) exceeding 20%, along with enhanced thermal stability and long-term stability under working conditions. The improved optoelectronic properties can be attributed to the excellent homogeneity of the FAPbI3 film with low defect density and better carrier extraction at the interface between the FAPbI3 film and carrier-transport layers. This further leads to better thermal and long-term operational stability of the FAPbI3 PSCs.
研究领域:
材料科学
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光伏技术
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可再生能源
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产品关联
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 35
·
IF 13.6
Depeng Chu,Binxia Jia,Naiming Liu,Yunxia Zhang,Xiaotong Li,Jiangshan Feng,Jiacheng Pi,Zhou Yang,Guangtao Zhao,Yucheng Liu,Shengzhong (Frank) Liu,Nam-Gyu Park
Preliminary theoretical analyses indicate that lattice relaxation may be used to release lattice strain in the FAPbI3 perovskite to warrant both high x-ray detection performance and improved stability. Herein, we demonstrate stable black α-phase FAPbI3 single crystals (SCs) realized by lattice engineering via annealing in the ambient atmosphere. The engineered α-FAPbI3 SC detector shows almost all the best figures of merit including a high sensitivity of 4.15 × 105 μC Gyair−1 cm−2, a low detection limit of 1.1 nGyair s−1, a high resolution of 15.9 lp mm−1, and a short response time of 214 μs. We further demonstrate high-definition x-ray imaging at a dose rate below 10 nGyair s−1 on the FAPbI3 SC, indicating a minimal dose-area product of 0.048 mGyair cm2 to the patient for one-time posteroanterior chest diagnosis, which is more than 3000 times lower than the international reference level of 150 mGyair cm2. In addition, the robust long-term stability enables the FAPbI3 SC x-ray detector to work steadily for more than 40 years.
研究领域:
材料科学
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医学影像
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辐射探测
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 9
·2238-2248
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IF 7.2
Pan Yining,Zeng Qiang,Li Linhong,Deng Mingxin,Yang Xiaoyu,Zheng Rongze,Liao Xiang,Zhang Mingjun,Liu Fangyang
Perovskite solar cells (PSCs) based on α-phase FAPbI 3 (α-FAPbI 3 ) microcrystals precursor outperform those with δ-phase microcrystals due to their superior crystallinity and fewer defects, making α-phase microcrystals precursor more advantageous for high-performance PSCs. However, most reported synthesis methods of perovskite microcrystals, especially for aqueous synthesis, fail to reach the energy threshold required for α-phase transformation and therefore exhibit the δ phase. In this study, we introduce a novel aqueous synthesis method to fabricate α-FAPbI 3 microcrystals. Our approach overcomes the energy barrier by properly heating the reaction system, enabling the direct formation of α-FAPbI 3 in water. This direct one-step aqueous synthesis route yields α-FAPbI 3 microcrystals with superior phase purity, crystallinity, and minimal defect density. Combined with green anti-solvent, the high-quality α-FAPbI 3 microcrystals serving as exceptional precursors endow perovskite films with reduced nonradiative recombination. The PSC achieves a remarkable power conversion efficiency (PCE) of 24.43%, which is one of the highest PCE reports for using the green anti-solvent in ambient air condition. This aqueous synthesis approach shows a significant potential for scalable production of high-performance PSCs.
研究领域:
材料科学
·
光伏学
·
纳米材料
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yumeng Zhang,Kexin Zhang,Ruikai Zhang,Xinbo Shi,Guofu Zhou,Jun-Ming Liu,Yue Jiang,Zhen Wang,Jinwei Gao
Formamidinium lead iodide (FAPbI3)-based perovskites are promising photoabsorber materials owing to their optimal bandgap and excellent photothermal stability. However, their complex crystallization behavior during blade-coating presents challenges for scalable fabrication, leading to poor perovskite film morphology and uniformity, which adversely affect the performance and stability of perovskite solar cells (PSCs). Herein, a two-dimensional (2D) perovskite seed layer was introduced onto the SnO2 electron transport layer within a conventional n-i-p device architecture. This seed layer was employed to provide heterogeneous nucleation sites for and to induce the bottom-up-oriented growth of [PbI6]4– octahedra, thereby facilitating the formation of the photoactive α-FAPbI3 phase with enhanced crystallinity and film uniformity. As a result, PSCs with an active area of 2.5 × 2.5 cm2 were fabricated, achieving a power conversion efficiency (PCE) of 22.03% and an open-circuit voltage (VOC) of 1.10 V. Furthermore, over 80% of the initial efficiency was retained after 2000 h of ambient storage (relative humidity ≈ 5%, temperature ≈ 25 °C) without encapsulation, indicating excellent long-term stability. Through this approach, a viable and scalable pathway has been established for the fabrication of high-quality α-FAPbI3 films, offering significant potential for the advancement of efficient and stable PSCs.
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Fangwen Cheng,Shaoqi Zhan,Xinfeng Dai,Xiaofeng Huang,Binghui Wu,Nanfeng Zheng
α-FAPbI3-based perovskite solar cells have recently attracted increasing attention as a result of an ideal bandgap and longer exciton lifetime of FAPbI3 compared to perovskites with other compositions. However, in a traditional fabrication method, the α-FAPbI3 films were usually obtained by a direct phase transition from δ to α phase at a high annealing temperature, leading to low quality with poor crystallinity and numerous defects. The formation and stabilization of phase-pure, material-pure, high-quality α-FAPbI3 films remain challenging. In this work, a FA vapor-assisted cation-exchange pathway from low-dimensional perovskites to three-dimensional α-FAPbI3 was built, through which phase-pure and material-pure α-FAPbI3 films were achieved at 100 °C below the temperature of thermodynamic δ-to-α phase transition (∼150 °C). Through an in-depth study, the cation-exchange pathway was found to have a low reaction barrier directly toward α-FAPbI3 and suppress the formation of δ-FAPbI3, leading to high-quality α-FAPbI3 with high orientation and few trap states at a low annealing temperature. Consequently, small-area devices and large-area modules with as-prepared α-FAPbI3 films were achieved with improved performance, showing great potential for further study and application.
研究领域:
材料科学
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能源技术
·
物理化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·226
·
IF 5.3
Shuo Wang,Simiao Li,Qian Zhao
Perovskite quantum dots (PQDs) have shown great promise in optoelectronic device applications. Typically, a traditional hot-injection method with heating and high vacuum pressure is used to synthesize these colloidal nanoparticles. In this article, we report a low-cost synthetic method for FAPbI3PQDs in air at atmospheric pressure with the assistance of ZnI2. Compared with the FAPbI3PQDs synthesized under vacuum/N2condition, the air-synthesized Zn:FAPbI3PQDs exhibit the same crystalline structure with a similar preferential crystallographic orientation but demonstrate higher colloidal stability and higher production yield. Furthermore, we examine the influence of ZnI2during the synthesis process on morphologies and optoelectronic properties. The results show that the mean size of the obtained FAPbI3PQDs is decreased by increasing the amount of added ZnI2. More importantly, introducing an optimal amount of ZnI2into the Pb source precursor enables increasing the carrier lifetime of FAPbI3PQDs, showing the potential beneficial effect on device performance.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2025
·Vol. 18
·期 1
·14
·
IF 36.3
Huang Yu-Hua,Zou Su-Yan,Sheng Cong-Yi,Fang Yu-Chuang,Wang Xu-Dong,Wei Wei,Li Wen-Guang,Kuang Dai-Bin
A lattice-anchoring strategy using low-dimensional perovskite addresses structural instability in α-formamidinium lead iodide (FAPbI 3 ) by matching crystal lattice, mitigating residual stress and tensile strain.
Enhanced Pb-I bonding strength and reduced lattice strain improve structural stability and carrier mobility-lifetime product, enabling efficient charge transport.
Optimized X-ray detectors achieve high sensitivity (1.83 × 10 5 μC Gy air –1 cm –2 ), low detection limit (27.6 nGy air s –1 ), and stable performance under prolonged irradiation.
研究领域:
材料科学
·
凝聚态物理
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半导体器件
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辐射探测
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）