ACS Applied Nano Materials
·
2023
·
IF 5.9
Hongyu Lv,Xin Tang,Menglu Chen
With high quantum efficiency, unique bandgap, and narrow emission band, all-inorganic CsPbI3 halide perovskite nanocrystals have been widely acknowledged as competitive candidates for pure red light-emitting diodes (LEDs). However, the large-scale manufacturing and stability of CsPbI3 perovskites are the main obstacles for practical LEDs. In this work, by Mg2+/Yb3+ codoping, we successfully improve the luminous intensity (192%) in an ambient environment. What is more, these ionic doped CsPbI3 perovskite nanocrystals are thermally stable at 120 °C. Based on these perovskite nanocrystals, we also fabricate large-scale patterned LEDs (25.4 × 25.4 mm). At a bias voltage of 6 V, the fabricated LEDs exhibit a luminance of 749 cd m–2. At a current density of 6.4 mA cm–2, the fabricated LEDs achieved an external quantum efficiency of 10.9%. This result is expected to fuel the rapid growth of large-area pure red LEDs.
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Miao Yan,Jian Ni,Shanjing Liu,Yuchen Miao,Yuhang Wang,Haoxuan Li,Xinyu Song,Guijun Li,Tiantian Li,Yingtang Zhou,Ying Zhang,Juan Li,Hongkun Cai,Jianjun Zhang
Perovskite quantum dot (PQD) solar cells based on CsPbI3 have attracted considerable attention owing to their excellent optoelectronic properties. Continuous progress in ligand engineering has significantly improved their power conversion efficiency. However, limited attention has been paid to the hindered charge transport between the electron transport layer and the PQD layer caused by vacancy defects at the interface. Here, 6-aminonicotinic acid (AMC) molecules are introduced as a multifunctional interfacial modifier between the TiO2 ETL and the PQD layer to simultaneously passivate oxygen-vacancy defects and induce dipole-field-assisted interlayer charge transport. Experimental characterization and density functional theory calculations demonstrate that AMC molecules not only effectively passivate oxygen vacancies on the TiO2 surface but also accelerate electron extraction by regulating the interfacial energy-level alignment through dipole-field effects. Furthermore, interfacial modulation by AMC improves the crystallographic orientation and film uniformity of the PQD layer. As a result, the device efficiency is enhanced from 13.1 to 15%. This work provides an effective interfacial engineering strategy for improving charge transport and device performance in PQD solar cells.
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DOI
PubMed
高影响因子
Materials Today Communications
·
2026
·
IF 4.9
Zhangwei Guo,Zhuolu Li,Yi Wu,Song Wang,Jiaxin Rui,Zhaogang Teng,Lihong Qi,Kai Pan
One-dimensional (1D) CsPbI 3 nanomaterials with long carrier lifetimes, high carrier transport efficiencies, and anisotropic optical properties show promising applications in lasers and photodetectors. In this study, monodisperse Cs 4 PbI 6 nanocrystals (NCs) (12.3 nm) were first synthesized by thermal injection. The addition of deionized water to this solution then induced the conversion of Cs 4 PbI 6 NCs into CsPbI 3 NCs, followed by their self-assembly into CsPbI 3 nanorods (NRs) with controllable aspect ratios. This process leverages the high solubility of CsI in water, which drives the decomposition of Cs 4 PbI 6 and the formation of CsPbI 3 NCs, which subsequently self-assembled and fused into CsPbI 3 NRs. CsPbI 3 NRs synthesized under the optimal reaction conditions were characterized by uniform size and regular morphology, with a diameter of 12.4 nm and length of 52.5 nm. XRD analysis shows that these monodisperse CsPbI 3 NRs, in contrast to 1D CsPbI 3 nanomaterials synthesized by the conventional thermal injection method, possess a typical cubic phase (α-phase) structure and exhibit good red light emission properties. Due to kinetic limitations during rapid nucleation at the nanoscale, the system preferentially forms the metastable α-CsPbI 3 , characterized by a low nucleation barrier and strong structural inheritance, rather than the thermodynamically stable δ-phase. Compared with NRs obtained under other reaction conditions, the optimal CsPbI 3 NRs demonstrate stronger fluorescence intensity and longer fluorescence lifetime. The CsPbI 3 NRs synthesized under the optimal conditions (2 mL water, 5 min) exhibit a strong first exciton absorption peak at 450 nm, a narrow photoluminescence emission peak at 695 nm, a lifetime as high as 239.9 ns, and a higher exciton binding energy (72.5 meV), ensuring efficient exciton emission at room temperature. Compared with NRs obtained under other reaction conditions, these optimally synthesized NRs demonstrate stronger fluorescence intensity and longer fluorescence lifetime. This work presents a reliable method for the controlled synthesis of 1D α-CsPbI 3 NRs, offering a theoretical and experimental foundation for the application of halide perovskite nanorods in high-performance optoelectronic devices.
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DOI
高影响因子
Science China-Materials
·
2026
·
IF 7.7
Tan Jieke,Xu Dongfang,Li Yong,Fan Zihao,Cai Yan,Wang Zezhang,Li Gaofeng,Chen Haining,Li Yongzhe,Lei Hongjie,Liu Shengzhong,Liu Zhike
All-inorganic, hole-transport-material-free (HTM-free), carbon-based perovskite solar cells (C-PSCs) have garnered significant attention due to their exceptional stability and low cost. However, their performance and commercial potential are still constrained by issues such as poor interfacial contact, insufficient crystallinity, and energy level misalignment. In this work, we tackle these challenges via a molecular engineering strategy by introducing tetrakis(4-ethynylphenyl) methane (TEPM) as a multifunctional additive. The alkynyl moiety (C≡C) in TEPM coordinates with Pb 2+ ions in perovskite precursors, thereby synergistically slowing crystallization kinetics to regulate crystal growth and passivate deep-level defects. As a result, the CsPbI 3 films exhibit larger grain sizes, improved crystallinity, and lower defect densities. Devices modified with TEPM achieved a record power conversion efficiency (PCE) of 20.01% (certified 19.58%). Additionally, unencapsulated devices retained 87.6% of their initial efficiency after 1080 h under ambient conditions (25 °C, 30% relative humidity), and maintained 94.0% of their initial efficiency after 730 h of continuous AM 1.5G illumination in air. The alternative text for this image may have been generated using AI.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Hai Huang,Zijian Geng,Ankang Wan,Chunyan Cao,Daqin Chen,An Xie
Cesium lead halide (CsPbX3; X = I, Br, Cl) perovskite quantum dots (PQDs), owing to their outstanding optoelectronic properties, are regarded as highly promising color conversion layer materials for next-generation wide-color-gamut display technologies. Unfortunately, compared with the increasingly mature production process of green-emitting CsPbBr3 QDs, red-emitting CsPbI3 QDs suffer from irreversible phase transitions induced by environmental stresses, leading to performance degradation that limits their applications in LEDs. The preparation of CsPbI3 QDs with both high photoluminescence quantum yield (PLQY) and stability remains a significant challenge. In this study, based on a low-temperature in situ crystallization process, we propose a synergistic optimization strategy combining metal ion doping and ligand engineering. By introducing phenethylammonium iodide (PEAI) as a surface ligand, we effectively reduced the defect density on the QDs surfaces, thereby enhancing luminescence. Meanwhile, through systematic optimization of Zn2+ doping concentration, we successfully fabricated Zn2+-doped CsPbI3/PVDF composite films with excellent luminescent properties, achieving a PLQY of 86%. Furthermore, by integrating the Zn2+-doped CsPbI3/PVDF composite film with a green-emitting film, we constructed a dual-emissive-layer architecture and successfully fabricated a white-light-emitting device driven by a blue light-emitting diode (LED). The device exhibited an outstanding wide color gamut (121% of the National Television System Committee standard and 91% of Rec. 2020), along with excellent operational stability, highlighting the promising potential of CsPbI3 QDs for white-light LED applications.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
发光二极管（LED）
·
钙钛矿材料
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产品关联
DOI
PubMed
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Qingyuan Qiao,Zhaohui Shen,Na Jiang,Pengjie Song,Dandan Song,Bo Qiao,Suling Zhao,Zheng Xu
In order to improve all-inorganic perovskite nanocrystals (NCs) optical properties and stability, multidentate chelating ligands of Ethylenediaminetetraacetic Acid (EDTA) and Glutathione (GSH) were introduced into CsPbI 3 NCs system. After ligand-exchange, a great improvement in both photoluminescence (PL) and electroluminescence (EL) performance around 682 nm was observed, which shows the trap state density dramatically decline due to the synergistic effect of both EDTA and GSH on NCs surface. Furthermore, the photoluminescence quantum yield (PLQY) improved from 72.9% to 94.3% and their PL stability was prolonged. Meanwhile, E + G treated CsPbI 3 NCs could maintain their optical performance in the polar environment without dissociation, retaining strong fluorescence in ethanol beyond one month. A deep red light-emitting device based on the E + G treated CsPbI 3 NCs as the emission layer was fabricated. High electroluminescence of 584 cd m −2 and external quantum efficiency (EQE) of 8.15% were obtained by E + G treated NCs, which indicated the synergistic effect of EDTA and GSH was feasible and effective in CsPbI 3 NCs surface passivation . This work provided a new thought to combine different ligand-exchange strategies with their virtues for perovskite nanocrystals with more comprehensive performance.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿发光二极管（PeLED）
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DOI
高影响因子
Nanoscale
·
2022
·Vol. 15
·期 3
·1109-1118
·
IF 8.307
Wenlin Xia,Zhenwei Ren,Zhishuai Zheng,Chengzhao Luo,Jie Li,Wenchen Ma,Xin Zhou,Yu Chen
CsPbI3 perovskite nanocrystals (NCs) are gaining popularity as promising photoactive materials for optoelectronic devices. However, their poor phase stability has caused substantial limitations in their practical application. Herein, the small-sized rare earth La cation is strategically introduced to fundamentally improve the NC phase stability against the environment, heat, and UV radiation by the partial substitution of Pb ions to suppress structural distortion and increase the formation energy. The strong interaction between La and I of the octahedra has been demonstrated to enable the effective suppression of the trap states, which promotes strengthened radiative recombination for a near-unity photoluminescence quantum yield (PLQY) of 99.3%. High energy bands have also been found for the La-doped NCs to narrow down the energy barrier for efficient hole injection. The superior optoelectronic properties of La-doped NCs promote great improvements in the perovskite light-emitting diode (PeLED) performances with a 5-fold improvement in external quantum efficiency (EQE) from 1.19 to 6.01% and 2-fold longer lifetime from 1451 to 2956 s. This work provides an effective method for small-sized metal ion-doped CsPbI3 NCs to realize high emission efficiency and phase stabilization for efficient PeLEDs.
研究领域:
材料科学
·
光学工程
·
电子工程
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 21
·7310
·
IF 4.6
Yiting Gu,Xin Du,Feng Hua,Jianfeng Wen,Ming Li,Tao Tang
Inorganic halide perovskite CsPbI3is highly promising in the photocatalytic field for its strong absorption of UV and visible light. Among the crystal phases of CsPbI3, the δ-phase as the most aqueous stability; however, directly using it in water is still not applicable, thus limiting its dye photodegradation applications in aqueous solutions. Via adopting nitrogen-doped graphene quantum dots (NGQDs) as surfactants to prepare δ-phase CsPbI3nanocrystals, we obtained a water-stable material, NGQDs-CsPbI3. Such a material can be well dispersed in water for a month without obvious deterioration. High-resolution transmission electron microscopy and X-ray diffractometer characterizations showed that NGQDs-CsPbI3is also a δ-phase CsPbI3after NGQD coating. The ultraviolet-visible absorption spectra indicated that compared to δ-CsPbI3, NGQDs-CsPbI3has an obvious absorption enhancement of visible light, especially near the wavelength around 521 nm. The good dispersity and improved visible-light absorption of NGQDs-CsPbI3benefit their aqueous photocatalytic applications. NGQDs-CsPbI3alone can photodegrade 67% rhodamine B (RhB) in water, while after compositing with TiO2, NGQDs-CsPbI3/TiO2exhibits excellent visible-light photocatalytic ability, namely, it photodegraded 96% RhB in 4 h. The strong absorption of NGQDs-CsPbI3in the visible region and effective transfer of photogenerated carriers from NGQDs-CsPbI3to TiO2play the key roles in dye photodegradation. We highlight NGQDs-CsPbI3as a water-stable halide perovskite material and effective photocatalytic adjuvant.Keywords:nitrogen doping;graphene quantum dot;perovskite;photodegradation
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Yuwei Duan,Jungang Wang,Dongfang Xu,Peigen Ji,Hui Zhou,Yong Li,Shaoming Yang,Zhuang Xie,Xiaohu Hai,Xuruo Lei,Rui Sun,Zihao Fan,Ke Zhang,Shengzhong Liu,Zhike Liu
To simultaneously stabilize cesium lead triiodide (CsPbI 3 ) precursor solution and passivate the defects in CsPbI 3 film is greatly significant for achieving highly stable and efficient CsPbI 3 perovskite solar cells (PSCs). Herein, an effective redox 4-fluorobenzothiohydrazide (FBTH) is developed to stabilize the precursor solution and passivate iodine/lead-related defects for high-quality CsPbI 3 film. The comprehensive research confirms that 1) a new compound FBTH-I is obtained from an effective redox interaction between FBTH and molecular iodine (I 2 ) in perovskite precursor solution, which can effectively impede the formation of I 2 molecule and restrain I − migration in perovskite film by forming N–H···I bond; 2) FBTH-I can also passivate Pb-related defects via forming S···Pb interaction. Consequently, the CsPbI 3 PSC based on FBTH-treated precursor solution exhibits a fascinating power conversion efficiency (PCE) of 21.41%, which is one of the highest PCE values among the reported pure CsPbI 3 PSCs so far, and an outstanding stability against the harsh conditions, such as thermal annealing and continuous light-illumination.
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
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
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuhuan Lin,Jiayi Li,Jiayu Zheng,Jun Shao,Ming Wu,Yulin Liu,Ziqiao Wu,Jiandong Fan,Wenzhe Li
Cesium-based all-inorganic lead-halide perovskites CsPbX3 (X = I, Br, Cl) have emerged as highly promising optoelectronic materials with a wide bandgap, which are commonly utilized in tandem solar cells. However, the I–Br hybrid CsPbI3–xBrx perovskites still face stability issues such as halide segregation-induced phase transition and decomposition under ultraviolet or high-temperature conditions. We synthesize a series of single crystals DMAPbI3–xBrx (x = 0.1, 0.15, 0.2, 0.3, 0.6), featuring an I–Br ordered distribution. By introducing the crystal intermediate into the perovskite precursor, we successfully obtained high-quality CsPbI3–xBrx thin films, exhibiting high stabilities and low trap state density. The formation kinetics of the high-quality perovskite thin films are in situ studied and the possible reaction mechanisms are proposed. Benefiting from this approach, the solar cells have an improved photoelectric conversion efficiency and significantly enhanced thermal stability. This method is proven to be feasible and innovatively offers a new strategy for the continuous development of mixed-halide perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
钙钛矿太阳能电池
·
晶体工程
·
光电子学
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产品关联
DOI
PubMed
高影响因子
Advanced Electronic Materials
·
2024
·
IF 5.3
Huiyuan Cheng,Yifan Zheng,Yu Lou,Mengjie Sun,Guodong Zhang,Haoran Wang,Tom Wu,Yang Bai,Yuchuan Shao
Metal halide perovskite nanocrystals (PNCs) hold great promise for light-emitting diodes (LEDs) due to their high photoluminescence quantum yields (PLQY), tunable colors, and low-cost solution processability. However, their electroluminescence efficiencies are currently limited by the small size of the PNCs and the weak binding between ligands and PNCs. The small size makes PNCs sensitive to environmental factors due to their large specific surface area, leading to a loss of PLQY during post-treatment. Additionally, the weak binding between ligands and PNCs causes the ligands to detach during post-treatment, further reducing PLQY. To address these challenges, an in situ ligand-capped synthesis method is introduced for PNCs, replacing the aliphatic solvent octadecene (ODE) with trioctylphosphine (TOP). The presence of TOP increases the concentration of monomers, accelerating nucleation and crystal growth, enabling the production of cubic PNCs ranging from 8 nm to over 28 nm. Moreover, TOP acts as a ligand to resurface PNCs, enhancing their stability and maintaining high PLQY after post-treatment. As a result, by utilizing these larger PNCs, a high maximum external quantum efficiency (EQE) of 21.23% in LEDs is achieved. This method provides a significant advancement in the development of high-performance PNC-based LEDs.
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
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