JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Zhanzhen Ma,Qianjin Ye,Sirui Liu,Qunhua Zhong,Guisheng Zhu,Jianjun Zhu,Di Li,Deli Jiang
Designing S-scheme heterojunctions with high charge separation efficiency and strong photo-redox capability is regarded as effective way to enhance the photocatalytic activity, yet achieving S-scheme charge transfer remains challenging. In this work, we report the construction of a well-designed S-scheme heterojunction by integrating carbon vacancies-containing carbon nitride (V C -CN) and CsPbBr 3 quantum dots. Experimental studies and density functional theory (DFT) calculations demonstrate that the enlarged interfacial interaction induced by the V C within CN could achieve a directional S-scheme charge transfer, therefore improving photogenerated carrier separation capability and consequently promoting photocatalytic CO 2 reduction performance. The CO evolution rate over 5 % CsPbBr 3 /V C -CN S-scheme heterojunction is 84.39 μmol·g −1 ·h −1 , which is 16.26 times than that of CN. Our work offers an alternative strategy to construct S-scheme heterojunction photocatalytic for CO 2 reduction via modulating the internal electric filed achieved by defect engineering route.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 6
·4161-4171
·
IF 3.553
Wang Pan,Wu Zhihai,Wu Manyu,Wei Jiao,Sun Yanni,Zhao Zhenfu
The low-cost, solution-processed and stable perovskite quantum dots (QDs) light-emitting diodes (QLEDs) have great potential applications for the new-generation displays technology and white-LEDs. The stability of perovskite QDs has been improved via polymers or inorganic encapsulation strategies, but at the cost of their semiconducting properties, so it is not suitable for active light-emitting devices. In this paper, the Zn-doped CsPbBr 3 /ZnS QDs heterojunction were fabricated via a simple solution-phase method, which demonstrated simultaneously enhanced the optical properties and stability of perovskite QDs films without damaging their semiconducting properties. The photoluminescence quantum yields and stability of the Zn-doped CsPbBr 3 /ZnS heterojunction QDs films have been significantly improved because of good surface passivation on the surface defects of perovskite QDs with ZnS nanoclusters and Zn 2+ doping. Finally, solution-processed n-ZnO nanoparticles (NPs) and p-NiO NPs as carrier transport layers are used to fabricate all-inorganic Zn-doped CsPbBr 3 /ZnS QLEDs. The QLEDs show high-efficiency green light emission with a maximum luminance of 8600 cd/m 2 and external quantum efficiency of 4.8%. Moreover, the researched green perovskite QLEDs also show good working stability after a long test time in the outside environment. This study may provide an effective way for the preparation high-performance perovskite QLEDs with good environmental stability, making practical applications possible.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Mengling Liao,Beibei Shan,Ming Li
All-inorganic CsPbBr3 perovskites have emerged as promising luminescent materials for light-emitting devices owing to their unprecedented photoluminescence (PL) properties. The fundamental understanding of their photophysical properties offers new opportunities to develop high-performance devices. However, the investigation of optical properties of strongly quantum-confined CsPbBr3 perovskites of different morphologies is lacking. Herein, we report the PL properties of strongly quantum-confined CsPbBr3 perovskites with varying dimensionalities, specifically zero-dimensional quantum dots (0D-QDs), one-dimensional quantum wires (1D-QWs), and two-dimensional quantum platelets (2D-QPLs). Results reveal that the PL efficiency displays an overall increase for 0D-QDs and 1D-QWs but a negligible change for 2D-QPLs against the excitation wavelength, all with the observation of multiple local minima. A combined analysis of the excitation wavelength dependence of the PL efficiency, dimensionality dependence of excitonic transition, and time-resolved PL decays implies the presence of two different types of trap states—a continuum of electron trap states and discrete localized trap states. We conclude that both trap states are equally important in both 0D-QDs and 1D-QWs, while discrete localized trap states are dominant in 2D-QPLs. In all these quantum structures, the two trap states do not affect the intrinsic exciton relaxation but could interact with energetically excited electrons beyond the conduction band minimum, thereby decreasing the PL efficiency. Our study presents a fundamental understanding of the PL properties of quantum-confined CsPbBr3 perovskites and may guide the development of the corresponding light-emitting devices.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Yulong Zhang,Long Luo,Jingchen Hua,Chang Wang,Fuzhi Huang,Jie Zhong,Yong Peng,Zhiliang Ku,Yi-bing Cheng
We developed a multiple sequential vacuum deposition method for the preparation of CsPbBr 3 film with pure phase. Meanwhile, we found the annealing humidity plays an important role for the growth of CsPbBr 3 crystal. By controlling the relative humidity at 30%, we obtained high-quality CsPbBr 3 film with large grain size. As a result, a PCE of 8.86% has been achieved in the all-inorganic PSCs with a planar structure of FTO/compact TiO 2 /CsPbBr 3 /carbon.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Honghao Jiao,Yujie Gao,Jianing Guo,Huaiyu Zhang,Mingxing Wu
To enhance the inferior photovoltaic performance of all-inorganic carbon-based perovskite solar cells (C-PSCs) caused by inefficient charge extraction and transport processes of the CsPbBr 3 /carbon back interface, three types of tungsten oxides (WO 3 , WO 2.72 , WO 2 ) are synthesized as low cost and stable hole transport layers (HTLs) to modify the back interface by tunning the energy level alignment. Among the three kinds of tungsten oxides, WO 3 shows the best hole extraction and transport capability and the C-PSCs using WO 3 HTL generates a power conversion efficiency (PCE) of 7.90% with a high open circuit voltage (V oc ) of 1.307 V, indicating a great PCE enhancement of 43.9%, as compared with the device without HTL (5.49%). Meanwhile, WO 2.72 and WO 2 also are also proved to be qualified HTLs and the devices show PCE values of 7.57% and 6.24%, respectively. Importantly, WO 3 and WO 2.72 based device show excellent stabilities with PCE retention over 90% of the initial PCE values under ambient conditions for 60 days.
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ACS Photonics
·
2025
·
IF 6.7
Ruichen Bai,Xin Liu,Zihang Lin,Siliang Hu,Xin Zhang,Johnny C. Ho,Rongrong Guo,Wanqi Jie,Yadong Xu
The CsPbBr3 crystal grown by the solution method is regarded as an attractive and cost-effective material for radiation detection. However, approaching large-size, high-quality CsPbBr3 single crystals is restricted by mass nucleation and an unstable growth interface. Here, the confined geometry assisted solution method is employed to obtain high-quality CsPbBr3 single crystals with dimensions up to 17 × 17 × 2 mm3. High yield growth of CsPbBr3 seed crystals is achieved by adopting 2-bromopropionic acid (2-BPA) in the precursor, which expands the metastable zone twice and reduces nucleation. The crystal growth environment, simulated with a specific laminar flow model, reveals the uniform concentration distribution is realized by suitable forced convection velocity, thereby substantially enhancing the stability of the crystal growth interface. The resulting CsPbBr3 single crystal exhibits low trap density states of 2.27 × 109 cm–3, leading to a high hole mobility of 377.63 cm2 V–1 s–1. Finally, a high sensitivity of 1.6 × 105 μC Gyair–1 cm–2 is realized under 50 kVp X-rays at 500 V cm–1. These results promote the application of large-sized CsPbBr3 single crystals in X-ray radiation detection as well as the reference and guidance for the growth of other perovskite single crystals.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Cong He,Chunwen Ye,Meng Wu,Shiwei Yang,Peiyuan Zhuang,Jiawei Song,Yanjie Zhang
Halide perovskite nanocrystals (NCs) including CsPbBr 3 as the most typical composition , have attracted widespread attention due to their excellent photovoltaic properties . However, CsPbBr 3 NCs encounter the serious problem of instability and luminescent quenching when removing protection from their colloidal solution. Herein, a facile room-temperature saturation recrystallization process is employed to form CsPbBr 3 NCs with an average particle size of ∼1.8 nm on the surface of Cs 4 PbBr 6 support through adjusting Cs/Pb molar ratios (1−10). Interestingly, CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 exhibit an ultra-high quantum yield of ∼98 %. Accordingly, the photoluminescence intensity of CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 is greatly enhanced by about 2900-fold higher than the sample with a Cs/Pb ratio of 1 due to the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunction structure. Subsequently, CsPbBr 3 /Cs 4 PbBr 6 powders are encapsulated in a SBA-15 mesoporous silica and calcined at 700ºC to improve water-resistance properties, which can keep stable in water for more than 100 days. These CsPbBr 3 /Cs 4 PbBr 6 -SBA-15 composites show potential applications in white light-emitting diodes, display light sources , and flexible luminescent films in the field of wearable devices. This work provides a facile way to achieve ultra-high quantum yield through the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunctions .
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Li Yang,Tianwen Xu,Zhongchen Bai,Shuijie Qin
The ZnO/CsPbBr3 heterojunction interface often has poor chemical stability, resulting in the low photovoltaic efficiency of the solar cell. Here, we reported a method to fabricate an electron transport layer (ETL) using an Al element-doped ZnO (AZO) sol to improve the interfacial defects of the ZnO/CsPbBr3 heterojunction. The results showed that the interfacial defects first decreased and then increased with the change of the Al element ratio from 0 to 10%. The device had the least interfacial defects by 7% (atomic ratio) Al doping into ZnO. A 1.27 V open-circuit voltage (VOC) and 6.25% photoelectric conversion efficiency (PCE) were achieved by 7% Al element doping into ZnO in a ZnO/CsPbBr3/carbon structure solar cell. Moreover, the interfacial defect distribution and carrier recombination mechanism of the device were, respectively, illustrated by a varying light intensity test and electrochemical impedance spectroscopy. This work showed that an Al-doped ZnO film prepared by a sol–gel method could significantly improve the performance of solar cells.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yichang Wang,Sixiang Wang,JungHyeon Yoo,DaeHo Yoon,Tianrong Li,Yuhua Wang
In situ fabrication of lead halide perovskite quantum dots (PQDs) is important for narrow-band emitters for LED displays due to the simple work procedure and convenient usability; however, the growth of PQDs is not readily controllable in the preparation, resulting in low quantum efficiency and environmental instability of PQDs. Here, we demonstrate an effective strategy to controllably prepare CsPbBr3 PQDs in polystyrene (PS) under the regulation of methylammonium bromide (MABr) via electrostatic spinning and thermal annealing techniques. MA+ slowed down the growth of CsPbBr3 PQDs and acted as a surface defect passivation reagent, which was proved by Gibbs free energy simulation, static fluorescence spectra, transmission electron microscopy, and time-resolved photoluminescence (PL) decay spectra. Among a series of prepared Cs1–xMAxPbBr3@PS (0 ≤ x ≤ 0.2) nanofibers, Cs0.88MA0.12PbBr3@PS shows the regular particle morphology of CsPbBr3 PQDs and the highest photoluminescence quantum yield of up to 39.54%. The PL intensity of Cs0.88MA0.12PbBr3@PS is 90% of the initial intensity after immersing in water for 45 days and 49% of the initial value after persistent ultraviolet (UV) irradiation for 27 days. A high color gamut containing 127% of the National Television Systems Committee standard with long-time working stability was also obtained on light-emitting diode package measurements. These results demonstrate that MA+ can effectively control the morphology, humidity, and optical stability of CsPbBr3 PQDs in the PS matrix.
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Laser & Photonics Reviews
·
2025
·
IF 10
Yongfeng Liu,Xinyi Wang,Qingyu Xie,Jia Wang,Wenbin Yu,Liang Zhao,Jinpeng Yang,Daofu Wu,Xiaosheng Tang,Shengnan Tian,Li Song,Dongdong Yan,Min Zhou
Quantum-confinement-based blue CsPbBr 3 perovskite quantum dots (PeQDs) have attracted significant research interest in light-emitting diodes (LEDs) due to their outstanding optoelectronic properties, solution-processability, and free from spectral separation. However, their performance lags behind due to low film quality, high trap density, and mismatched carrier transporting. To address these issues, a bifunctional-additive interface engineering is proposed on in situ formed blue Cs 4 PbBr 6 heterostructured CsPbBr 3 (CsPbBr 3 @Cs 4 PbBr 6 ) PeQDs. The introduction of glycine, with an amino group and a carboxyl group, enables the PeQD film high surface uniformity and photoluminescence quantum yield up to 51.6% from mere 14.1% with a peak wavelength at 489 nm, but low trap density and matched transporting of electron and hole. Surprisingly, glycine-treated PeQD films show significantly enhanced stability against air and ultraviolet lamp exposure. Experimental results and density functional theory calculations reveal that the carboxyl group contributes to maintaining the quantum confinement effect, while the amino group promotes optical emission due to its strong binding ability. Furthermore, the resulting CsPbBr 3 @Cs 4 PbBr 6 PeQD-based LEDs demonstrate outstanding performance, with an increase by a factor of 10 in external quantum efficiency to 5.8% and of 13 in operating life to 405 s. This study offers a straightforward approach for developing high-performance blue PeQD LEDs.
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MOLECULES
·
2026
·Vol. 31
·期 6
·1006
·
IF 5.1
Yiting He,Xiayu Zhu,Ajun Li,Shuyuan Lin,Bo Li,Songbin Liu,Xinyu Ye
CsPbBr3perovskite quantum dots (QDs) have attracted significant attention for optoelectronic applications owing to their outstanding optical properties, yet achieving controlled synthesis with high stability under mild conditions remains a challenge. The room-temperature synthesis of CsPbBr3perovskite quantum dots using a coprecipitation method is systematically investigated in this work, with an emphasis on how the structural and optical properties of the QDs are influenced by the Br/Pb ratio and OA/OAm ratio. The findings show that controlling the Br/Pb and OA/OAm ratios can effectively influence the size, crystalline phase, and surface passivation properties of CsPbBr3quantum dots. The photoluminescence peak shifts blue and the bandgap widens when the Br/Pb ratio rises due to a decrease in quantum dot size. This is mainly explained by more effective surface covering by Br−ions and increased quantum confinement effects. The resultant quantum dots demonstrate ideal optical performance at a Br/Pb ratio of 75 and an OA/OAm ratio of 1.5, with dense ligand coverage, superior defect passivation, and markedly improved stability under UV irradiation and in aqueous environments. Variations in the Br/Pb and OA/OAm ratios affect the binding configuration and coverage of ligands on the quantum dot surface, thereby influencing the relationship between non-radiative recombination and the quantum confinement effect. The LED fabricated with the as-synthesized high-performance quantum dots demonstrates a wide color gamut, covering 129.45% of the NTSC standard, indicating strong potential for display applications.
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PubMed
高影响因子
Solar RRL
·
2022
·Vol. 7
·期 3
·2200883
·
IF 9.173
Yujing Jiao,Xinpeng Yao,Fanliang Bao,Jingwei Mao,Haiyan Chen,Yanyan Duan,Peizhi Yang,Qunwei Tang,Benlin He
The photovoltaic performance of perovskite solar cells (PSCs) is immensely related to the perovskite film quality, defect states density, and interfacial energy-level alignment. Herein, a self-polymeric monomer of N-(hydroxymethyl) acrylamide (HAM) with CC, CO, and –NH multifunctional groups is introduced in the preparation of a CsPbBr 3 film by a two-step method to regulate the crystallization process and band structure and simultaneously passivate the dual-ionic defects. The results show that the HAM monomer first undergoes a pre-polymerization in the CsBr precursor aqueous solution after preheating to retard the crystallization of CsPbBr 3 , and subsequently a further polymerization occurs during the annealing of the perovskite film to load at grain boundaries and form the CO⋯Pb (Cs) Lewis acid–base coordination and N–H⋯Br hydrogen bonding. Consequently, a large-grained CsPbBr 3 film with low defect density and optimized band structure is fabricated to effectively suppress nonradiative recombination and accelerate carrier extraction and transport, delivering a champion power conversion efficiency of 9.05% for the HAM-incorporated CsPbBr 3 PSCs, which is much higher than 6.50% efficiency for the reference one. Furthermore, the unencapsulated device maintains over 92% of the initial efficiency after 30 days storage in air with 85% relative humidity or at 85 °C, exhibiting superior moisture and thermal durability.
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