CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shanshan Yu,Hongli Liu,Shirong Wang,Hongwei Zhu,Xiaofei Dong,Xianggao Li
FAPbI 3 has been greatly developed in Perovskite solar cells (PSCs) profiting from their narrow bandgap, high panchromatic absorption and long carrier diffusion length. Unfortunately, the phase instability of FAPbI 3 -based perovskite restricts its further development in PSCs. Here, hydrazinium cation (HA + : NH 2 NH 3 + ) is incorporated into FAPbI 3 -based perovskite to obtain novel 1D/3D hybrid dimension structure with stable α -FAPbI 3 for the first time. The strong hydrogen bonding of HA + increases the crystallinity and grain size of perovskite. Furthermore, SEM and TEM reveal that the new HA based 1D-phase (1D-HA-phase) exists like “rivet” passivating among the grain boundary of 3D perovskite, forming 1D/3D hybrid dimension structure contributing to the stability of FAPbI 3 -based perovskite. Confocal fluorescence microscopy, time-resolved photoluminescence spectroscopy and Kelvin probe force microscope measurements reveal that the trap state can be effectively restrained and the non-radiative recombination is largely suppressed in HA + mixed FAPbI 3 -based perovskite film with 1D-HA-phase. Finally, stable α -FAPbI 3 -based perovskite and its film with high crystallinity, smooth surface morphology, excellent photovoltaic performance and few defects are obtained. PSC using (FAMACs) 0.85 HA 0.15 perovskite achieves a power conversion efficiency of 21.20% which can retain 90% at room temperature in ambient environment for 2520 h.
研究领域:
材料科学
·
能源科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 45
·18391-18400
·
IF 5.7
Meidan Que,Shenghui He,Lili Gao,Boyue Zhang,Yabo Wang,Jin Chen,Bo Li,Wei Huang,Peng Zhong
The dynamic nature of formamidine lead iodide quantum dots (FAPbI3 QDs) limits their practical application by causing the appearance of ionic vacancy defects on the surface of QDs, which would then allow for significant trap-assisted non-radiative recombination of charge carriers. Herein, we explore a feasible surface modification strategy for passivating vacancy defects. Different lead salts are employed in the post-treatment procedure of quantum dot films. Based on both experimental and theoretical findings, Pb(NO3)2 passivation comprises Pb2+ and FA+. On the quantum dot surface, the O atoms from NO−3 form strong chemical bonds with FA+, and the O–C⋯O–N structure, defined by a dual-anchored configuration, contributes to the establishment of a stable crystal structure by exhibiting optimal bond lengths (3.486 Å and 3.775 Å, respectively) and a higher binding energy (10.51 eV). Finally, FAPbI3 quantum dot solar cells simultaneously achieve both exceptional environmental stability and a champion photoelectric conversion efficiency of 12.11%. This work provides valuable insights into surface chemical engineering of quantum dots, paving the way for high-performing photovoltaic devices.
研究领域:
材料科学
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光伏技术
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化学工程
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表面化学
✓ 已验证
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
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 20
·1900774
·
IF 7.125
Xin Zhang,Dengbao Han,Chenhui Wang,Imran Muhammad,Feng Zhang,Ali Shmshad,Xulan Xue,Wenyu Ji,Shuai Chang,Haizheng Zhong
The in situ fabricated perovskite nanocrystals (PNCs) obtained through spin-coating a precursor solution are suitable candidates to achieve efficient perovskite light emitting diodes (PeLEDs). In this work, the solvent effects of on-chip crystallization are investigated by correlating the nucleation and growth process of in situ fabricated formamidinium lead iodide (FAPbI 3 ) nanocrystals with their optical and electronic properties. The FAPbI 3 nanocrystals obtained from a precursor solution in γ-butyrolactone (GBL) are smaller than those obtained from N , N -dimethylformamide and dimethyl sulfoxide, and the relatively weak coordination between GBL and the precursor molecules enables reduced defect states in the resulted PNCs with enhanced photoluminescence properties. A modified LaMer model is proposed to describe the solvent effects in the on-chip crystallization process. Based on these understandings, red emissive FA 0.87 Cs 0.13 PbI 3 nanocrystal films with absolute photoluminescence quantum yields up to 70% are realized. Finally, an efficient PeLED with maximum luminance of 218 cd m −2 and peak external quantum efficiency of 15.8% is achieved with good reproducibility.
研究领域:
材料科学
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纳米科技
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光电子学
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半导体器件
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凝聚态物理
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Jingcheng Xu,Shuo Ding,Fangzheng Ning,Xinjian Li,Zhuoyuan Kong,Linsong Cui,Kai Kang,Kaifu Qiu,Ting Zhang,Chaoyu Xiang
The two-step blade-coating method exhibits several advantages such as simple operation and high reproducibility, making it a promising scalable deposition process for high-efficiency perovskite solar cells. However, a large number of defects exist at the interface, leading to nonradiative carrier recombination losses, which negatively impact device performance and stability. Introducing pyridine derivatives at the interface to passivate defects is an effective strategy. However, most pyridine-derived molecules are used in large quantities and high concentrations, which compromises process reproducibility, reduces manufacturing reliability, and increases production costs. This study demonstrates the introduction of 3,5-Difluorpyridin-2,6-Diamin (2NF-Py) molecules at the perovskite/hole transport layer interface. Through the –NH2 group and pyridine nitrogen on the 2NF-Py molecule, which interact with interfacial uncoordinated Pb2+ and free I–, defects are effectively passivated. Meanwhile, the F group on the 2NF-Py pyridine ring increases the electrostatic center shift, thereby improving its reaction activity and enhancing its defect passivation capability. As a result, an efficiency increases from 18.07 to 21.82% was achieved at a low concentration of 0.2 mg/mL, marking the highest efficiency for perovskite solar cells (PSCs) fabricated using a two-step blade-coating process without additional assistance and the device maintained 90% of its initial efficiency after being placed in air for 1536 h.
研究领域:
材料科学
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光伏技术
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纳米技术
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化学工程
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固体物理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xian Xie,Yanzhuo Gou,Kai Zhang,Wei Zhang,Jiaqi Zhang,Jie Liu,Shihao He,Jinhua Li,Xianbao Wang,Liangyou Lin
The δ-phase of formamidinium lead iodide (FAPbI 3 ) is widely regarded as detrimental to achieving high efficiency and stability in perovskite solar cells (PSCs) due to its lack of optical activity. In fact, the δ-FAPbI 3 is crucial for the crystal growth of α-FAPbI 3 and establishing a Type-I band alignment with the α-phase FAPbI 3 in PSCs. In this work, we proposed that 1-(4-pyridyl) piperazine (PPDA) not only can successfully achieve controllable modulation of the α-phase/δ-phase ratio in FAPbI 3 , but also increase the transition temperature of δ-FAPbI 3 to α-FAPbI 3 through strong hydrogen bonding interaction. Moreover, we observed that with increasing annealing temperature, the breakage of hydrogen bonds between PPDA and FA + facilitates the complete phase transition from δ-FAPbI 3 to α-FAPbI 3 , while the liberated PPDA molecules preferentially adsorb onto the (110) facet of α-FAPbI 3 , promoting its oriented growth. Based on this strategy, the PPDA-treated device achieved a power conversion efficiency (PCE) of 23.31 %, which was further improved to 24.81 % after passivation treatment, which is one of the highest PCE among PSCs dominated by (110) preferred orientation and δ-phase modulation. Moreover, the devices exhibited remarkable operational stability, maintaining 87.4 % of its initial performance after 1150 h of storage without encapsulation. These findings underscore the importance of rational δ-phase regulation, presenting a synergistic design strategy that provides new theoretical insights and practical approaches for the development of high-performance PSCs.
研究领域:
材料科学
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光伏技术
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纳米结构调控
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能源材料
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表面化学
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晶体工程
·
功能材料
✓ 已验证
产品关联
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
·
可再生能源
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化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2022
·Vol. 65
·期 6
·1185-1195
·
IF 10.138
Li Hongshi,Liu Zhenghao,Chen Zijing,Tan Shan,Zhao Wenyan,Li Yiming,Shi Jiangjian,Wu Huijue,Luo Yanhong,Li Dongmei,Meng Qingbo
Defect states in perovskite films restrict the interfacial stability and open-circuit voltage of perovskite solar cells. Here, aiming at superior interfacial passivation, we investigate the reconfiguration of perovskite interface by the interaction between a series of quaternary ammonium bromides (QAB) and lead—halide (Pb—X) octahedrons. Bromide—iodide substitution reaction or R 4 NBr addition reaction may occur on the perovskite surface, which is related to the steric hindrance of quaternary ammonium cations. On this basis, the perovskite surface morphology, band structure, growth orientation and defect states are reconstructed via the R 4 NBr addition reaction. This ordered lead—halide adduct could effectively repair the imperfect perovskite/hole transportation layer interface to suppress non-radiative recombination and ion migration toward ultralong carrier lifetime surpassing 10 µs. The resulting perovskite solar cells yield the efficiency of 23.89% with steady-state efficiency of 23.70%. The passivated cells can sustain 86% of initial efficiency after 200-h operation, which is attributed to the passivation effect and hydrophobic characteristics. This work provides an avenue for reconfiguring perovskite surface by QABs.
研究领域:
材料科学
·
太阳能
·
化学
·
物理
✓ 已验证
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
✓ 已验证
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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 4
·2794-2806
·
IF 2.1
Li Shengnan,Meng Haoyan,Fan Wentao,Shen Junqing,Xu Shengang,Liu Yingliang,Cao Shaokui
Abstract Woven resistive random access memory (RRAM) is a promising subject in flexible wearable electronic devices. In this work, polyvinylammonium iodate (PVAm·HI) is added to the FAPbI 3 perovskite precursor solution to fabricate a flexible fibrous woven RRAM array by improving the flexibility and stability of FAPbI 3 perovskite. The long carbochain polymer backbone of PVAm serves as nucleation sites and a growth template to improve the perovskite crystallization process, and to in situ crosslink the perovskite grains at the crystal interface. The functional Al@FAPbI 3 :PVAm fibers are then prepared by solution dip-coating to assemble the fibrous crosspoint RRAM device with the structure of Al@FAPbI 3 :PVAm/Al by crossing bare aluminum (Al) fibers with functional fibers. Compared to a pristine device, the PVAm-modified devices exhibit a considerable improvement in the ON/OFF ratio and environmental stability. Specifically, the 2% PVAm-modified FAPbI 3 RRAM devices show an evident bipolar resistive switching (RS) behavior with a high ON/OFF ratio of 10 9 , which can easily achieve multilevel storage by setting the compliance current ( I cc ) to increase the storage density in the crosspoint array. Interestingly, a 100-times bent plastics-encapsulated device still exhibits a good RS behavior. This work provides a facile approach to achieve high-density storage in flexible wearable electronic devices.
Graphical Abstract
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2023
·
IF 18.9
Mingxuan Lv,Ning Li,Gan Jin,Xiaoyan Du,Xutang Tao,Zhaolai Chen
Long carrier diffusion length is important for optoelectronic devices that require large electrode spacing or thick active layers. Formamidinium lead triiodide (FAPbI 3 ) perovskite is a promising candidate with ultra-long carrier diffusion length, but the existence of internal tensile strain and formation of ion vacancies make its photoactive black phase thermodynamically unstable. Herein, phase-stable FAPbI 3 -based single crystals with negligible absorption loss are achieved by synergy of iodide immobilization and compressive strain. Incorporation of guanidinium (GA + ) cations strengthens the interaction with the inorganic framework and suppresses the formation of iodide ion vacancies. Besides, the interface compressive strain introduced from the indium tin oxide (ITO) substrate counteracts the lattice tensile strain. The as-grown GA 0.015 FA 0.985 PbI 3 single crystals exhibit no phase transition after storage in air for 2,000 h. Moreover, the GA 0.015 FA 0.985 PbI 3 single crystals exhibit ultra-long electron carrier diffusion length of about 600 μm, which is a record value for perovskite materials and only half of silicon single crystals.
研究领域:
材料科学
·
光电材料
·
晶体工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）