ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhenyu Wang,Xinyu Shen,Chengyuan Tang,Xin Li,Junhua Hu,Jinyang Zhu,William W. Yu,Hongwei Song,Xue Bai
Oleylamine and oleic acid are common organic capping ligands used in the hot injection preparation of perovskite quantum dots (QDs). Their labile nature is responsible for the poor colloidal stability and conductivity that affect the performance of perovskite QD light-emitting diodes (LEDs). We introduced 4-trifluoro phenethylammonium iodide (CF3PEAI) directly in the synthesis and found that CF3PEAI efficiently modified the I– vacancy defects on the QD surface and partially substituted the surface capping ligand oleylamine. The strong electron pulling ability of F in CF3PEAI results in a more positive −NH3+ terminal compared to that of PEAI, which promotes tight bonding of CF3PEAI on the surface of CsPbI3 QDs. As a result, we achieved bright QDs with a photoluminescence quantum yield of 92% and efficient red LEDs. The maximal luminance was improved to 4550 cd m–2 for 685 nm red light, which was nearly 4.6-fold of the LEDs with plain CsPbI3 QDs. Additionally, the peak external quantum efficiency reached 12.5%.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1389-1396
·
IF 3.382
Zhuo Chen,Lvming Dong,Hanchuan Tang,Yan Yu,Lei Ye,Jianfeng Zang
One-dimensional all-inorganic halide perovskites have emerged as one of the most prominent materials in the application of optoelectronic devices due to their remarkable properties such as a low number of defects, morphological anisotropy, mechanical flexibility and fast charge transfer capability. Particularly, cubic (α) phase CsPbI3 has the narrowest band gap of 1.73 eV among all-inorganic lead halide perovskites, exhibiting the greatest potential in solar cell applications. However, the direct synthesis of room temperature stabilized α-CsPbI3 nanowires is challenging and remains unfulfilled because the synthesis reaction usually involves a phase change process, resulting in an undesired orthorhombic (δ) phase with a wider bandgap of 2.82 eV. Here, we report a low-temperature approach to directly synthesize highly stabilized α-CsPbI3 nanowires. Low reaction temperature, capping ligand protection, and extended growth time are employed to successfully grow α-CsPbI3 nanowires. The as-synthesized α-CsPbI3 nanowires are 10–20 μm in length and 5–80 nm in diameter. The X-ray diffraction (XRD), photoluminescence (PL), and UV-vis absorption results verify that these cubic phase nanowires maintain excellent stability at room temperature for 90 days. The CsPbI3 nanowires show a PL peak located at around 685 nm and the UV-vis absorption spectrum further reveals that the band gap is about 1.77 eV. The excellent optical properties of the phase-stable CsPbI3 nanowires offer great potential in the field of optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zelong Zhang,Linli Shen,Yi Zhao,Yujie Zhang,Haisheng Yang,Weidong Xiang,Xiaojuan Liang,Guoxin Chen,Haitao Yu
Many previous studies have reported that because of the large difference between the ionic radii of Cl and I, halogen exchange is difficult to occur between CsPbCl 3 and CsPbI 3 perovskite nanocrystals, and the interaction between CsPbCl 3 and CsPbI 3 NCs will lead to their dissolution. In this work, two kinds of nanocrystals, CsPbCl 3 and CsPbI 3 , were successfully crystallized simultaneously in glass by an in-situ growth method for the first time. Because of the effective reabsorption of photons, the CsPbCl 3 :CsPbI 3 nanocrystals displayed higher fluorescence emission intensity and higher photoluminescence quantum yield than those of CsPbI 3 nanocrystals. In addition, CsPbCl 3 :CsPbI 3 nanocrystal glasses showed excellent water resistance and thermal stability, which benefited from the effective protection of the glass matrix. In particular, the fluorescence intensity of the nanocomposites remained above 95% after immersion in water for 60 days. Light-emitting devices were prepared by combining a near-infrared-emitting CsPbCl 3 :CsPbI 3 nanocrystal glass and 400 nm LED chip, which were applied to indoor plant growth.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 19
·195201
·
IF 3.5
Xiufeng Song,Yuxuan Jian,Xusheng Wang,Jiawei Chen,Qingsong Shan,Shengli Zhang,Zhanyang Chen,Xiang Chen,Haibo Zeng
Perovskites have showed significant potential for the application in photodetectors due to their outstanding electrical and optical properties. Integrating two-dimensional (2D) materials with perovskites can make full use of the high carrier mobility of 2D materials and strong light absorption of perovskite to realize excellent optoelectrical properties. Here, we demonstrate a photodetector based on the WTe2/CsPbI3 heterostructure. The quenching and the shortened lifetime of photoluminescence (PL) for CsPbI3 perovskite confirms the efficient charge transfer at the WTe2/CsPbI3 heterojunction. After coupled with WTe2, the photoresponsivity of the CsPbI3 photodetector is improved by almost two orders of magnitude due to the high-gain photogating effect. The WTe2/CsPbI3 heterojunction photodetector reveals a large responsivity of 1157 A W−1 and a high detectivity of 2.1 × 1013 Jones. The results pave the way for the development of high-performance optoelectronic devices based on 2D materials/perovskite heterojunctions.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Meng Li,Xiao Zhang,Peng Wang,Ping Yang
Research on anion exchange reactions (AERs) indicated that the reaction rate has a significant influence on the photoluminescence properties and crystal structures of the resulting CsPb(Br/I)3 nanocrystals (NCs). Controllable AERs were achieved by controlling the reaction rate. Using controllable AERs, metastable γ-CsPbI3 NCs were directly obtained from the aged orthorhombic CsPbBr3 NCs. Rietveld refinement indicated that the crystal structure of parent CsPbBr3 was maintained without any phase transition or degradation. The prepared γ-CsPbI3 NCs exhibited good stability at room temperature. X-ray photoelectron spectroscopy analysis demonstrated the presence of Br and the high binding energy of Pb–Br bonding. Pb–Br bonds maintained the parent orthorhombic CsPbBr3 structure and increased the stability of γ-CsPbI3 NCs. Controllable AERs provide versatile methods to maintain the parent perovskite structure and synthesize CsPbI3 NCs with a more rigid crystal structure. They pave the way for the preparation of NCs, which are difficult to synthesize directly.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jifeng Yuan,Jianjun Tian
Perovskite quantum dots (PQDs) have gained significant attention due to their exceptional optical and electronic properties, rendering them promising materials for various optoelectronic applications, such as single-junction solar cells because of the multiple exciton generation effects. To improve the electrical properties of CsPbI3 PQDs, ligand engineering was explored by introducing short-chain ligands to exchange the original long-chain ligands on the PQD surface during the purification process. However, the short-chain ligands suffer from low solubility in the anti-solvent, resulting in insufficient ligand exchange. To address this issue, we developed an in-situ ligand exchange (ILE) strategy to promote the replacement of long-chain ligands with short-chain ones, leading to improved surface chemistry. In this work, 4-methoxyphenethylammonium iodide (CH3O-PEAI) was demonstrated as the short-chain ligand in the ILE strategy, thereby modifying halide vacancy trap states, and promoting carrier transportation and extraction. As a result, the ILE-CsPbI3-based solar cells achieved a higher power conversion efficiency of 14.4% with a high open circuit voltage (VOC) of 1.23 V and exceptional long-term durability due to higher hydrophobicity.
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
Materials Today Energy
·
2024
·
IF 9
Haochen Liu,Xiangtian Xiao,Ye Wu,Ding Zhu,Jiayun Sun,Desui Chen,Bing Tang,Shixun Wang,Arsenii Portniagin,Kunnathodi Vighnesh,Wallace C.H. Choy,Andrey L. Rogach
Pure-red emission light-emitting diodes (LEDs) are highly desirable for display and lighting applications. Here, we present a synergistic approach to fabricate pure-red emission LEDs based on quantum-confined CsPbI 3 nanocrystals (NCs). By introducing ZnI 2 acting as a co-precursor and passivating agent into the synthesis, and applying a gradient post-synthesis purification method allowing us to obtain size-selected fractions with precisely adjusted emission colors, we obtained uniform and small (about 6 nm), quantum-confined CsPbI 3 NCs exhibiting high stability in ambient conditions and a superior photoluminescence quantum yield of up to 88%. These NCs exhibited the tendency to undergo oriented attachment, resulting in self-assembled superstructures with a pure-red emission at 629 nm. Importantly, partial recrystallization into fused superstructures led to removal of the insulating ligand barriers between NCs. LEDs based on the CsPbI 3 NCs showed pure-red electroluminescence at 633 nm, with an external quantum efficiency of 14.7% and a luminance of over 1000 cd/m 2 . Our study reveals the mechanism behind the oriented attachment and assembly of small, quantum-confined CsPbI 3 NCs, and contributes to the development of pure-red electroluminescent LEDs.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 7
·2300022
·
IF 7.9
Mengqi Liu,Linrui Duan,T. Jesper Jacobsson,Jingshan Luo
Inorganic CsPbI 3 perovskite solar cells (CsPbI 3 PSCs) have attracted extensive attention because of their excellent thermal stability and appropriate bandgap for tandem solar cells. At present, intermediate phase engineering with organic additive, e.g., dimethyl amine iodide (DMAI), is the most common method to obtain high-efficiency CsPbI 3 PSCs. However, it remains controversial whether the intermediate phase is entirely converted into a pure CsPbI 3 phase. By exploring the effect of annealing temperature, herein, it is demonstrated that substantial organic residues remain in the produced films while using the current standard recipes of DMA + -assisted synthesis of Cs 1− x DMA x PbI 3 perovskites. Thermal gravimetric and nuclear magnetic resonance show that DMA + remains in films annealed at a standard annealing temperature of 190 °C. The DMA + does, however, disappear if the annealing temperature is increased to 340 °C, which leads to a larger grain size, a contraction of the lattice, a narrower bandgap, and a redshift of the absorption onset. Though both Cs 1− x DMA x PbI 3 and CsPbI 3 perovskite solar cells show decent efficiencies, the pure CsPbI 3 perovskite solar cells annealed at a higher temperature demonstrate higher operational stability.
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
Joule
·
2022
·
IF 46.048
Xiuhong Sun,Zhipeng Shao,Zhipeng Li,Dachang Liu,Caiyun Gao,Chen Chen,Bingqian Zhang,Lianzheng Hao,Qiangqiang Zhao,Yimeng Li,Xianzhao Wang,Yue Lu,Xiao Wang,Guanglei Cui,Shuping Pang
Summary The open-circuit voltage ( V OC ) of cesium-based perovskite solar cells (Cs-PSCs) is severely limited by carrier recombination both in bulk and at the interface of the perovskite layer, which mainly roots in its elevated fabrication temperature. Enhancing the quality of perovskite film and optimizing the device structure are effective strategies to improve the performance of Cs-PSCs. Here, the V OC is markedly promoted by constructing CsPbI 3 /Cs 1-x DMA x PbI 3 bulk heterojunction (BHJ) structure, which was spontaneously formed by a precisely controlled spatially selective phase transition method. The perovskite BHJ structure not only facilitates the charge separation and collection process by enhancing the built-in potential but also obviously reduces the carrier recombination loss. Importantly, a maximum V OC of 1.23 V was obtained as the V OC deficit was 0.45 V, and the champion power conversion efficiency (PCE) reached 20.32% (certified PCE of 19.66%). Our finding indicates that junction engineering will be a new strategy for efficient perovskite devices.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 10
·2103690
·
IF 29.698
Fanqi Meng,Bingcheng Yu,Qinghua Zhang,Yuqi Cui,Shan Tan,Jiangjian Shi,Lin Gu,Dongmei Li,Qingbo Meng,Cewen Nan
Aiming at stable CsPbI 3 perovskite solar cells, Ge incorporated for the first time into DMAPbI 3 -based precursor systems. Ge incorporation is found to be able to modify crystallization growth of CsPb 1− x Ge x I 3 films and reduce annealing temperature and treatment time by lowering CsPbI 3 formation energy. The champion power conversion efficiency (PCE) of 19.52% is achieved with a certified PCE of 18.8%, which is the highest performance of CsPbI 3 PSCs with alien element-doping. In addition, in situ formation of GeO 2 can passivate the grain boundary and surface defects, thus significantly improving the moisture resistance of the perovskite film and related devices. Excellent operational stability is achieved with no PCE degradation over 3000 h at a fixed bias voltage of 0.85 V under continuous white LED (6500 K) illumination and a nitrogen atmosphere. This work demonstrates that Ge-incorporation is a promising way to stabilize CsPbI 3 perovskite solar cells by simultaneously improving perovskite crystallinity and passivating the grain boundary and interfacial defects.
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ou Hai,Jian Li,Mengkang Pei,Qiang Ren,Xiulan Wu
The construction of visible full-spectrum tunable afterglow luminescence is of great significance for long afterglow materials. Here we developed a new composite material whose afterglow were continuously tunable from blue to red light, we prepared CsPbI 3 quantum dots (QDs) by thermal injection method and added passivators to obtain relatively more stable QDs materials, the SDS-CsPbI 3 QDs after passivation treatment was more than twice the photoluminescent (PL) intensity of the original QDs after 10 days, which has a positive effect on the large-scale production and application of all-inorganic perovskite QDs. By uniformly distributing CsPbI 3 QDs on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) by Stöber method, a color-tunable long-persistence luminescent material CsPbI 3 /SMS@SiO 2 was prepared, and the tunable afterglow glows from 465 nm to 700 nm was realized by optical conversion. In addition, the PL intensity of the composite material under ultraviolet light is increased by more than 50%, and it can remain stable for a long time; its high temperature resistance is also improved to 140 °C; and the luminous intensity after 10 days remains at a high level. This research also provides new ideas and methods for the development of multicolor long afterglow materials.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1670
·
IF 4.2
Jianfeng Wen,Xin Du,Feng Hua,Yiting Gu,Ming Li,Tao Tang
The aqueous instability of halide perovskite seriously hinders its direct application in water as a potential photocatalyst. Here, we prepared a new type of polyvinylpyrrolidone (PVP) passivated δ-CsPbI3(δ-CsPbI3@PVP) microcrystal by a facile method. This material can be uniformly dispersed in water and stably maintain its crystal structure for a long time, breaking through the bottleneck of halide perovskite photocatalysis in water. Under visible light, δ-CsPbI3@PVP can almost completely photodegrade organic dyes (including Rhodamine B, methylene blue, and crystal violet) in only 20 min. The efficient photocatalytic activity is attributed to the enhanced visible light absorption arising from PbI2defects in δ-CsPbI3@PVP and the intrinsic low photoluminescence quantum yield of δ-CsPbI3, which induces efficient light absorption and photocatalytic activity. We highlight δ-CsPbI3@PVP as an effective aqueous photocatalyst, and this study provides new insights into how to exploit the potential of halide perovskite in photocatalytic applications.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）