Surfaces and Interfaces
·
2023
·
IF 6.2
Kaibo Liang,Yunjia Wu,Qingshui Zhen,Yu Zou,Xiuchun Zhang,Chenhao Wang,Puyao Shi,Yangyang Zhang,Weihai Sun,Yunlong Li,Jihuai Wu
In recent years, CsPbBr 3 perovskite solar cells (PSCs) have attracted the attention of a large number of researchers due to their excellent temperature and humidity stability. And in the current studies, due to the lack of suitable solvents to dissolve PbBr 2 and CsBr at the same time, most studies have used sequential solution-processing techniques (SSPTs) to prepare CsPbBr 3 films. However, in the process of the sequential deposition of PbBr 2 and CsBr, the uneven reaction could lead to the generation of impure phase (e.g. CsPb 2 Br 5 and Cs 4 PbBr 6 ), which would deteriorate the photoelectric performance of the device. Here, a solvent-vapor annealing (SA) method has been proposed for fabricating mesoporous PbBr 2 films by exposing the PbBr 2 films in N,N -Dimethylformamide (DMF) vapor environment. The porous PbBr 2 frameworks could facilitate the reaction with CsBr to fully convert into inorganic perovskite CsPbBr 3 . A series of characterization results show that a compact, uniform and high-quality CsPbBr 3 film with large grains was obtained, where the porosity of PbBr 2 scaffold could be tuned by the volume of DMF. Consequently, the devices based on optimized PbBr 2 films treated by SA method achieved a champion power convention efficiency (PCE) of 9.60%, an open-circuit voltage ( V OC ) of 1.54 V, a short-circuit current density ( J SC ) of 7.57 mA cm −2 and a fill factor (FF) of 82.37%, compared with the devices treated by conventional thermal annealing (TA) method achieved a PCE of 8.42%, a V OC of 1.49 V, J SC of 7.31 mA cm −2 and FF of 77.30%. Furthermore, the SA treated devices exhibit more durable stability than TA treated devices, and the SA treated devices still retain 94.28% of its original PCE without any encapsulation in the ambient atmosphere after 30 days.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2408
·
IF 5.076
Kailin Chi,Hansi Xu,Bingtao Feng,Xianwei Meng,Daoyu Yu,Qian Li
Due to the low solubility of CsBr in organic solvents, the CsPbBr3film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr3solar cells. In this study, we introduced InBr3into the PbBr2precursor solution and adjusted the concentration of PbBr2, successfully prepared PbBr2with a porous structure on the compact TiO2(c-TiO2) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr3solar cells with high-quality perovskite film. The results reveal that the porous PbBr2structure and the increasing PbBr2concentration are beneficial to increase the thickness of the CsPbBr3films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr3solar cells obtained after conditions optimization was 5.76%.
研究领域:
材料科学
·
光伏技术
·
纳米技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yang-Wei Wang,Yu Wang,Hao Liang,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
Bismuth telluride-based materials has been applied in thermoelectric cooling wildly, but the properties still can be further enhanced by doping, microstructure controlling and compositing strategies. Herein, we demonstrate an anomalous doping strategy in (Bi, Sb) 2 Te 3 (BST) materials, where the strong n type dopant of PbBr 2 acts as p-type dopant, introducing holes in BST materials. The anomalous doping is attributed to the dissolution of Pb and Br elements into the matrix in a non-stoichiometric ratio, with Pb predominantly occupying Sb vacancies and Br enriching the in-situ generated Sb 2 O 3 , resulting in the increased hole concentration and improved electrical conductivity. The maximum power factor (PF) ultimately increases to 3972 μW m −1 K −2 for the 0.3 mol% PbBr 2 doped BST sample. Moreover, the enhanced multi-scale wavelength phonon scattering centers cause the lattice thermal conductivity fall to 0.52 W m −1 K −1 . Finally, the peak ZT is effectively enhanced to 1.3 at 323 K, which is 22 % higher than that of pristine sample. Furthermore, a direct conversion efficiency of 4.6 % is achieved in a single 0.3 mol% PbBr 2 -doped BST leg at a temperature gradient of ΔT = 200 K. Thus, this study underscores the anomalous PbBr 2 doping in Bi 0.42 Sb 1.58 Te 3 , promoting the wider application of BST-based materials.
研究领域:
材料科学
·
凝聚态物理
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功能材料
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热电转换
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半导体掺杂
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DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Zhanfeng Li,Jinbo Chen,Jingkun Ren,Qinjun Sun,Hua Wang,Junsheng Yu,Yuying Hao
Organometal halide perovskite solar cells (PSCs) have demonstrated exceptional, unparalleled progress in solar cell performance by optimizing the perovskite film morphology, composition , interfaces, and charge collection efficiency. In this work, a PbBr 2 pre-coating layer (PCL) was employed to effectively fabricate a relatively uniform composition perovskite film with large crystal sizes and no voids. We demonstrated that carrier recombination is reduced and charge collection is improved by the interface and interior passivation in PSCs fabricated with PCL process, which leads to a striking enhancement in open-circuit voltage and short circuit current. As a result, a promising power conversion efficiency of 17.38%, showing more than 10% enhancement over the reference devices, was realized in the passivated invert planar PSCs with negligible hysteresis and stable photocurrent output. This study gives a novel compositional passivation process to produce high-efficiency halide PSCs with improved process reproducibility.
研究领域:
材料科学
·
光伏技术
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能源研究
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kailin Chi,Yuechen Zhai,Yao Wang,Xin Zhang,Fucheng Liang,Shibo Wang
The achievement of complete conversion of PbBr 2 films presents a significant challenge in the development of CsPbBr 3 films with consistent growth, comprehensive coverage, and controllable components. To address this challenge, introducing a porous structure in the planar PbBr 2 film is advantageous for facilitating the immersion of CsBr precursor, thereby reducing impurity phase formation and mitigating strain caused by the film volume expansion. In order to accomplish this, indium tribromide (InBr 3 ) was employed as an additive and the InBr 3 (DMF) 3 adduct was utilized to expedite the release of organic molecules in PbBr 2 (DMF), resulting in the transformation of planar PbBr 2 film into porous structures. The growth orientation of PbBr 2 crystals was altered by this transformation, effectively suppressing the generation of metallic Pb impurities in the film. Additionally, it not only optimizes the morphology of CsPbBr 3 film but also reduces impurity phase. As a result, the InBr 3 :CsPbBr 3 perovskite solar cell achieved an efficiency of 7.28 %. The majority of In 3+ ions were concentrated near the buried interface between SnO 2 and InBr 3 :CsPbBr 3 , leading to significant improvements in both non-radiative recombination defect states within the perovskite film and electron injection and collection capabilities within the device.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2026
·
IF 4.3
Yun Tang,Fan Yang,Ruoche Wang,Nan Yan,Yalou Xin,Xiaohu Ren,Hudie Yuan
Perovskite quantum dots (PQDs) possess outstanding optoelectronic properties, yet their practical applications are hindered by intrinsic instability. Although water-induced PbBrOH coatings can enhance PQDs stability, the hydration process remains difficult to control. Excessive water can readily cause PQDs quenching, whereas insufficient water may result in incomplete or non-uniform PbBrOH formation. Here, MAF-6, a metal-organic framework composed of Zn 2+ metal nodes and 2-methylimidazole ligands, is employed to induce the formation of PbBrOH without the direct introduction of water, and the underlying mechanism is systematically elucidated through combined experimental and theoretical analyses. The results revealed that Zn 2+ in MAF-6 coordinates with Br - from PbBr 2 while the labile N-Zn bonds in the imidazole ring are cleaved by Br - , facilitating Pb-O bond formation and the subsequent transformation of PbBr 2 into PbBrOH. The strategy is further extended to diverse MOFs for inducing PbX 2 phase transitions. This work provides a fundamental understanding of the role of MOFs in phase transitions and opens new pathways for designing highly stable PQDs materials.
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DOI
高影响因子
PHYSICA SCRIPTA
·
2020
·Vol. 95
·期 10
·105705
·
IF 1.985
Xiaoyong Gao,Xin Zhang
Compositional stability of perovskites is crucial for perovskite solar cells (PSCs) application because of directly affecting the performance of PSCs. Highly crystallized perovskite MAPbBr3 (MA = CH3NH3) with micronscale crystallites are usually fabricated via the one-step sol-gel process that uses strongly coordinating organic solvents. The two-step sol-gel process using weakly coordinating organic solvent is rarely used to fabricate MAPbBr3 films with relatively small crystallites. However, the two-step sol-gel process is preferred to fabricate PSCs because the residual PbBr2 can prevent the direct contact between electron- and hole-transporting layers. Thus in this work, perovskite MAPbBr3 films are fabricated via two-step sol-gel process using weakly coordinating isopropanol solvent. The compositional stability in dry ambient air and related optical properties of the films are intensively studied by a technique of post-annealing. A compositional transition from MAPbBr3 to PbBr2 occurs with increase of post-annealing temperature (Tpa). The product PbBr2 begins to form in the MAPbBr3 films at approximately 130 °C Tpa, and MAPbBr3 is fully thermally degraded to PbBr2 at 170 °C Tpa. The compositional stability of the films in dry air is inherently determined by instable organic cations (MA)+ and small electronegativity of Br−. The perovskite film initially shows a redshifted and then a blueshifted optical absorption edge with increase of Tpa, which is due to the decrease in film tensile stress and to the enhancement in thermal degradation to PbBr2, respectively. The increase in number of PbBr2 particles and defects in the films remarkably reduces the intensity of the green emission of MAPbBr3.
研究领域:
材料科学
·
太阳能电池
·
光电子学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-11
·
IF 2.8
Mei Xiang,Xiang Zhiwei,Mo Dingdiao,Fu Weihai,Jin Peixuan,Huang Xiaocong,Yang Yuanzheng,Cai Weitong
CsPbBr 3 perovskite solar cells (PSCs) have attracted a lot of attention due to their excellent long-term stability and easy fabrication in humid air. The preparation of the light-absorbing layer is crucial for achieving high efficiency in CsPbBr 3 perovskite solar cells. In this study, methylammonium iodide (CH 3 NH 3 I, MAI) was introduced into the PbBr 2 precursor solution to improve the quality of perovskite films and the photovoltaic performance of PSCs. The spin-coating method was employed to prepare CsPbBr 3 films in ambient air. Firstly, a layer of PbBr 2 film was spin-coated, followed by two spin-coatings of CsBr solution on top of it. By adjusting the content of MAI additives, a PbBr 2 film with a microporous structure was obtained. These porous structures acted as channels for CsBr molecules, enabling them to react fully with PbBr 2 and more favorable for the crystallization of CsPbBr 3 . As a result, we achieved the high-purity, high-crystallinity, and continuous CsPbBr 3 films. Furthermore, we utilized CsPbBr 3 films as the light-absorbing layer in PSCs with a structure of FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 /carbon, a champion power conversion efficiency of 8.02% was achieved, and the unencapsulated device showed excellent long-term stability.
研究领域:
材料科学
·
太阳能
·
纳米技术
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DOI
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Shun-Ping Zhao,Qiang-hong Yu,Ping Yang,Yu Guo,Jie Wang,Heng Xu
Oriented design of crystal structures to obtain specific properties is one of the hot topics in the field of chemistry and materials. In this paper, three organic–inorganic hybrid crystals were synthesized by the reaction of 1-aminopyridinium salts with o -, m -, and p -cyanobenzaldehyde and PbBr 2 . The asymmetric unit of 1 ([1- aminopyridinium][Pb 2 Br 5 ], P 2 1 / m ) contains half of the 1-aminopyridinium cation and the anion forms a zig-zag shaped puckered sheet of [Pb 2 Br 5 ] ∞ ; while 2 ([ m -cyanobenzaldehyde-1-aminopyridinium][PbBr 3 ], Pna 2 1 ) includes a m -cyanobenzaldehyde-1-aminopyridinium Schiff base cation, and the anion forms a [PbBr 3 ] ∞ single chain. On the other hand, 3 ([ p -cyanobenzaldehyde-1- aminopyridinium][PbBr 3 ], P 2 1 / c ) consists of a p -cyanobenzaldehyde-1- aminopyridinium Schiff base cation, with the anion forming a [Pb 2 Br 6 ] ∞ double chain. Structural analysis and energy framework calculations show that 2 possesses stronger π-π stacking and hydrogen bonding interactions, and its lattice energy and thermal stability are higher than those of 1 and 3 . The combined use of CE and dielectric modulus analysis reveals a good correlation between multi-step dielectric relaxation and intermolecular forces. This strategy of modulating the crystal structure and dielectric properties by altering the position of the substituents provides useful assistance in the design of new relaxation dielectric materials.
研究领域:
材料化学
·
晶体工程
·
介电材料
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DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Xiaopeng Han,Xin Wang,Jianyong Feng,Huiting Huang,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
It is important to prepare preferentially oriented films to enhance charge carrier transport in the optoelectronic device applications. For the promising optoelectronic material of CsPbBr3, obtaining its thin films with preferred crystal orientation is highly desirable yet challenging. Herein, (121)-oriented CsPbBr3 perovskite films were successfully obtained by using HBr as the additive for PbBr2 precursor solution in the two-step solution method. Detailed investigations indicate that microstructure tailoring of PbBr2 films via HBr additives plays a crucial role in achieving (121)-oriented CsPbBr3 films. Theoretical calculations and experimental measurements demonstrate high carrier mobility in (121)-oriented CsPbBr3 films, which accords well with photovoltaic tests that the (121)-oriented CsPbBr3 film shows short-circuit photocurrent density as much as 1.68 times than the (101)-oriented one. In comparison with the (101)-oriented CsPbBr3 solar cell, the champion power conversion efficiency of the (121)-oriented CsPbBr3 solar cell increases from 2.56 to 6.91% owing possibly to its higher coverage and carrier mobility. This work not only develops a pathway to prepare compact (121)-oriented CsPbBr3 films but also highlights the importance of crystal orientation engineering in perovskite films for high-performance optoelectronic devices.
研究领域:
材料科学
·
光电材料
·
可再生能源
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DOI
Advanced Sensor Research
·
2024
·
IF 0
Wei Ye,Yaxin Li,Xinyu Zhao,Yaocheng Yang,Xin Wang,Dongqing He,Lu Li,Dongyan Tang,Tengling Ye
This study introduces a novel fluorescent light-up electrospun membrane, integrating PbBr 2 , which serves as an exceptionally selective probe for the detection of cesium ions (Cs + ). Leveraging the superior optical properties of CsPbBr 3 perovskite nanocrystals (PNCs), the researchers employ electrospinning technology to fabricate a test strip, namely PbBr 2 @polyacrylonitrile (PbBr 2 @PAN) nanofiber membranes, capable of swiftly detecting Cs + in water merely by observing changes in the nanocrystals' luminescence with the naked eye. By the introduction of NH 4 + -modified montmorillonite (NH 4 + -MMT), PbBr 2 -MT@PAN nanofiber membranes is obtained. The selectivity and sensitivity to Cs + can be further improved because NH 4 + -MMT endows PbBr 2 -MT@PAN nanofiber membranes with the hydrophilic property and selective adsorption toward Cs + ions. The membrane's fabrication is simple, scalable, and cost-effective, with high cesium selectivity and sensitivity down to 44 ppb. This innovation enables efficient, on-site cesium monitoring critical for environmental safety and nuclear waste management.
研究领域:
分析化学
·
材料科学
·
环境监测
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xingyu Liu,Jinwei Gao,Qianming Wang
The low resistance to moisture will be the main obstacle for the perovskites used in device package and solar cell application. Most of literatures refer to the route that the quantum dots should be incorporated into a wide variety of stabilized hosts. However, the generation of protecting layers requires complicated treatments and decreases solubility or dispersity. Moreover, morphological control of perovskite nanocrystals with the assistance of covering substrate is a big challenge. Self-assembly of colloidal nanocrystals into ordered architectures has caused considerable interests and enabled new ways to manipulate the physicochemical properties for targeted applications. Herein, we describe how inorganic halide perovskites (CsPbBr 3 ) with five different shapes (cubic, dot, sheet, ring and complex-coated) are formed by adjusting the sequence of PbBr 2 , 2-mercapto-3-methyl-4-thiazoleacetic acid (MMTA) and water. Realization of long-term stability and high efficiency requires innovative designs in both internal chemical structure and external interface engineering. PbBr 2 improves the ionic nature of CsPbBr 3 due to its cation supplement strategy. MMTA plays an important role in cross-linking process and the hydrogen bond/coordination interactions can passivate the interfacial surface for optimizing the microstructure. Water is not always detrimental in producing irreversible degradation. The shape evolution from the individual particles into much extended structure leads to the formation of complex-coated- CsPbBr 3 (CC- CsPbBr 3 ). It can retain 40% of its original emission intensity in water for 36 h, whereas the typical cubic CsPbBr 3 exhibits poor performance during water tolerance experiments and has been completely quenched within 12 h. A wide color gamut system with 153% of National Television System Committee (NTSC) space is developed for CC- CsPbBr 3 .
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
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