FERROELECTRICS
·
2019
·
IF 0.697
Weiwei Li,Jiangtao Zeng,Liaoying Zheng,Huarong Zeng,Chunbo Li,Abdelhadi Kassiba,Chulhong Park,Guorong Li
CH3NH3PbI3 (MAPbI3) has attracted great interest of researchers for its impressively high efficiency in solar cells. Researchers have debated whether or not MAPbI3 is ferroelectric for a long time. In this work, the ferroelectric hysteresis loops, dielectric properties, the real part of impedance and domain structure of the samples synthesized in ambient air (not in a glove box) are investigated. No domain switching current is found in the pellets and films at room temperature, but ferroelectric domains are observed in the films with in plane and out of plane conurations. The dielectric constant as a function of temperature shows that there is no ferroelectric to paraelectric phase transition. The complexity and uncertainty concerning the ferroelectricity of the samples synthesized in ambient air are the same as those synthesized in a glove box.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 2
·260
·
IF 4.7
Tao Zhang,Xuewen Han,Yukang Peng,Han Yu,Junwen Pu
With the rapid development of modern society, our demand for energy is increasing. And the extensive use of fossil energy has triggered a series of problems such as an energy crisis and environmental pollution. A moisture-enabled electric generator (MEG) is a new type of energy conversion method, which can directly convert the ubiquitous moisture in the air into electrical energy equipment. It has attracted great interest for its renewable and environmentally friendly qualities. At present, most MEGs still have low power density, strong dependence on high humidity, and high cost. Herein, we report the development of a high-efficiency MEG based on a lignocellulosic fiber frame with high-power-density, all-weather, and low-cost characteristics using a simple strategy that optimizes the charge transport channel and ion concentration difference. The MEG devices we manufactured can generate the open-circuit voltage of 0.73 V and the short-circuit current of 360 μA, and the voltage can still reach 0.6 V at less than 30% humidity. It is possible to drive commercial electronic devices such as light-emitting diodes, electronic displays, and electronic calculators by simply connecting several electric generators in series. Biomass-based moisture-enabled electric generation has a low cost, is easy to integrate on a large scale, and is green and pollution-free, providing clean energy for low-humidity or high-electricity-cost areas.Keywords:moisture-enabled;electricity generator;wood modification;ambient air;ionic transport
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhipeng Wang,Tingting Ma,Junkai Wang,Shaorun Zhu,Mei Zhang,Min Guo
Amine-based molecules are frequently utilized for defect passivation in perovskite films. However, the passivation effect can vary considerably depending on the structural differences of the amine molecules. In this study, we selected small-sized formamidine iodide (FAI), long-chain octylammonium iodide (OAI), and aromatic nicotinic acid (NA) to passivate surface defects in perovskite films. The charge transport in perovskite solar cells (PSCs) was inhibited by the excessively long alkyl chain of OAI but was enhanced by the π-conjugated structure of NA. Consequently, the power conversion efficiency (PCE) of OAI and NA-passivated PSCs decreased by 0.91% and increased by 0.23%, respectively. Interestingly, FAI was found to react preferentially with the PbI 2 at the grain boundary of perovskite films, promoting secondary grain growth and resulting in a 21% increase in grain size. Due to the reduction in grain boundaries and the combined passivation of MA + and I − vacancies, the PCE of FAI-passivated PSCs increased from 18.63% to 19.35% in ambient air and maintained 91% of their initial values after 76 days of storage under conditions of 20 ± 5 °C and <5% RH. This study introduces a promising strategy for selecting an appropriate amine molecule for surface passivation in efficient and stable fully-ambient air processed PSCs.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Jing Lv,Jilin Wang,Yuanhang Cheng,Jiaonan Sun,Menglan Lv,Ke Jin,Fei Long,Aurora Rizzo,Feng Hao,Keyou Yan,Jingjing Chang,Chenyi Yi,Junqiao Ding,Yong Ding,Chuantian Zuo,Liming Ding
Wide-bandgap (WBG) perovskites are critical for advancing tandem solar cell technology, yet their fabrication remains constrained by narrow processing windows and environmental instability. A synergistic alkylammonium salt additive strategy coupled with a mild gas-flow-assisted crystallization method is presented to produce ambient-air-processed WBG perovskite solar cells (PSCs) with improved reproducibility and scalability. Co-utilizing long-chain alkylammonium chlorides (xACls) and methylammonium chloride (MACl) reduced gas-flow speed requirements while expanding the crystallization kinetics window, suppressing non-radiative recombination and defects, which are verified by fluorescence lifetime imaging microscopy (FLIM), in situ UV–vis spectroscopy, and XRD. High-quality Cs 0.2 FA 0.8 PbI 2.3 Br 0.7 films are successfully prepared under a low gas flow speed (≈2.7 m s −1 ), which is much lower than the traditional gas quenching method (>26 m s −1 ). Cs 0.2 FA 0.8 PbI 2.3 Br 0.7 solar cells made by using 12ACl/MACl additives yielded a champion power conversion efficiency (PCE) of 19.72% ( V oc : 1.238 V), which is among the highest efficiency for WBG PSCs made in ambient air. This method has the advantages of high humidity tolerance (PCE >19% for cells made under 20–65% RH), compatibility with cost-effective fan drying, elimination of anti-solvents, and >70% inert gas-flow intensity reduction, establishing an eco-friendly scalable protocol that bridges lab-to-industry translation for high-performance WBG PSCs.
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
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Gangyi Zeng,Guangyao Liu,Tiantian Wang,Lingling Wen,Jiangning Li,Yan Meng,Ziqiu Ren,Xin Li
Triple-cation CsFAMA perovskite solar cells (PSCs) have gained great attention because of their excellent stability. Buried interface management is one of the most effective methods to further improve device performance; however, such a strategy has not been extensively studied in air-processed triple-cation PSCs. Herein, we report an effective management strategy that incorporates ionic liquids (ILs) of 1-butyl-3-methylimidazole hexafluorophosphate (BMIMPF6) to modify the buried interface. The synergistic effect of BMIMPF6 is revealed by employing several characterization methods, including time-of-flight secondary ion mass spectrometry and inductively coupled plasma mass spectrometry. It was found that BMIMPF6 can significantly coordinate with Sn4+ and fill the oxygen vacancy defects from one side of the electron transport layer, and simultaneously bond with uncoordinated Pb2+ from the other side of the perovskite layer, leading to reduced nonradiative recombination losses and enhanced carrier extraction. More importantly, such an IL “bridge” enabled BMIMPF6 to exist at the buried interface, which avoids damage to the passivating layer in the next spin-coating process for achieving the perovskite film. Moreover, BMIMPF6 also penetrates the perovskite film and regulates the crystallinity of perovskite. As a result, the BMIMPF6-modified device fabricated in ambient air without glove boxes or dry rooms delivers a champion power conversion efficiency (PCE) of 21.74%. The unencapsulated device maintains 77.5% of its initial PCE after being stored in ambient air for more than 3500 h. Additionally, the lead leakage rate from the perovskite film is reduced. This work provides a facile and low-cost method to fabricate high-performance all-air-processed PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 26
·13448-13456
·
IF 8.867
Mengna Sun,Fei Zhang,Hongli Liu,Xianggao Li,Yin Xiao,Shirong Wang
Here, we report a rapid and simple process to prepare perovskite solar cells in ambient air by adding 2-pyridylthiourea in the precursor solution. 2-Pyridylthiourea can not only promote the conversion of 2-D PbI2 to tetragonal CH3NH3PbI3 crystals, but also improve the quality of the perovskite absorber layer via enhancing the uniformity and the size of the crystal grains. The perovskite solar cells with the addition of 2-pyridylthiourea at a concentration of 0.5 mg mL−1 exhibited a remarkable overall power conversion efficiency (PCE) of 18.2%, which is among the highest PCE of CH3NH3PbI3-based devices fabricated in ambient air. It also showed an 18% increase and less hysteresis compared with the cells without additives. Importantly, the devices with 2-pyridylthiourea show relatively better stability compared to reference devices when aged under ambient air of 55 ± 5% relative humidity in the dark and under 65 °C after 30 days. The presented results clearly show that 2-pyridylthiourea can be an additive candidate for tuning the morphology of perovskite thin films, which may be a new direction for large-scale production of PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tingting Zhong,Kunpeng Tang,Wangshu Xu,Lei Shi,Jingjing Dong,Hao Liu,Jie Xing,Huiying Hao
Carbon-based all-inorganic perovskite solar cells (PSCs) have attracted tremendous attention due to the higher intrinsic stability, which is beneficial to lower fabrication costs and further commercial applications. Furthermore, for the purpose of promoting the industrialization of PSCs, it is crucial to explore preparation methods in ambient air condition. Herein, ammonium acetate (NH 4 Ac) is added into the antisolvent for the first time in carbon-based all-inorganic PSCs under the full ambient air condition. It could improve the quality of perovskite films by adjusting the nucleation density and utilizing intermediate phase to retard crystallization. By regulating the concentrations of NH 4 Ac, the perovskite films with dense and pinhole-free, large grain size, few grain boundaries and less defects are finally formed. Ultimately, the optimal device achieved a high efficiency of 15.43%, which is a new record value for carbon-based all-inorganic PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Tingting Zhong,Lei Shi,Huiying Hao,Jingjing Dong,Kunpeng Tang,Xiang Xu,Shindume Lomboleni Hamukwaya,Hao Liu,Jie Xing
In order to further promote the commercial application of perovskite solar cells (PSCs), it is particularly important to fabricate devices in the ambient air condition. Herein, we explore a simple method to reproduce high-efficiency and stable PSCs using the one-step anti-solvent deposition conducted in the full ambient air. NH4Ac (ammonium acetate), which is green and environmentally friendly, is first introduced into an anti-solvent (ethyl acetate) to enhance the photovoltaic performance and stability of devices. NH4+ causes the intermediate phase to undergo a process of cation exchange, thereby delaying crystallization. Ac– makes the additive and A-site cation form hydrogen bonds, which in turn makes the intermediate phase more stable. The dual effects of NH4+ and Ac– delay the crystallization of the perovskite film, reduce the density of defect states, and decrease the non-radiative recombination of carriers. By optimizing the concentration of NH4Ac, a champion power conversion efficiency (PCE) of 20.41% and an average PCE of 19.46 ± 0.64% are achieved, which is currently one of the highest efficiencies in fabricating PSCs under the full ambient air condition. Furthermore, the corresponding PSCs without encapsulation can maintain 82% of its initial PCE when stored in full ambient air condition (30–40% RH) for 30 days.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Energy
·
2023
·Vol. 8
·期 10
·1158-1167
·
IF 56.7
Yan Luyao,Huang Hao,Cui Peng,Du Shuxian,Lan Zhineng,Yang Yingying,Qu Shujie,Wang Xinxin,Zhang Qiang,Liu Benyu,Yue Xiaopeng,Zhao Xing,Li Yingfeng,Li Haifang,Ji Jun,Li Meicheng
The fabrication of perovskite solar cells (PSCs) in ambient air can accelerate their industrialization. However, moisture induces severe decomposition of the perovskite layer, limiting the device efficiency. Here we show that sites near vacancy defects absorb water molecules and trigger the hydration of the perovskite, eventually leading to the degradation of the material. We demonstrate that guanabenz acetate salt eliminates both cation and anion vacancies, blocking the perovskite hydration and allowing the crystallization of a high-quality film in ambient air. With guanabenz acetate salt, we prepare PSCs in ambient air with a certified efficiency of 25.08%. The PSCs without encapsulation maintain around 96% of their initial efficiency after 2,000 hours of ageing in ambient air and after 500 hours of operating at the maximum power point under simulated air mass (AM) 1.5 G solar light in a N 2 atmosphere. The encapsulated devices retained 85% of their initial efficiency after 300 hours under damp heat conditions (85 °C and 85% relative humidity).
研究领域:
材料科学
·
可再生能源
·
化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 11
·3398
·
IF 4.412
Yi Long,Kun Liu,Yongli Zhang,Wenzhe Li
Inorganic cesium lead halide perovskites, as alternative light absorbers for organic–inorganic hybrid perovskite solar cells, have attracted more and more attention due to their superb thermal stability for photovoltaic applications. However, the humid air instability of CsPbI2Br perovskite solar cells (PSCs) hinders their further development. The optoelectronic properties of CsPbI2Br films are closely related to the quality of films, so preparing high-quality perovskite films is crucial for fabricating high-performance PSCs. For the first time, we demonstrate that the regulation of ambient temperature of the dry air in the glovebox is able to control the growth of CsPbI2Br crystals and further optimize the morphology of CsPbI2Br film. Through controlling the ambient air temperature assisted crystallization, high-quality CsPbI2Br films are obtained, with advantages such as larger crystalline grains, negligible crystal boundaries, absence of pinholes, lower defect density, and faster carrier mobility. Accordingly, the PSCs based on as-prepared CsPbI2Br film achieve a power conversion efficiency of 15.5% (the maximum stabilized power output of 15.02%). Moreover, the optimized CsPbI2Br films show excellent robustness against moisture and oxygen and maintain the photovoltaic dark phase after 3 h aging in an air atmosphere at room temperature and 35% relative humidity (R.H.). In comparison, the pristine films are completely converted to the yellow phase in 1.5 h.Keywords:CsPbI2Br;perovskite solar cells;ambient air temperature assisted crystallization;film quality;photophysical properties
研究领域:
材料科学
·
光伏技术
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 8
·2200150
·
IF 9.173
Chengfeng Ma,Chunxu Xiang,Xinge Liu,Bingyan Li,Xinyu Li,Shuaiqi Han,Qi Dai,Weibo Yan,Hao Xin
Solution-processed chalcopyrite copper indium gallium sulfoselenide (Cu(In,Ga)(S,Se) 2 , CIGSSe) thin-film solar cells have achieved efficiency beyond 18% and have great potential as an alternative to vacuum-based ones. However, most of the efficient solution-based CIGSSe solar cells are fabricated by spin-coating in an inert atmosphere, which limits the transfer from lab protocol to industrial large-scale production. Herein, a scalable doctor-blading technique is applied to fabricate CuIn(S,Se) 2 (CISSe) absorbers from N,N-dimethylformamide molecular precursor solution in ambient air. With the optimization of the precursor concentration to reduce the residue solvent and change the thermal annealing process from one-step to two-step to separate solvent evaporation and complex decomposition to suppress fluidity, high-quality absorber films with densely packed large grains have been fabricated and a champion CISSe solar cell with a power conversion efficiency of 12.54% has been achieved. Importantly, unlike the spin-coating technique which may cause composition change due to the different solubilities of the precursors, the doctor-bladed film has a composition very close to the precursor solution, which is very important for precise control of the absorber composition for industrial production.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2020
·Vol. 10
·期 22
·2000691
·
IF 25.245
Chenyang Duan,Jian Cui,Miaomiao Zhang,Yu Han,Shaomin Yang,Huan Zhao,Hongtao Bian,Jianxi Yao,Kui Zhao,Zhike Liu,Shengzhong (Frank) Liu
High temperature stable inorganic CsPbX 3 (X: I, Br, or mixed halides) perovskites with their bandgap tailored by tuning the halide composition offer promising opportunities in the design of ideal top cells for high-efficiency tandem solar cells. Unfortunately, the current high-efficiency CsPbX 3 perovskite solar cells (PSCs) are prepared in vacuum, a moisture-free glovebox or other low-humidity conditions due to their poor moisture stability. Herein, a new precursor system (HCOOCs, HPbI 3 , and HPbBr 3 ) is developed to replace the traditional precursors (CsI, PbI 2 , and PbBr 2 ) commonly used for solar cells of this type. Both the experiments and calculations reveal that a new complex (HCOOH•Cs + ) is generated in this precursor system. The new complex is not only stable against aging in humid air ambient at 91% relative humidity, but also effectively slows the perovskite crystallization, making it possible to eliminate the popular antisolvent used in the perovskite CsPbI 2 Br film deposition. The CsPbI 2 Br PSCs based on the new precursor system achieve a champion efficiency of 16.14%, the highest for inorganic PSCs prepared in ambient air conditions. Meanwhile, high air stability is demonstrated for an unencapsulated CsPbI 2 Br PSC with 92% of the original efficiency remaining after more than 800 h aging in ambient air.
研究领域:
材料科学
·
太阳能
·
化学工程
✓ 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）