Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·3145-3153
·
IF 10.733
Bing Liu,Rongli Cui,Huan Huang,Xihong Guo,Jinquan Dong,Huanli Yao,Ying Li,Dangui Zhao,Jiahao Wang,Jing Zhang,Yu Chen,Baoyun Sun
In this study, the stability mechanism of the optimized methyl ammonium lead triiodide (CH3NH3PbI3, MAPbI3)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) perovskite active layer upon exposure to moisture, light, and heating was investigated. For the first time, the existence of high-valence lead arising from PCBM is confirmed by X-ray absorption fine spectroscopy (XAFS) based on synchrotron radiation, which helps to form stronger Pb–I bonds and facilitate carrier transport. Moreover, the degree of disorder of perovskites and the [PbI6]4− octahedral distortion are significantly improved, as well as the crystallization both on the surface and in the bulk. The result of this study provides a fundamental understanding of the functions of additives with electron-withdrawing properties (e.g., PCBM) in perovskite materials and could specifically be extended to systematically design and fabricate high-efficiency and stable solar cells.
研究领域:
材料科学
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光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Lei Zhang,Wenguang Hu,Mu He,Kun Xu,Zheng Pan
Halide perovskite materials exhibit poor optoelectronic properties under hostile conditions, such as water, therefore interpretable machine learning models of halide perovskite systems under hostile conditions are necessary. In this article, we employ machine learning methods to explore cosensitizer-based halide perovskite films in aqueous solution, with the introduction of multiple types of light-absorbing molecules to modify the perovskite/TiO2 interface. Chemical insights are provided based on the analysis of the molecular descriptors, suggesting the importance of the electrostatic and electrotopological features as well as the chemical compositions and functional groups of the interlayer molecules. Experiments are carried out to validate the machine learning model, and fair agreements between the machine learning model and the experimental results are achieved; this leads to the identification of alternative cosensitizers that offer promising optoelectronic properties in aqueous solution. This article highlights the model interpretability to predict and understand the halide perovskite-based films, and the approach outlined here can be generalized to design other surface systems.
研究领域:
材料科学
·
机器学习
·
光伏技术
·
表面化学
·
计算化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Dengkun Chen,Yusha Xie,Tao Chen,Tao Zhang,Yaosong Huang,Xiaoyan Qiu
Solution-processed NiO film is widely applied as the hole transport layer (HTL) of metal halide perovskite solar cells (PSCs). In general, a process temperature over 300 °C is necessary to improve the nucleation and crystallization of NiO grains. This temperature is higher than the glass transition temperature of most low-cost flexible substrates . In this paper, NiO nanoparticle water solution was prepared to spin-coat NiO films at a treatment temperature of 100 °C. The solar cell with the invert planar structure of ITO/NiO/CH 3 NH 3 PbI 3 /ZnO/Ag presented a power conversion efficiency of 11.24 %, which is comparable with that of similar CH 3 NH 3 PbI 3 solar cells with the NiO HTLs prepared at the high temperature. The water-processed NiO HTL greatly decreases the process temperature and simplifies the preparation process of PSCs, showing promising applications in low-cost flexible PSCs.
研究领域:
材料科学
·
太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2015
·
IF 10.325
Weidong Zhu,Chunxiong Bao,Faming Li,Tao Yu,Hao Gao,Yong Yi,Jie Yang,Gao Fu,Xiaoxin Zhou,Zhigang Zou
A facile halide exchange route based on CH 3 NH 3 Br solution post-treatment has been successfully employed to transform the two-step spin-coated CH 3 NH 3 PbI 3 films into the CH 3 NH 3 PbI 3− x Br x films, whose morphologies and compositions could be modified simultaneously. With the increase of CH 3 NH 3 Br solution concentration, the CH 3 NH 3 PbI 3− x Br x films exhibited increased grain size, prolonged charge carrier lifetime, and enlarged bandgap with slightly reduced light absorption compared with the parent CH 3 NH 3 PbI 3 film. The mesostructured perovskite solar cells based on the CH 3 NH 3 PbI 3− x Br x films yielded the optimal power conversion efficiency (PCE) of 14.25%, which is much higher than that of device with the parent CH 3 NH 3 PbI 3 film. In particular, the device based on the CH 3 NH 3 PbI 3− x Br x film retained up to 93% of its original PCE after exposed to air for 14 days without any encapsulation, presenting a favorable stability. Our work suggests a novel and attractive way to fabricate high-performance perovskite solar cells with excellent stability.
研究领域:
材料科学
·
能源工程
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2016
·Vol. 4
·期 4
·473-478
·
IF 2.557
Yangyang Wang,Jiaming Luo,Riming Nie,Xianyu Deng
Despite the rapid progress of the power conversion efficiency (PCE) of perovskite solar cells, the reproducibility, stability, and large-scale production are major challenges. Here, we present a simple and quick solution-depositing process to achieve high-quality perovskite films by adding an insulating polymer of polyacrylonitrile (PAN) as a film-forming additive into the CH 3 NH 3 PbI 3 solution. With the CH 3 NH 3 PbI 3 :PAN films serving as an active layer, planar heterojunction perovskite solar cells show a PCE of 13.08 % at an area of 0.12 cm 2 and 7.32 % at a large area of 1.0 cm 2 . The PCE loss is only about 40 % from the small-area to larger-area devices fabricated by using a solution-based deposition process. The measurements were performed in air without any device encapsulation. We also used the conjugated polymer poly(3-hexylthiophene) (P3HT) as the alternative for PAN. The device performance indicates that the conjugated polymer is unsuitable as the additive, which we attribute to the photo-induced charge transfer between CH 3 NH 3 PbI 3 and P3HT.
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
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Ziqiu Ren,Na Wang,Menghua Zhu,Xin Li,Jingyao Qi
The simple assembling process and lower manufacturing cost are crucial for wide application of perovskite solar cells. In this work, we report an efficient interface passivation strategy for preparing high-performance planar perovskite solar cells, which does not require well-controlled moisture and oxygen atmosphere. A NH 4 F solution-based additive is introduced to passivated TiO 2 electron transfer layer, which offers reduction of oxygen-induced defects and residual surface hydroxyl groups , and lower trap state level. Using a typical planar structure of FTO/NH 4 F-TiO 2 /CH 3 NH 3 PbI 3 /Spiro-OMeTAD/Au, the champion device achieves a power conversion efficiency of 15.61%. After 28-day durability test, the device with NH 4 F-treated TiO 2 storing in air without any encapsulation exhibits a little efficiency loss (<10%). Our work demonstrates a generic approach to develop air-processed efficient planar perovskite solar cells by interface engineering for future commercialization.
研究领域:
材料科学
·
太阳能
·
电气工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2206053
·
IF 19.924
Zhi Zhang,Ziming Xiong,Yao Yao,Derong Wang,Zhiqian Yang,Pin Zhang,Qing Zhao,Wenke Zhou
Electronic devices have brought huge convenience to daily lives; however, a large amount of electromagnetic radiation pollution is generated. Therefore, an urgent demand for electromagnetic wave absorbing materials featuring “low thickness, wide frequency band and strong absorption” is put forward. Here, a strategy of introducing a conductive carbon nanotubes (CNTs) network into CH 3 NH 3 PbI 3 (MAPbI 3 ) is developed to construct an electromagnetic wave absorbing system. As the absorption center, MAPbI 3 dominates the absorption band via an electric polarization process. Meanwhile, the CNTs construct an efficient conductive network, which supply a transmission path for free electrons inside the MAPbI 3 crystals and enhance conduction loss. In comparison with the insulated network formed by MoO 3 /MAPbI 3 , it is speculated that the broadened absorption bandwidth and reduced absorption thickness originate from the conductive network of CNTs. As a result, when the CNTs is 7.7% (mass ratio), the reflection loss strength of MAPbI 3 /CNTs reaches −57.71 dB at 13.96 GHz and the corresponding effective absorption bandwidth is 6.32 GHz (11.68–18.00 GHz), with an absorber thickness of 1.96 mm. The method of constructing conductive network proves a great potential of hybrid perovskite in the field of electromagnetic wave absorption and provides feasible strategies for the absorption regulation of dielectric loss-type materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2020
·
IF 0
Yilong Song,Liqi Li,Weihui Bi,Mingwei Hao,Yifei Kang,Anran Wang,Zisheng Wang,Hanming Li,Xiaohui Li,Yanjun Fang,Deren Yang,Qingfeng Dong
Organic-inorganic halide perovskites (OIHPs) are recognized as the promising next-generation X-ray detection materials. However, the device performance is largely limited by the ion migration issue of OIHPs. Here, we reported a simple atomistic surface passivation strategy with methylammonium iodide (MAI) to remarkably increase the ion migration activation energy of CH3NH3PbI3 single crystals. The amount of MAI deposited on the crystal surface is finely regulated by a self-assemble process to effectively suppress the metallic lead defects, while not introducing extra mobile ions, which results in significantly improved dark current stability of the coplanar-structure devices under a large electric field of 100 V mm-1. The X-ray detectors hence exhibit a record-high sensitivity above 700,000 μC Gyair‐1 cm‐2 under continuum X-ray irradiation with energy up to 50 keV, which enables an ultralow X-ray detection limit down to 1.5 nGyair s-1. Our findings will allow for the dramatically reduced X-ray exposure of human bodies in medical imaging applications.
研究领域:
材料科学
·
医学成像
·
半导体物理
✓ 已验证
DOI
VACUUM
·
2022
·
IF 4.11
Cong Peng,Baizhen Qian,Qianliu Yin,Meifeng Xu,Yonglong Jin,Chaonan Wang,Xiyuan Ma,Tian Xu
The photoelectronic materials of hybrid organic-inorganic halide perovskite (HHPs) materials are an important research field. However, the defects on the surface of perovskite films need to be solved. For organic-inorganic halide perovskite materials, oxygen passivation has been regarded as an effective and convenient method to inhibit non-radiative recombination. In this paper, the unannealed CH 3 NH 3 PbI 3 precursor films were passivated by oxygen plasma for different irradiation times. The prepared perovskite films have large grain sizes, lower trap density, improved crystallinity, and strong absorption. The J-V curve shows that the HHPs solar cells with oxygen treatment increase the solar cell's overall photoelectric conversion efficiency (PCE) from 10.24% to 14.23%. Experimental results and analysis demonstrate that oxygen plasma successfully passivates the surface defects of perovskite, minimizes non-radiation recombination, and enhances device stability.
研究领域:
材料科学
·
太阳能电池技术
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Feng Zhang,Sheng Huang,Peng Wang,Xiaomei Chen,Suling Zhao,Yuping Dong,Haizheng Zhong
Because of the superior optical properties and potential applications in display technology, colloidal synthesis of halide perovskite quantum dots has been intensively studied. Although great successes have been made in the fabrication of green emissive CH3NH3PbBr3 quantum dots, the fabrication of stable iodide-based CH3NH3PbI3 quantum dots remains a great challenge because of their sensitivity to moisture in the open air. Even in a glovebox, the colloidal CH3NH3PbI3 quantum dots obtained from N,N-dimethylformamide suffer from instability caused by fast degradation within days to weeks. In this work, we investigated the interactions between perovskite precursors and various polar solvents as well as their influence on the crystallization of CH3NH3PbI3 in reprecipitation synthesis. By gaining chemical insight into the coordination effects, we can explain the degradation of CH3NH3PbI3 to the defective crystals with coordinated solvents on the surface and/or intrinsic inner iodine vacancies. On the basis of this understanding, we fabricated air-stable CH3NH3PbI3 quantum dots with a tunable size from 6.6 to 13.3 nm by selecting noncoordinated acetonitrile as a good solvent through ligand-assisted precipitation synthesis. The fabrication can be processed under ambient conditions, and the resulting CH3NH3PbI3 quantum dots exhibit tunable emission with high photoluminescence quantum yields (maximum of ∼46%) as well as good stability. Moreover, the quantum confinement effects in CH3NH3PbI3 quantum dots were discussed by correlating the size-dependent photoluminescence properties with theoretical calculations, which can be described by the infinite quantum well approximation model.
研究领域:
材料科学
·
纳米技术
·
钙钛矿光电子学
·
胶体化学
·
量子点
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2017
·Vol. 61
·期 1
·65-72
·
IF 3.956
Yao Xin,Liang Junhui,Li Tiantian,Fan Lin,Shi Biao,Wei Changchun,Ding Yi,Li Yuelong,Zhao Ying,Zhang Xiaodan
Suitable electron transport layers are essential for high performance planar perovskite heterojunction solar cells. Here, we use ZnO electron transport layer sputtered under oxygen-rich atmosphere at room temperature to decrease the hydroxide and then suppress decomposition of perovskite films. The perovskite films with improved crystallinity and morphology are achieved. Besides, on the ZnO substrate fabricated at oxygen-rich atmosphere, open-circuit voltage of the CH 3 NH 3 PbI 3 -based perovskite solar cells increased by 0.13 V. A high open-circuit voltage of 1.16 V provides a good prospect for the perovskite-based tandem solar cells. The ZnO sputtered at room temperature can be easily fabricated industrially on a large scale, therefore, compatible to flexible and tandem devices. Those properties make the sputtered ZnO films promising as electron transport materials for perovskite solar cells.
研究领域:
光伏学
·
材料科学
·
可再生能源
·
薄膜太阳能电池
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Qiuyan Hao,Yixia Chu,Xuerong Zheng,Zhenya Liu,Liming Liang,Jiakun Qi,Xin Zhang,Gang Liu,Hui Liu,Hongjian Chen,Caichi Liu
Recently, planar perovskite solar cells based on CH 3 NH 3 PbI 3 have attracted many researcher's interest due to their unique advantages such as simple cell architecture, easy fabrication and potential multijunction construction comparing to the initial mesoporous structure. However, the preparation of planar perovskite films with high quality is still in challenge. In this paper, we developed a vapor-assisted solution process using a novel and green solvent of 1-Ethyl-2-pyrrolidone (NEP) instead of the traditional N, N-dimethylformamide (DMF) to construct a high-quality perovskite CH 3 NH 3 PbI 3 thin film with pure phase, high compactness, small surface roughness and controlled size. The phase evolution and growth mechanism of the perovskite films are also discussed. Utilizing the NEP of low volatility and moderate boiling point as solvent, we dried the PbI 2 -NEP precursor films at different temperature under vacuum and then obtained PbI 2 thin films with different crystalline degree from amorphous to highly crystalline. The perovskite films with crystal size ranged from hundreds of nanometers to several micrometers can be prepared by reacting the PbI 2 films of different crystalline degree with CH 3 NH 3 I vapor. Moreover, planar-structured solar cells combining the perovskite film with TiO 2 and spiro-OMeTAD as the electron and holes transporting layer achieves a power conversion efficiency of 10.2%.
研究领域:
材料科学
·
光伏器件
·
纳米科技
·
无机非金属材料
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）