CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weizhi Zhang,Taiyang Zhang,Lixia Qin,Shi-Zhao Kang,Yixin Zhao,Xiangqing Li
The purity of PbI 2 plays a critical role in determining the performance, stability, and reproducibility of perovskite solar cells (PSCs). However, the cost of high-purity PbI 2 is much higher than that of low-purity, and even the expensive high-purity PbI 2 suffers from batch variance issues. Although several purification methods have been developed, the straightforward and rapid purification of PbI 2 remains a challenge. The solar cell efficiency achieved by previous direct purification of PbI 2 is much lower than the state-of-the-art value. Therefore, people still doubt whether the low-purity PbI 2 is eligible for the fabrication of efficient solar cells even after purification. Herein, we report an anti-solvent engineering strategy for the rapid and facile purification of low-purity PbI 2 , which allows us to efficiently eliminate both the insoluble and soluble impurities. Eventually, the formamidinium-cesium (FA 0.95 Cs 0.05 PbI 3 ) PSCs made from directly purified PbI 2 show much enhanced performance and reproducibility. A champion power conversion efficiency of 23.91% is realized, which is the highest value ever reported for PSCs made from purified low-purity PbI 2 . The in-depth PbI 2 purification mechanism is further discussed from the perspective of solvent-coordination and solvent–solvent interactions by combining the donor number (D N ) value of solvents and Hansen solution parameters. The results reveal that the weaker interaction between PbI 2 and solvent, together with the stronger interaction between solvent and anti-solvent, is crucial for achieving successful purification. This study not only provides a simple and rapid method for the purification of PbI 2 but also enhances our understanding of the selective crystallization of PbI 2 and perovskite by elucidating the solvate and de-solvation processes of PbI 2 within the perovskite precursor.
研究领域:
材料科学
·
化学工程
·
可再生能源
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产品关联
DOI
高影响因子
Energies
·
2025
·Vol. 18
·期 9
·2162
·
IF 3.2
Yufan Jiang,Dongdong Deng,Jingjing Dong
All-inorganic CsPbX3perovskites have significant potential for applications in the photovoltaic field. However, during their preparation, the slow evaporation rate of the precursor solution limits the extent of solution supersaturation, leading to porous perovskite films that substantially impair device performance. Anti-solvent engineering, which introduces a secondary solvent to modulate the crystallization process, is a well established technique in perovskite photovoltaic research. This study systematically examines the effects of four different anti-solvents on perovskite films and corresponding devices. It also investigates the optimal dipping-time of (trifluoromethyl)benzene as an anti-solvent, as well as the impact of varying amounts of anti-solvent additive perfluorinated acid. The optimized devices achieved a maximum power conversion efficiency of 12.68%.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyue Liu,Zhiyong Liu,Xianhua Tan,Haibo Ye,Bo Sun,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
All-inorganic CsPbBr 3 is attracting tremendous attentions in photovoltaic field due to its superior stability. However, CsPbBr 3 perovskite always suffers from a poor crystallinity and film morphology. Many efforts have been paid on the CsBr deposition process to improve the film quality, while few attentions are paid on the crystallization kinetics of the PbBr 2 framework film. Here, we demonstrate a novel antisolvent-washing strategy for the PbBr 2 film for the first time to fabricate high-quality CsPbBr 3 film. This technique has a significant impact on the nucleation and growth of PbBr 2 crystals. As-prepared CsPbBr 3 films exhibit more homogeneous with higher crystallinity and coverage as well as larger grain sizes compared to those untreated ones. The best-performing antisolvent-treated perovskite solar cell achieves a scanned power conversion efficiency of 8.55%, which is an excellent efficiency for planar CsPbBr 3 cells reported yet. This enhancement can be mainly attributed to the more effective charge transport and suppressed non-radiative recombination caused by the reduced defect densities . Moreover, our devices show superb stability when stored in air for 1000 h and upon persistent thermal attack at 80 °C. Our work provides a new train of thought for controlling the growth dynamics and film morphology of CsPbBr 3 films.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
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产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Chong Dong,Jing Chen,Chun-Hao Chen,Yi-Ran Shi,Wen-Fan Yang,Kai-Li Wang,Zhao-Kui Wang,Liang-Sheng Liao
To promote the commercialization of perovskite photovoltaics , the development of annealing-free techniques is one of effective strategies to lowering the whole manufacture cost. Unfortunately, annealing-free perovskite films are always accompanying with unsatisfactory crystallization, which would cause defect generation and adverse carrier nonradiative recombination. Herein, we chose triple-cation perovskite and introduce 3,4-ethoxylene dioxy thiophene (EDOT) into anti-slvent to realize annealing-free perovskite films. EDOT-assisted anti-solvent strategy aids to form high quality perovskite films with enlarged crystal grains and reduced defects via the interaction between oxygen and lead. The fabricated flexible and rigid solar cells delivered the power conversion efficiency of 15.58% and 20.12%, respectively, under AM 1.5 G illumination. The flexible and rigid devices also exhibited excellent indoor (@1000 lux) performance of 22.79% and 32.61%, respectively. The developed anti-solvent engineering provides a facial and effective strategy to fabricate low-cost flexible perovskite photovoltaics for indoor and outdoor applications.
研究领域:
材料科学
·
光伏技术
·
能源工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Daoping Ye,Wenxiang Tang,Tao Zhang,Li Lv,Zongpeng Zou,Raju Kumar Gupta,Shengwei Tang
CO 2 hydrogenation to olefines is a feasible carbon capture and utilization (CCU) route. The process includes sequential reactions of reverse water gas shift (RWGS) reaction and Fischer-Tropsch synthesis (FTS) reaction. The acceleration of FTS is crucial to improve the olefines yield. A microemulsion anti-solvent extraction (MAE) method was proposed to prepare Fe-based catalyst on the support of Al 2 O 3 . Ethanol solution of Fe(NO 3 ) 3 was encapsulated in microdroplets, and then loaded on Al 2 O 3 by the extraction of ethanol from the microdroplets to isooctane phase. The average size of micro droplets was 7.5 nm. After calcination , the particle size of Fe 2 O 3 was 6 nm. After carburization with CO, the interface formed between Fe 3 O 4 and Fe 5 C 2 was restricted in a narrow space with a mean size of 12 nm. Through TEM-Mapping, XRD , XPS and TPC characterization, the distribution uniformity of Fe and the neighboring degree of Fe 3 O 4 and Fe 5 C 2 on the as-prepared catalyst MAE-Fe 1 K 1 was improved effectively. An enhanced synergistic effect between Fe 3 O 4 and Fe 5 C 2 was obtained. The catalytic performance evaluation results showed that yield of C 2 -C 4 olefins reached 0.063 mmol·gFe −1 ·s −1 after 12 h of reaction. It exhibited better catalytic performance than most catalysts reported in the literatures. The results showed that the proposed microemulsion anti-solvent extraction strategy is an effective method to prepare Fe-based catalyst for CO 2 -FTO reaction with an excellent catalytic performance.
研究领域:
催化化学
·
材料科学
·
环境科学
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DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Azhar Ali Ayaz Pirzado,Chaoqiang Wang,Xiujuan Zhang,Shuai Chen,Ruofei Jia,Huanyu Zhang,Jinwen Wang,Tehinke Achille Malo,Jie Lin,Geng He,Erdi Akman,Jingsong Huang,Jiansheng Jie
Organic-inorganic halide perovskite single crystals (OIHP-SCs) are promising light-emitting materials for bright electroluminescence (EL) devices due to their superior optoelectronic properties and excellent stability. However, the conventional high-temperature growth methods will inevitably disturb the ordered growth and introduce massive defects in OIHP-SCs, leading to the degradation of device performance. The preparation of thin OIHP-SCs with low trap-state densities for high-performance EL devices remains a formidable challenge. Here, we develop an efficient antisolvent-assisted confined growth (AACG) method for the room-temperature growth of formamidinium lead bromide (FAPbBr 3 ) perovskite SCs. An antisolvent vapour environment is intentionally introduced in the spatially confined growth process to lower the free energy barrier for nucleation, enabling the growth of high-quality FAPbBr 3 SCs at room temperature. Consequently, FAPbBr 3 SCs with ultralow trap-state density of 2.15 × 10 9 cm −3 and amplified spontaneous emission (ASE) threshold of 7.1 µJ cm −2 could be achieved, representing the best results ever reported for FAPbBr 3 SCs. By leveraging the high crystal quality of FAPbBr 3 SCs, SC-based perovskite light-emitting diodes (PeLEDs) with a high luminance of over 26,000 cd m −2 and a peak current efficiency (CE) of 13.02 cd A −1 are demonstrated. Our work opens up new opportunities for the development of high-performance EL devices based on OIHP-SCs.
研究领域:
材料科学
·
光电技术
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产品关联
DOI
高影响因子
IEEE Journal of Photovoltaics
·
2021
·Vol. 12
·期 1
·322-326
·
IF 3.887
Tianjie Fan,Wenzhan Xu,Yu Gao,Rongguo Xu,Feiyu Kang,Guodan Wei
One-step spin-coating solution deposition was reported as an excellent processing method in perovskite solar cells (PSCs). Antisolvent treatment has been demonstrated to significantly enhance the power conversion efficiency (PCE) of PSCs owing to the formation of high-quality perovskite crystals and passivation of defects. In this article, we alter different antisolvents in solution deposition process, i.e., chlorobenzene, toluene, and diethyl ether, combined with different measurements of scanning electron microscopy, atomic force microscopy, X-ray diffraction, time-resolved photoluminescence, and UV–vis absorption spectrum (UV–vis) to investigate the evolution of perovskite thin films. These results illustrate that a smooth and compact perovskite layer by antisolvent treatment is beneficial to enhancing device performance. A high coverage, large crystal size and smooth Cs
0.15
FA
0.85
PbI
3
thin film with a long carrier lifetime attained via antisolvent treatment is utilized to fabricate an inverted planar heterojunction solar cell, which exhibits PCE more than 15%.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 35
·354004
·
IF 3.409
Chun-Liang Zhou,Wen-Bo Ma,Zhen-Long Zhang,Yan-Li Mao
The anti-solvent method is one of the main methods used to prepare two-dimensional (2D) Ruddlesden–Popper (RP)-phase perovskite (PVK) films. To investigate the effect of anti-solvent type on the performance of solar cells based on RP-phase PVK films, three kinds of solvents, toluene (TL), ethyl acetate (EA) and chlorobenzene (CB), were used to prepare 2D RP-phase PVK of GA2MA4Pb5I16. The results display that solar cells based on a 2D PVK layer formed with CB present better performance than those with TL and EA. The results of several investigations show that PVK films formed with CB present lower trap density, longer lifetime, no pinholes and smoother surfaces compared with those formed with TL and EA. This demonstrates that CB is the optimal anti-solvent for the preparation of 2D RP PVK solar cells.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Zhixin Zhang,Xinshu Luo,Jie Ding,Jingbo Zhang
Methylamine lead iodide (CH 3 NH 3 PbI 3 ) perovskite thin film solar cell has attracted much attention due to its low cost and high photoelectric conversion efficiency. Preparation of high quality perovskite thin film is the key to obtain high conversion efficiency of solar cells. Here, the pinhole-free CH 3 NH 3 PbI 3 layer with high coverage and smooth surface is prepared by the one-step solution method in air with ethylacetate as anti-solvent on an electron transport hybrid layer of TiO 2 nanoparticles coated porous carbon . The effect of ethylacetate as anti-solvent on the quality of perovskite thin film is studied in detail by comparing with chlorobenzene and ethylether. The high saturation and humidity resistance of ethylacetate in air control the nucleation and growing kinetics of perovskite crystals during the spin coating process, which facilitates the formation of uniform pinhole-free perovskite thin films. The perovskite solar cell based on the prepared high quality thin film achieves the highest conversion efficiency of 17.41% in ambient air with a relative humidity of 35%, which is superior to the perovskite thin films prepared with chlorobenzene and ethylether (conversion efficiency of 10.80% and 10.20%). The higher light-to-electric conversion efficiency is due to high coverage of the pinhole-free perovskite thin film and good contact with the electron transport layer and the hole transport layer.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yuqian Huang,Shaohang Wu,Rui Chen,Shaoying Fang,Shasha Zhang,Gang Wang,Wei Chen
Antisolvent and additive strategies are significantly positive to improve the crystal quality, device performance, and long-term stability of perovskite solar cells (PSCs). In addition, the high-quality perovskite thin films could be prepared by the methylamine (MA) gas-induced defect-healing process. However, until now, the research on adding MA into the antisolvent, which may take the advantages of two efficiently modified strategies, is still not systematically studied. Here, we add the MA additive into the chlorobenzene antisolvent to fabricate the FA0.85Cs0.15Pb(Br0.15I2.85) films and achieve the high-quality light-absorbing layers with the preferred orientation of (101). The use of an antisolvent, with an appropriate amount of MA in chlorobenzene, leads to extremely uniform and dense perovskite layers with a better hydrophobic performance and enables the fabrication of remarkably improved solar cells with a power conversion efficiency (PCE) of 19.6% for a champion cell. This strategy shows an encouraging improvement of more than 13.95% compared with the traditional antisolvent strategy. The high-efficiency devices could maintain more than 95 or 88% of their initial PCEs after 500 h under continuous light soaking or thermal aging in the dark at 85 °C in a N2-filled glove box, respectively. These results provide an important progress in the realization of highly efficient and stable PSCs.
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
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 45
·14188-14197
·
IF 6.641
Xiaohua Cheng,Ye Yuan,Lin Jing,Tianliang Zhou,Zhengxiao Li,Zhiwei Peng,Qing Yao,Jie Zhang,Jianxu Ding
There has been great interest in the use of cesium lead bromide (CsPbBr3), which is one of the most important members of the all-inorganic perovskite family, due to its superior optoelectronic performance and higher stability. Recently, it has been demonstrated that it is advantageous to use CsPbBr3 microrods and nanowires in photodetectors because of their higher crystallinity, low amount of defects, and easy control of carrier transport along a specific direction as compared to their counterparts of single crystals and thin films. However, there is a shortage of adequate investigations that describe how to control the growth of CsPbBr3 microrods and nanowires so that they retain the optoelectronic performance of single CsPbBr3 microrods. Therefore, we are reporting how to control the growth of orientated dispersive super-long CsPbBr3 microrod single crystals (CsPbBr3 MSCs) via a simple anti-solvent method. The crucial factor in controlling the growth of dispersive super-long CsPbBr3 MSCs is the regulation of the rapid nucleation rate and slowing of the growth rate via controlling the diffusion velocity of anti-solvent methanol. We also reveal the growth mechanism of CsPbBr3 MSCs as layer-by-layer growth that originates from the 2D nucleus. The CsPbBr3 MSCs are revealed grew in the direction of [010], with the (101) facet exposed. Moreover, photodetectors based on one CsPbBr3 MSC were fabricated, and the detectivity (D) and the on/off ratio were as high as 3.67 × 1012 Jones and 988, respectively, suggesting a very strong optoelectronic response as photodetectors. The mechanism that the Cs ions and Cs vacancies use to move to negative and positive electrodes along the channels constructed by [PbBr6]4− in the [010] direction of the CsPbBr3 MSC (101) facet was revealed, after activation by the applied electrical field, which is beneficial to enhance the optoelectronic response but does not reduce the device stability.
研究领域:
材料科学
·
光电材料
·
纳米技术
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产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 37
·e202202793
·
IF 2.307
Chang Liu,Zhuang Liu,Jianlin Chen,Qiaoqiao Tian,Lin Wu,Zhuoyin Peng,Jian Chen
Graphical CsPbBr 3 films with high crystallinity, few grain boundaries and good coverage are prepared via antisolvent assisted crystallization by multi-step spin-coating. The power conversion efficiency (PCE) of devices based on antisolvent treated CsPbBr 3 films reaches 6.5 % whereas the devices without the antisolvent treatment exhibit maximum PCE of 4.97 %. All-inorganic CsPbBr 3 perovskite solar cells (PSCs) are expected to form semitransparent or top-cell of tandem solar cells with Cu(In,Ga)Se 2 or crystalline silicon solar cells owing to their outstanding environmental tolerance and wide bandgap. However, the commonly solution-processed CsPbBr 3 perovskite films usually suffer from inferior film quality. Herein, we propose antisolvent assisted crystallization method to prepare CsPbBr 3 films by multi-step spin-coating process. During the spin-coating step, the underlying PbBr 2 layer is treated with anisole antisolvent in different amount of 0, 50, 100, 150, and 200 μl, respectively, and heated at 80 °C for 30 min. Thus, CsPbBr 3 films with high crystallinity, less grain boundaries and good coverage are prepared. The champion power conversion efficiency (PCE) of devices based on antisolvent treatment reaches 6.5 %, compared to that of devices without antisolvent treatment (PCE 4.97 %). Moreover, the devices treated with antisolvent without encapsulation exhibit good stability under ambient conditions. The antisolvent assisted crystallization provides an effective route for improving the quality of CsPbBr 3 films and promotes the commercialization of all-inorganic CsPbBr 3 PSCs.
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
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