PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2022
·Vol. 24
·期 12
·7451-7457
·
IF 3.945
Yifan Liu,Fei Zheng,Longlong Zhang,Weihua Ren,Zetong Sunli,Yufei Ma,Yuying Hao
Perovskite quantum dots (PQDs) are promising interface modification materials for perovskite solar cells (PSCs). However, due to the limitation of the preparation method, it is hard to use PQDs as substrates for the growth of perovskite films by the common solution process. In this work, by introducing the rare earth element Ce into PQDs with the vacuum freezing and drying technology, we have successfully improved the solvent stability of PQDs. Moreover, we propose a technology, PQD dynamically mediated growth of perovskite film (PDMG), to prepare high-quality perovskite films, which can avoid the formation of PQD charge-blocking layers. Thanks to the improvement of perovskite crystallinity and the charge transport ability, the PCE is improved from 10.44% to 12.14% for CsPbI2Br PSCs and from 14.43% to 16.38% for CsPbI3 PSCs. Our work opens an avenue for using PQDs as substrates in the fabrication of highly efficient PSCs.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yingdi Dong,Lingyu Rao,Yong Zeng,Tao Peng,Jiahao Huang,Yanxiu Wang,Yuping Fan,Zhiyong Gao,Honghu Tang,Wei Sun
The solid–liquid separation of coal tailings is crucial for enhancing coal resource utilization and water circulation. With the mining and processing of low-quality coal, the coal flotation tailings (CFT), characterized by fine particle size, variable mineral composition and complex particle surface properties, presented significant challenges to efficient solid–liquid separation. This study synthesized a series of polycarboxylate ether (PCE) reagents with tunable structure to optimize solid–liquid separation performance and investigate their interaction mechanisms with CFT. The results showed that increasing the carboxyl acid ratio in PCE significantly improved settling and filtration performance. Increasing the carboxyl acid ratio in PCE from 2:1 to 6:1 improved settling rate by 6.5 times and sediment solid content by 9.13 wt%, while reducing specific filtration resistance by 42.86% and filter cake moisture by 3.14%. Analysis of particle surface electrical property and wettability indicated that an increase in the carboxyl acid ratio in PCE enhanced its ability to neutralize the negative charges on the particle surface and its hydrophobic ability. The growth behavior and properties of flocs were investigated by means of focused beam reflectance measurement microscopic observation and fractal dimension analysis. The results showed that an increase in carboxyl acid ratio in PCE promoted floc growth, regrowth, and shear resistance. The floc size increased by 10.48%, and the fractal dimension increased from 1.532 to 1.636, resulting in the formation of flocs with a denser structure. These improvements in floc properties were closely related to the enhancement of CFT settling and dewatering performance. This study provided new insights into the mechanisms of PCE in enhancing solid–liquid separation of coal tailings and highlighted its potential for treating complex tailings.
研究领域:
化学工程
·
矿物加工
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2025
·Vol. 9
·期 12
·e01317
·
IF 9.1
De'en Guo,Yi Yang,Qingrui Cai,Bingchen He,Xingyu Gao,Heng Peng,Junhao Xue,Conghua Zhou
Carbon- electrode (CE) based, hole-conductor-free mesoscopic perovskite solar cells (meso-CPSCs) offer the merits of high stability and low cost, but they contain a large number of nanosized perovskite (PVSK) crystallites in the CE region. These crystallites contribute little to light absorption, but bring risks of charge recombination. Herein, a three-step holistic treatment is introduced to address this issue, such as treatment-1 (T1): partial CE peeling; treatment-2 (T2): octylammonium iodide modification; and treatment-3 (T3): coating of a secondary layer of CE. Low-temperature meso-CPSCs are chosen as the model platform to perform the strategy. It is observed that the strategy removes the redundant PVSK crystallites, induces the formation of tilt-stacked two-dimensional (2D) PVSK, and strengthens interfacial contact of PVSK/CE, which reduces the recombination risks and facilitates interfacial charge-extraction, and finally elevates the power conversion efficiency (PCE) of the low-temperature meso-CPSCs from 14.25(±0.69)% to 16.05(±0.40)%(optimized to 17.28%). The efficiency is further upgraded to 18.07% after additional optimization on internal resistance and substrate transparency. Such performance achieves an increment of ≈50% when comparing to the efficiency of ≈12% that was firstly reported in 2020. In more, the T 80 lifetime of ≈525 h has been obtained during the quasi-maximum power point tracking test in open air (device unsealed).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 17
·2207312
·
IF 13.3
Jie Fu,Jun Liu,Lin Yuan,Qi Pan,Shuhua Chen,Yiqi Hu,Jinxing Chen,Wanli Ma,Qiao Zhang,Zeke Liu,Muhan Cao
All-inorganic lead halide perovskite nanocrystals (NCs) emerge as a rising star in photovoltaic fields on account of their excellent optoelectronic properties. However, it still remains challenging to further promote photovoltaic efficiency due to the susceptible surface and inevitable vacancies. Here, this work reports a 3D/2D core/shell perovskite heterojunction based on CsPbI 3 NCs and its performance in solar cells. The guanidinium (GA + ) rich 2D nanoshells can significantly passivate surface trap states and lower the capping ligand density, resulting in improved photoelectric properties and carrier transport and diminished nonradiative recombination centers via the hydrogen bonds from amino groups in GA + ions. Consequently, an outstanding power conversion efficiency (PCE) of up to 15.53% is realized, substantially higher than the control device (13.77%). This work highlights the importance of surface chemistry and offers a feasible avenue to achieve high-performance perovskite NCs-based optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Shengxing Zhou,Wenhao Chen,Weiqing Liu,Jiale Cao,Ligang Yuan
The utilization of binder-free TiO 2 paste allows for the dye-sensitized solar cells (DSSCs) TiO 2 electrode fabrication at low temperatures, thus making it a potential material for flexible solar cell devices. However, the physical robustness of formed electrodes using TiO 2 paste at low temperatures remains challenging, including issues such as cracking due to film stress and challenges in adjusting the viscosity of the TiO 2 paste. In this study, we enhanced the binder-free TiO 2 paste performance by incorporating sodium dodecylbenzene sulfonate (SDBS) as an additive for TiO 2 electrode precursor solution. It demonstrated that SDBS additives help to relieve internal stress and ultimately enhance the physical and structural characteristics of the films by improving the viscosity in the TiO 2 paste and promoting the dispersed pinholes within the TiO 2 films. Furthermore, implementing TiO 2 paste with varying ratios of SDBS has enabled the fabrication of DSSCs with the highest achieved power conversion efficiency (PCE) of 4.53%, representing an enhancement of nearly 15% compared to TiO 2 paste without SDBS. This research presents a practical and effective approach for preparing highly efficient binder-free TiO 2 paste.
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
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Xian Hou,Tongtong Xuan,Hengchao Sun,Xiaohong Chen,Huili Li,Likun Pan
ZnGa 2 O 4 :Eu 3+ nanophosphor was synthesized through a hydrothermal method and used as an effective light down-shifting/converting material in mesoporous TiO 2 layer of perovskite solar cells (PSCs). The nanophosphor can convert the high energy incident photon into the photon(s) with lower energy, which can excite CH 3 NH 3 PbI 3 to generate more photo generated electron–hole pairs, and thus promote the incident light use ratio and increase the power conversion efficiency (PCE) of PSCs. After the incorporation of suitable amount of ZnGa 2 O 4 :Eu 3+ into PSCs, the cell PCE is increased to 13.80% with a photocurrent density of 23.68 mA cm − 2 and a highest PCE of 14.34% with a photocurrent density of 25.02 mA cm −2 is achieved, much higher than those of the cell without ZnGa 2 O 4 :Eu 3+ (PCE of 10.67% and photocurrent density of 20.2 mA cm −2 ). The enhanced photovoltaic performance by incorporating the nanophosphor into PSCs should be ascribed to the increased incident light use ratio and improved exciton generation rate.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Guixiang Xie,Qilong Li,Xiaochun Lu,Longtao Li
Organic–inorganic hybrid perovskite solar cells (PSCs) have shown impressive photoelectric conversion efficiency (PCE) but suffer from inevitable degradation when exposed to air and light. Replacing the organic cations with inorganic Cs+ to yield all-inorganic CsPbX3 perovskites can improve the stability under environmental pressure. Among them, cesium lead bromide (CsPbBr3) perovskite shows great environmental tolerance under illumination, humidity, heat, and oxygen attack. However, the energy gap between the carbon electrode and CsPbBr3 limits the carrier separation–transfer rate. Herein, p-type charge-transfer-doped NiO nanocrystals are employed as hole transport materials in all-inorganic CsPbBr3 PSCs with a fluorine-doped tin oxide (FTO)/SnO2/CsPbBr3/NiO-l-Cys/carbon structure. This combination reduces the charge-carrier recombination by decreasing the hole transport potential energy-level barrier between the perovskite and the hole transport layer. The coordination of the energy structure associated with the interfacial charge extraction–transfer action leads to a remarkable enhancement in PCE (9.61%) and a much higher open-circuit voltage (1.614 V), surpassing those achieved by hole-free devices (7.35% and 1.504 V, respectively). The PSC device assembled with NiO nanocrystals displays good stability under high humidity and temperature for 30 days. The greatly improved PCE, coupled with good stability, demonstrates the great potential of l-cysteine-doped NiO for future use as a hole-transporting material in all-inorganic 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
Sustainable Energy & Fuels
·
2017
·Vol. 2
·期 2
·436-443
·
IF 0
Jiaxu Yao,Liyan Yang,Feilong Cai,Yu Yan,Robert S. Gurney,Dan Liu,Tao Wang
We have fabricated planar heterojunction perovskite solar cells by one-step ultrasonic spray-coating of the perovskite precursor solution in air. Uniform perovskite films with high surface coverage can be prepared after optimization of the precursor solution and spray-coating parameters. We found that the purity of PbI2, although varying only from 98 to 99.9%, can significantly affect the crystallinity, grain size and boundaries of MAPbI3 films that were fabricated via one-step spray-coating, and ultimately determined the power conversion efficiency (PCE) of perovskite devices. PbI2 with a purity of 98% resulted in a low conversion of precursors to perovskites, whilst a high purity of 99.9% led to perovskites with a high crystallinity, large grain size and narrow grain boundaries. Our p–i–n type, planar heterojunction solar cell ITO/PEDOT:PSS/MAPbI3/PCBM/Ag made from MAI and 99.9% purity PbI2 achieved a maximum PCE of 12.6% without hysteresis, whereas the 98% purity PbI2-based device showed a low PCE of only 4.9% with the presence of hysteresis. However, the impacts of PbI2 purity on the device efficiency can be minimized by changing the deposition method from one-step spray-coating to a two-step spin casting approach.
研究领域:
材料科学
·
太阳能
·
光伏技术
·
纳米技术
✓ 已验证
DOI
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 12
·2210223
·
IF 29.4
Jungang Wang,Yuhang Che,Yuwei Duan,Zhike Liu,Shaomin Yang,Dongfang Xu,Zhimin Fang,Xuruo Lei,Yong Li,Shengzhong (Frank) Liu
Cesium lead triiodide (CsPbI 3 ) is a promising light-absorbing material for constructing perovskite solar cells (PSCs) owing to its favorable bandgap and thermal tolerance. However, the high density of defects in the CsPbI 3 film not only act as recombination centers, but also facilitate ion migration, leading to lower PCE and inferior stability compared with the state-of-the-art organic–inorganic hybrid PSC counterpart. Theoretical analyses suggest that the effective suppression of defects in CsPbI 3 film is helpful for improving the device performance. Herein, the stable and efficient γ -CsPbI 3 PSCs are demonstrated by developing an acyloin ligand (1,2-di(thiophen-2-yl)ethane-1,2-dione (DED)) as a phase stabilizer and defect passivator. The experiment and calculation results confirm that carbonyl and thienyl in DED can synergistically interact with CsPbI 3 by forming a chelate to effectively passivate Pb-related defects and further suppress ion migration. Consequently, DED-treated CsPbI 3 PSCs yield a champion PCE of 21.15%, which is one of the highest PCE among all the reported CsPbI 3 PSCs to date. In addition, the unencapsulated DED-CsPbI 3 PSC can retain 94.9% of itsinitial PCE when stored under ambient conditions for 1000 h and 92.8% of its initial PCE under constant illumination for 250 h.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 23
·2204335
·
IF 27.8
Ziwei Zheng,Minghao Xia,Xiayan Chen,Xuan Xiao,Jinwei Gong,Jiale Liu,Jiankang Du,Yiran Tao,Yue Hu,Anyi Mei,Xinhui Lu,Hongwei Han
The low cost and scalability advantages of printable mesoscopic perovskite solar cells (p-MPSCs) are impaired by the issue of limited power conversion efficiency (PCE). Herein, the PCE of p-MPSCs is improved by introducing the polymer additive polyacrylonitrile (PAN) into the formamidinium (FA)-based perovskite for crystallization and defect modulation. PAN forms hydrogen bond and coordination bond with halide perovskite through its C≡N group. Such interactions improve the crystallization and filling of FA-based perovskite in the mesoscopic scaffold and bring a long carrier lifetime by passivating defects. The synergy improves the PCE of p-MPSCs from 16.80% to 18.33%. Meanwhile, the hydrophobic nature of PAN enhances the device's resistance against moisture. This work demonstrates that the polymer additive is a promising choice for breaking the PCE limit of p-MPSCs.
研究领域:
材料科学
·
太阳能
·
化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Yongchi Zhou,Tian Xu,Meifeng Xu,Yaoyao Yin,Yu Wang,Yonglong Jin,Chaonan Wang
In this work, Raman signals are used to characterize the crystallinity of perovskite films and the photoelectric conversion efficiency (PCE) of perovskite solar cells . By controlling the ratios of EtOH and CHCl 3 during the perovskite crystallization process , the CH 3 NH 3 PbI 3 film with larger crystal grain size , higher crystallinity and no pinholes can be obtained. Good crystallinity of perovskite films promotes charge transfer (CT), and Raman spectroscopy is a practical method for the real time detection of CT in perovskite films. The results manifest that SERS intensities are conforming to X-ray diffraction (XRD) intensities and the PCE of perovskite solar cells . Meanwhile, the Raman signals are tested in the nitrogen environment, which can avoid the decomposition of perovskite films caused by H 2 O and O 2 . These results indicate that this method provides an early, real-time and harmless method to study the performance of perovskite photovoltaic devices .
研究领域:
材料科学
·
光子学
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Huan Bi,Yao Guo,Mengna Guo,Chao Ding,Shuzi Hayase,Hanjun Zou,Qing Shen,Gaoyi Han,Wenjing Hou
Although perovskite solar cells (PSCs) have achieved significant success, there are still some barriers to their commercialization , such as poor stability and unsatisfactory power conversion efficiency (PCE). Here, we report low-dimensionality engineering of perovskites using mercaptoethylammonium iodide (MEMI). Two-dimensional (2D) perovskite materials can simultaneously passivate the interface defects of the perovskite film and enhance carrier extraction. The PCE of the device increased from 20.85% for the control device to a resultant of 22.41% for the target device. Meanwhile, device stability was ameliorated after MEMI modification, and the stability of unencapsulated target devices decreased by 7.5% after aging in the dark air condition for 300 h. Finally, the notorious lead leakage was significantly suppressed. This work guides to create efficient and stable environmentally friendly PSCs through low-dimensional engineering.
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
危险品化学品经营许可证（带存储）