ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhibo Zhu,Chengyang Wang,Jiawen Li,Jie He,Mei Lyu,Jun Zhu
CsPbI3 quantum dots have been employed in solar cells, owing to their exceptional photovoltaic properties. However, the ligand exchange process occurring on the surface of these quantum dots is susceptible to environmental water and oxygen, resulting in phase transitions or even aggregation, ultimately degrading the solar cell performance. The application of a quaternary ammonium salt, specifically phenyltrimethylammonium iodide, possessing strong electron-withdrawing groups for the post-treatment of quantum dot films serves dual purposes: it not only occupies the A and X-site vacancies on the quantum dot surface generated by the desorption of oleic acid and oleylamine during the ligand exchange process but also forms a protective capping layer on the surface. This capping layer isolates the quantum dots from water and oxygen, thereby enhancing the film quality. Consequently, the power conversion efficiency of the control device, 9.29%, increases to 11.59% for the target solar cell with phenyltrimethylammonium iodide treatment. Moreover, the target solar cell remains above 93% of its initial efficiency value after a storage at 25–35% relative humidity and 35–40 °C in air for 14 days.
研究领域:
光伏技术
·
纳米技术
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材料科学
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Siguang Li,Minghua Li,Yiyang Wang,Xin Jiang,Zhe Liu,Yufei Gong,Meng Yuan,Tianwei Zou,Ruihan Wu,Siyu Zhuang,Senyao Wang,Shucheng Qin,Lei Meng,Yongfang Li
The inverted inorganic CsPbI3 perovskite solar cells (pero-SCs) show lower efficiency compared to the organic–inorganic hybrid pero-SCs, mainly due to its wide bandgap and poor fill factor (FF). Here, by doping a multifunctional additive, 4-(1,3,5-Triaza-7-phosphaadamantan-1-ium-1-yl)butane-1-sulfonate (PTABS), the compact perovskite film forms and grows into large grains during thermal annealing through the ripening process. Moreover, the evaporation of DMAI is accelerated owing to the hydrogen bond formed between DMAI and PTABS, which limits the invasion of moisture during annealing. After the evaporation of DMAI, the remaining PTABS coordinates with the Pb2+ ions and reduces the defects. Consequently, a high FF of 86.17% is reached, and the power conversion efficiency of the inverted CsPbI3 pero-SCs is improved to 22.09%. The stability is also improved, owing to the decreasing defects. This work emphasizes the significance of controlling the crystallization process in improving the efficiency of inorganic CsPbI3 pero-SCs.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
固体物理
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 9
·期 3
·2001684
·
IF 8.286
Kun-Hua Wang,Li Wang,Yu-Ying Liu,Yong-Hui Song,Yi-Chen Yin,Ji-Song Yao,Jun-Nan Yang,Jing-Jing Wang,Li-Zhe Feng,Qian Zhang,Qun Zhang,Hong-Bin Yao
All-inorganic CsPbX 3 (X = Cl, Br, or I) perovskite thin films are attractive emissive layers for high-performance light-emitting diodes (LEDs) due to their precisely tunable bandgaps, excellent color purities, good stabilities, and solution processabilities. However, the fabrication of high-quality CsPbI 3− x Br x thin films is very challenging because the crystal growth of mixed halide CsPbI 3− x Br x is in low controllability. Herein, a synergetic regulation strategy using fluorine polymer (Poly(vinylidene fluoride-co-hexafluoropropylene)) and a small amino acid molecule (L-Arginine) is developed to fabricate high-quality CsPbI 3− x Br x thin films for efficient pure red perovskite LEDs. In the fabricated CsPbI 3− x Br x thin film, the fluorine polymer plays a crucial role in confining CsPbI 3− x Br x crystal size at the nanoscale and the small amino acid molecule acts as a passivation agent to reduce the trap-state density. Under this synergetic effect, a uniform CsPbI 3− x Br x thin film with a high photoluminescence quantum yield up to 40% can be obtained to fabricate an efficient pure red perovskite LED with a maximum external quantum efficiency of 4.5% and a maximum brightness of 3100 cd m −2 . The reported synergistic regulation strategy will open a new avenue to fabricate efficient pure color CsPbX 3 perovskite LEDs.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
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
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yuefeng Gao,Sai Xu,Zhijian Liu,Kezhen Yu,Chengfa Wang,Sen Wu,Junsheng Wang,Xinxiang Pan
Cu 2+ content in diesel engine lubricating oil refers to a vital parameter suggesting the quality of oil and judging mechanical wear . Accordingly, the on-site rapid copper ions content determination in lubricant is of great significance to safe operation of diesel engines. However, most of the current researches on detection are carried out in laboratory, requiring the use of large-scale equipment such as spectrometer, which are not suitable for rapid on-site detection. Quantum dot-based optical microfluidic chip provides the possibility for heavy metal ions on-site detection, but it is subject to the defect of weak fluorescence intensity , thereby the increase in sensitivity is limited. In the present study, a microfluidic sensor using SiO 2 inverse opal photonic crystals (IOPCs) to heighten CsPbI 3 perovskite quantum dots (PQDs) photoluminescence (PL) intensity is proposed, which can realize rapid Cu 2+ content detection in lubricant. Firstly, the selective detection characteristic of CsPbI 3 on Cu 2+ was studied. Experimental results showed that the photoluminescence of CsPbI 3 was significantly quenched by Cu 2+ because electrons were effectively transferred from CsPbI 3 to Cu 2+ . Subsequently, to enhance the fluorescence intensity of CsPbI 3 probe, the SiO 2 IOPCs structure was formed in chip detection well. The effective PL intensity of CsPbI 3 PQDs was enhanced by the photonic stopband effect formed by the periodically arranged micro-nano structure of photonic crystals . This enhancement effect was attributed to the coupling effect between stopband with excitation and emission light. As the stopband of SiO 2 IOPCs was coupled with the excitation light wavelength and emission light wavelength of CsPbI 3 , the enhancement factors could reach 17-fold and 22-fold, respectively. The mentioned strategy could effectively improve the detection sensitivity of the microfluidic sensor and reduce the detection limit to 0.34 nM. Moreover, the formed microfluidic sensor system can be used for determination of Cu 2+ content in lubricating oil on site. Meanwhile, the sturdy porous structure of SiO 2 IOPCs also facilitated target metal ions to be captured and enriched.
研究领域:
材料科学
·
分析化学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 45
·2205028
·
IF 32.086
Yuqi Cui,Jiangjian Shi,Fanqi Meng,Bingcheng Yu,Shan Tan,Shan He,Chengyu Tan,Yiming Li,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
All-inorganic CsPbI 3 perovskite has emerged as an important photovoltaic material due to its high thermal stability and suitable bandgap for tandem devices. Currently, the cell performance of CsPbI 3 solar cells is mainly subject to a large open-circuit voltage ( V OC ) deficit. Herein, a multifunctional room-temperature molten salt, dimethylamine acetate (DMAAc) is demonstrated, which not only directly acts as a solvent for precursor solutions, but also regulates the phase conversion process of the CsPbI 3 film for high-efficiency photovoltaics. DMAAc can stabilize the DMAPbI 3 structure and eliminate the Cs 4 PbI 6 intermediate phase, which is easily spatially segregated. Meanwhile, a new homogeneous intermediate phase DMAPb(I,Ac) 3 is formed, which finally affords high-quality CsPbI 3 films. With this approach, the charge capture activity of defects in the CsPbI 3 film is significantly suppressed. Consequently, a V OC of 1.25 V and >21% power conversion efficiency are achieved, which is the record highest reported thus far. This intermediate phase-regulation strategy is believed to be applicable to other perovskite material systems.
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
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 28
·2301879
·
IF 29.4
Shan Tan,Chengyu Tan,Yuqi Cui,Bingcheng Yu,Yiming Li,Huijue Wu,Jiangjian Shi,Yanhong Luo,Dongmei Li,Qingbo Meng
Severe nonradiative recombination originating from interfacial defects together with the pervasive energy level mismatch at the interface remarkably limits the performance of CsPbI 3 perovskite solar cells (PSCs). These issues need to be addressed urgently for high-performance cells and their applications. Herein, an interfacial gradient heterostructure based on low-temperature post-treatment of quaternary bromide salts for efficient CsPbI 3 PSCs with an impressive efficiency of 21.31% and an extraordinary fill factor of 0.854 is demonstrated. Further investigation reveals that Br − ions diffuse into the perovskite films to heal undercoordinated Pb 2+ and inhibit Pb cluster formation, thus suppressing nonradiative recombination in CsPbI 3 . Meanwhile, a more compatible interfacial energy level alignment resulting from Br − gradient distribution and organic cations surface termination is also achieved, hence promoting charge separation and collection. Consequently, the printed small-size cell with an efficiency of 20.28% and 12 cm 2 printed CsPbI 3 minimodules with a record efficiency of 16.60% are also demonstrated. Moreover, the unencapsulated CsPbI 3 films and devices exhibit superior stability.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2020
·
IF 14.612
Jun-Nan Yang,Yang Song,Ji-Song Yao,Kun-Hua Wang,Jing-Jing Wang,Bai-Sheng Zhu,Ming-Ming Yao,Sami Ur Rahman,Yi-Feng Lan,Feng-Jia Fan,Hong-Bin Yao
All-inorganic lead halide perovskite nanocrystals (NCs) are potential candidates for fabricating high-performance light-emitting diodes (LEDs) owing to their precisely tunable bandgaps, high photoluminescence (PL) efficiency, and excellent color purities. However, the performance of pure red (630–640 nm) all-inorganic perovskite LEDs is still limited by the halide segregation-induced instability of the electroluminescence (EL) of mixed halide CsPbI3-xBrx NCs. Herein, we report an effective approach to improving the EL stability of pure red all-inorganic CsPbI3-xBrx NC-based LEDs via the passivation of potassium bromide on NCs. By adding potassium oleate to the reaction system, we obtained potassium bromide surface-passivated (KBr-passivated) CsPbI3-xBrx NCs with pure red PL emission and a photoluminescence quantum yield (PLQY) exceeding 90%. We determine that most potassium ions present on the surface of NCs bind with bromide ions and thus demonstrate that potassium bromide surface passivation of NCs can both improve the PL stability and inhibit the halide segregation of NCs. Using KBr-passivated CsPbI3-xBrx NCs as an emitting layer, we fabricated stable and pure red perovskite LEDs with emission at 637 nm, showing a maximum brightness of 2671 cd m–2, maximum external quantum efficiency of 3.55%, and good EL stability. The proposed KBr-passivated NC strategy will open a new avenue for fabricating efficient, stable, and tunable pure color perovskite NC LEDs.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Wenji Zhan,Haifei Wang,Jiahao Guo,Yugang Liang,Yanming Wang,Jixin Wu,Zhengzheng Dang,Ni Zhang,Jingjing Cao,Yingping Fan,Yu Zou,Bowei Li,Yao Wang,Yuetian Chen,Yanfeng Miao,Yixin Zhao
Deep-red light-emitting diodes (LEDs) with 690−710 nm emission show high significance in optical, agricultural, and biomedical applications. As primary candidates for deep-red emitters, all-inorganic CsPbI 3 films suffer from fused large grains with abundant trap states, leading to inferior performance of deep-red perovskite LEDs (PeLEDs). Here we report CsPbI 3 nanocrystal films with strong space confinement and notable performance at ∼700 nm of deep-red emission via bulk fabrication. The dual roles of diaza-18-crown-6 dihydriodide additive as crystallization regulator and Lewis base ligand trigger more nucleation sites, retarded grain growth and passivated trap states, ensuring the crystallization of high-quality space-confined CsPbI 3 nanocrystal films. This approach establishes a record-high external quantum efficiency (EQE) of 23.4% for deep-red PeLEDs, and achieves a maximum luminance of 10152 cd m −2 . Low roll-off is also demonstrated that EQE maintain over 20% under a high current density of 900 mA cm −2 , which is superior to state-of-the-art deep-red organic and quantum-dot LEDs. The T 50 operating lifetime is estimated to be 234 h at an initial radiance of 6.3 W sr −1 m −2 . This work provides an effectual strategy to accelerate radiative recombination and enhance the performance of CsPbI 3 -based deep-red PeLEDs.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
钙钛矿发光二极管
✓ 已验证
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 22
·225602
·
IF 3.551
Changsong Chen,Dan Li,Yihua Wu,Cheng Chen,Zhi-Gang Zhu,Wan Y Shih,Wei-Heng Shih
Perovskite nanocrystals are a new type of fluorescent material with the advantages of facile preparation process, bright tunable color with high quantum yield. They are ideal candidates for optoelectronic devices such as light-emitting diode (LED) and display. However, for practical applications of iodine-based perovskite nanocrystals, the photostability remains a great challenge because of their sensitivity to environmental factors such as oxygen, humidity etc. In this paper, we improve the photostability of CsPbI3 by introducing the polymethyl methacrylate (PMMA) as a matrix to form flexible perovskite/PMMA composite films. The composite films maintain good photoluminescence quantum yield for 25 d in air and 4 d in water. Furthermore, these films are flexible and can sustain multiple bending and folding while maintaining their photoluminescence properties. This photostability against mechanical deformation allows for the development of flexible devices. As an example, flexible white light-emitting diodes (WLED) were produced with chromaticity coordination (0.31, 0.32), color temperature 6735 K and good stability over time.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hang Zhong,Wenbo Li,Yin Huang,Duoling Cao,Congqiang Zhang,Huaxi Bao,Zhiguang Guo,Li Wan,Xu Zhang,Xiuhua Zhang,Yuebin Li,Xiaoming Ren,Xianbao Wang,Dominik Eder,Kai Wang,Shengzhong Frank Liu,Shimin Wang
All-inorganic CsPbI3 perovskites have great potential in tandem cells in combination with other photovoltaic devices. However, CsPbI3 perovskite solar cells (PSCs) still face a huge challenge, resulting in a low power conversion efficiency (PCE) relative to organic–inorganic PSCs. In this work, we introduced tetrabutylammonium acetate (TBAAc) as a buffer layer between the SnO2 electron-transport layer (ETL) and CsPbI3 all-inorganic perovskite film interface for the first time. TBAAc not only improved the conductivity of SnO2 ETL but also formed a 1D TBAPbI3 layer between the SnO2 ETL and the 3D CsPbI3 all-inorganic perovskite film, thereby enhancing the stability and passivating the surface defects of the CsPbI3 perovskite to fabricate high-efficiency carbon-counter electrode (CE)-based CsPbI3 solar cells. We fabricated carbon-CE-based hole-transporting layer ( HTL)-free PSCs with an FTO/SnO2/TBAAc/CsPbI3/C structure. The open-circuit voltage (Voc), short circuit current density (Jsc), PCE, and fill factor of the champion CsPbI3 PSCs simultaneously enhanced to 1.08 V, 17.48 mA/cm2, 12.79, and 67.8%, respectively. This PCE is currently one of the high efficiencies reported for the above planar-structured carbon-CE-based CsPbI3 PSCs to date. Moreover, the optimized device exhibits excellent stability, which retained over 83% of its initial PCE after 350 h. This work provides a facile way of simultaneous optimization of the SnO2 ETL and the CsPbI3 perovskite layer to fabricate stable and high-efficiency carbon-CE-based CsPbI3 PSCs.
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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tiantian Wang,Xiansheng Li,Tao Fang,Shalong Wang,Jizhong Song
Cesium lead iodide (CsPbI 3 ) perovskite nanocrystals (NCs) have received widespread attention in light-emitting diodes (LEDs), solar cells, and photodetectors (PDs) for their high thermal stability resulting from all-inorganic components. However, the facile room-temperature synthesis of perovskite-phase CsPbI 3 NCs remains a major challenge because of the thermal unequilibrium-induced metastable (black) to stable (yellow) phase transition. Here, we proposed a ligand-mediated strategy to synthesize γ-phase CsPbI 3 perovskite NCs in non-polar solvent at room temperature for the first time. We found that the introduction of 4-dodecylben-zenesulfonic acid (DBSA) ligand could prevent CsPbI 3 changing from the γ phase to the δ phase, which was attributed to the strong bonding and steric hindrance that suppressed the distortion of the corner-sharing octahedron . The as-synthesized CsPbI 3 perovskite NCs were well-dispersed in organic solvents (such as toluene and hexane), which could serve as inks to construct the active layer for solution-processed optoelectronic devices (The PD with an on/off ratio of 200, and the LED showing an external quantum efficiency (EQE) approaching 6%). The proposed method showed superior universality as evidenced by the successful synthesis of efficient red-greenblue CsPbX 3 NCs (the EQEs were 8.6%, 14.7%, and 3.4% for red, green, and blue LEDs, respectively). The results demonstrated that the room-temperature synthesis could avoid the tediousness of typical hot-injection at high temperatures and this method could be widely applied to various optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
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）