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
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 9
·2238-2248
·
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
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光伏学
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纳米材料
·
无机化学
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产品关联
DOI
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
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凝聚态物理
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半导体器件
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辐射探测
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纳米科技
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产品关联
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
Advanced Energy Materials
·
2023
·Vol. 13
·期 23
·2300451
·
IF 27.8
Jun He,Dewang Li,Hongli Liu,Junyan Xiang,Jiaxv Bai,Yuting Ren,Zhongyue Wang,Meng Xia,Xunjie Yin,Longfei Yuan,Fei Zhang,Shirong Wang
α -phase formamidine lead iodine ( α -FAPbI 3 ) as a competitive candidate to pursue high-performance perovskite solar cells (PSCs) suffers from the weakness of random nucleation and disordered growth in chasing high-grade polycrystalline films. Here, single-crystal seeds crystallization (SCSC) method is proposed to obtain high-quality α -FAPbI 3 perovskite films for the first time. Six single-crystals seeds (CsPbBr 3 , CsPbI 3 , FAPbBr 3 , FAPbI 3 , MAPbBr 3 , and MAPbI 3 ) are employed to regulate α -FAPbI 3 perovskite crystallization. These seeds act as nucleation sites and allow the perovskite to grow directly. The rapid crystallization significantly improves the crystallinity of perovskite films with uniform morphology, large grain size, and less defects. Of particular note, FAPbBr 3 seed prefers to grow α -FAPbI 3 epitaxially from FAPbBr 3 @PbI 2 heterostructure through a halogen anion exchange process. The average grain size of FAPbBr 3- perovskite film is boosted to 2.6 µm, and the trap density reduced by 11 times. The resultant FAPbBr 3 -PSCs achieve a maximum power conversion efficiency (PCE) of 23.84% with a high open-circuit voltage of 1.18 V. The unencapsulated PSC retains 91% of the initial PCE after 3000 h of storage at ≈30–50% relative humidity and preserves 98.5% of the original value after 155 h illumination with maximum power point tracking.
研究领域:
材料科学
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光伏技术
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晶体生长
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纳米技术
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半导体器件
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jiafeng Wang,Jinwei Xiu,Guanhaojie Zheng,Dong He,Han Gao,Zhenhua Chen,Zhaoning Li,Guocong Chen,Xusheng Zhang,Guoqiang Ma,Peter Raymond Slater,Zhubing He
It's still a scientific issue to synthesize exotic amines-free and pure-phase FAPbI 3 film because most FAPbI 3 films are synthesized by adding MACl-like exotic amines salts in their precursor solution to reduce the phase transition barrier. In this work, high-quality and additive-free phase-pure α-FAPbI 3 films are successfully fabricated via the sustainable Alkane/Nanocrystals method. FAPbI 3 nanocrystals (NCs) are performed as the heterogeneous nuclei to promote the nucleation and crystallization of FAPbI 3 films. Cryogenic-TEM and in situ GIWAXS evidence the seed function and interesting phase evolution of FAPbI 3 NCs. The whole phase transition course of pure FAPbI 3 film is systematically studied. IR-AFM and ToF-SIMS reveal ligands capped on NCs are extruded to the film surface. PbAc-IPA solution treating the film surface can effectively wash off the surplus ligands at the surface and modulate the surface chemistry and energy levels. As a result, an average power conversion efficiency (PCE) of 21.45% is achieved for MA-free pure α-FAPbI 3 perovskite solar cells (PSCs), as well as the best light-soaking stability record of retaining 95% of the initial PCE after 800 h. This work paves a new way to fabricate MA-free pure α-FAPbI 3 PSCs.
研究领域:
材料科学
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可再生能源
·
化学
·
物理学
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产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 46
·2204742
·
IF 15.153
Zihui Liang,Bowen Jin,Jinguo Cao,Fengxiang Chen,Jing Li,Shimin Wang,Kai Wang,Congcong Wu
Surface states are one of the crucial factors determining the phase stability of formamidinium-based perovskites. Compared with other compositions, exclusive lattice strain in FAPbI 3 perovskite generates defects at the surface more readily, making them more vulnerable at the surface and easier to trigger the phase transition from α-phase to the non-perovskite δ-phase. In order to regulate the surface quality, here, a chemi-mechanical cleavage approach is reported, i.e., tape peel-zone (PZ), implemented by attaching and peeling off the ordinary Kapton Tapes. The PZ approach can simultaneously eliminate the surface defects of perovskite and siliconize the film surface with hydrophobic silicone compounds. These two functionalities endow α-FAPbI 3 perovskite with a robust hydrophobic surface, which can sustain for 30 days under a relative humidity of 60% and withstand the high temperature up to 240 °C. The unencapsulated PZ-treated cells show 80.3% of initial performance after 90 h of continuous operation in ambient air, which is 31.4 times more stable than the pristine cell.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2024
·Vol. 14
·期 30
·2400932
·
IF 24.4
Tian Hou,Meng Zhang,Xiaoran Sun,Yihao Wang,Kaipeng Chen,Zhipeng Fu,Mingrui He,Xu Liu,Ziheng Liu,Yuelong Huang,Martin A. Green,Xiaojing Hao
Formamidinium lead triiodide (FAPbI 3 ) perovskite without methylammonium and/or Cs cations is considered the most promising candidate for perovskite photovoltaics. However, the crystallization of photoactive α-FAPbI 3 requires high-temperature annealing (≥150 °C) and a controlled humidity environment when methylammonium-containing additives are absent. A methylammonium-free ink is reported that enables low-temperature (≤80 °C) crystallization of photoactive α-FAPbI 3 films, while also demonstrating compatibility with blade-coating large-area films in ambient air. The synergistical effects of methylphenyl sulfoxide and PbCl 2 facilitate the formation of an intermediate phase of nanoscale-disordered δ-FAPbI 3 , which dramatically reduces the crystallization temperature of α-FAPbI 3 down to 80 °C and even below. The 80 °C crystalized α-FAPbI 3 exhibits reduced strain and improved uniformity compared to high-temperature annealed counterparts. The synthesized ink and the corresponding intermediate precursor film are also found remarkably stable, allowing open-air processing without the need for humidity control. Highly efficient n–i–p structured α-FAPbI 3 minimodules can be fabricated under an ambient environment RH 50% with the ink at 80 °C, achieving a power conversion efficiency of up to 22.4%. The discovery of the low-temperature FAPbI 3 ink paves a new avenue for printing perovskite solar cells and associated optoelectronic applications, accelerating the commercialization progress of perovskite materials.
研究领域:
材料科学
·
光伏技术
·
化学工程
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产品关联
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
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2026
·
IF 15.7
He Qingyun,Wang Junbo,Wu Mengyang,Zhong Chongyu,Li Lei,Zhao Xiangru,Ding Mengzhu,Yang Pinghui,Li Renzhi,Huang Wei,Qin Tianshi,Wang Fangfang
Formamidinium lead iodide (FAPbI 3 ) perovskite is a leading candidate for high-efficiency solar cells, but its application is hindered by the kinetic instability of its α-phase crystallization. Here, a highly effective strategy for directing the ordered crystallization of α-FAPbI 3 in the n-i-p architecture is developed by incorporating a self-assembled molecule (SAM) into the anti-solvent, unlike conventional phosphate-based SAMs requiring polar protic solvents, the -SCN SAM are processed from non-polar, aprotic solvents compatible with perovskite surfaces. An in-situ formed, self-assembled layer acts as a dynamic template, guiding the top-down crystallization process to yield highly ordered α-phase films. Through a series of in-situ measurements, it is rigorously demonstrated that this SAM treatment suppresses undesirable intermediate phases, accelerates the δ-to-α transition, and strategically slows crystal growth, promoting highly ordered films. This meticulously designed strategy culminates in high-quality perovskite films, enabling single-junction devices with a champion power conversion efficiency (PCE) of 26.18% (certified at 25.67%) and mini-modules with a PCE of 21.70%. These results underscore the power of directed self-assembly in fabricating highly efficient and stable n-i-p perovskite solar cells.
✓ 已验证
DOI
PubMed
高影响因子
Materials Futures
·
2025
·
IF 10.8
Jiajia Du,Yilin Chang,Le Liu,Zhibin Yu,Qinglin Du,Wenfeng Yang,Yuan Qiu,Fushen Lu,Tonggang Jiu,Huanqi Cao
The disordered crystal growth and undesired degradation of perovskite films limit the further improvement of perovskite solar cells (PSCs) performance and their commercialization. Herein, an in situ modulation strategy is proposed for preparing high-quality and stable perovskite film through adjustment of phase transformation kinetics. Benefiting from the in situ reaction between chloroformamidinium hydrochloride (ClFACl) and FA cations, the impurity intermediate phase in the perovskite film is inhibited and the α-FAPbI3 phase is induced to grow along a preferred (001) orientation. Furthermore, the introduction of ClFACl and in situ formation of guanidinium salts (FA-Gua) strengthen the intermolecular interactions in the interior of crystals, which restrains the α-phase degradation of the as-prepared perovskite films under humid and thermal treatments. With crystal orientation optimization and defects reduction, the PSCs with in situ formed FA-Gua yield a champion efficiency of 25.85% and demonstrate excellent phase stability under long-term thermal and humid ageing conditions. This in situ chemical modulation strategy expands the avenue toward optimization of crystallization orientation and α-phase stabilization, promoting the development of PSCs with enhanced performance and stability.
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 53
·期 1
·136-147
·
IF 4
Hao Gao,Minghui Zhang,Zicong Xu,Yichuan Chen,Yuehui Hu,Zhijie Yi,Jiayu Huang,Hua Zhu
Due to the hydrophilicity and black-phase instability of FA perovskites, ambient humidity is an unavoidable issue in the processing of perovskite solar cells (PSCs). MACl is among the most popular additives for improving perovskite films, but our experiments confirm that the direct addition of MACl into the precursor solution deteriorates the stability of the final α-FAPbI3 films in humid air, which is attributed to the unwanted pinholes induced by MACl volatilization. To solve this problem, a novel confined-space annealing strategy (CSA) is intentionally developed to control the amount of MACl at a low level. Through retarding the volatilization of MACl and blocking moisture ingress, dense and δ-phase-free FAPbI3 films with excellent crystallinity and stability are achieved at 100 °C under high humidity (RH: 60 ± 10%). We further compare the same amounts of MAI and FACl additives with MACl, discovering that only when MA and Cl work together can pure α-FAPbI3 films be obtained; therefore, a mechanism of MA-assisted nucleation and Cl-induced diffusion recrystallization is inferred. As a result, the PSCs employing optimal films yield a champion power conversion efficiency (PCE) of 17.27% and retain over 90% of the initial PCE after exposure to high humidity for 480 h. Our results offer deep insights into the thermodynamic and kinetic behaviors of MA and Cl in film growth and are beneficial for air-processed FA-based PSCs for commercial application.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 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）