Solar RRL
·
2019
·Vol. 3
·期 4
·1800354
·
IF 0
Zheng-Ji Zhou,Yue-Qing Deng,Pan-Pan Zhang,Dong-Xing Kou,Wen-Hui Zhou,Yue-Na Meng,Sheng-Jie Yuan,Si-Xin Wu
All-inorganic CsPbBr 3 perovskite solar cells (PSCs) have recently generated tremendous interest in next-generation cost-effective and stable photovoltaic devices. However, the commonly used costly and unstable organic hole transporting material (HTM) has so far prevented the further development and large-scale application of PSCs. In this work, Cu 2 ZnSnS 4 quantum dots (CZTS QDs) are exploited as a novel inorganic HTM for CsPbBr 3 PSCs. Due to the well-matched energy levels with the inorganic perovskite layer, a decent power conversion efficiency of 4.84% is achieved, which is quite comparable to the efficiency of the traditional device based on spiro-OMeTAD HTM (5.36%). Moreover, the photoluminescence (PL) and impedance spectroscopy further demonstrate the more effective hole extraction and transfer properties of the CZTS QDs interface layer, making it a promising material for fabricating efficient and stable PSCs toward practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Mixue Tang,Benlin He,Dawei Dou,Yu Liu,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
The perovskite film with large grain size and low defect states density is technically important to improve the power conversion efficiency and environmental stability of perovskite solar cells (PSCs). In the present work, we raise a compositional engineering strategy of inorganic CsPbBr 3 perovskite films by substituting partial Pb 2+ with divalent transition metal ions having smaller ionic radius (TM 2+ = Mn 2+ , Ni 2+ , Cu 2+ and Zn 2+ ). The photovoltaic performances of hole transporting layer-free all-inorganic CsPbBr 3 PSCs are markedly improved through maximizing grain size with few grain boundaries as well as low trap states density and minimizing energy loss in charge carrier transfer. A champion power conversion efficiency as high as 9.18% is achieved for the all-inorganic CsPb 0.995 Zn 0.005 Br 3 PSC free of encapsulation, which shows a remarkable long-term stability over 760 h in 80% humidity air atmosphere at 25 °C. The high efficiency and improved stability demonstrate compositional engineering is a promising strategy to forward high-quality perovskite films and high-performance of all-inorganic CsPbBr 3 PSCs.
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高影响因子
ACS Nano
·
2024
·
IF 15.8
Yuan Wang,Mu-Sen Song,Jiaqi Zhao,Zhen Li,Tinglei Wang,Hai Wang,Hai-Yu Wang,Yu Wang
This work reports the synthesis of chiral perovskite heterostructure films by combining a two-dimensional (2D) chiral (R-/S-MBA)2PbI4 perovskite with CsPbBr3 quantum dots (QDs). The as-synthesized chiral heterostructure films exhibit obvious circularly polarized luminescence (CPL) properties, even though pure 2D chiral perovskite cannot present photoluminescence. It indicates that the chirality of the excited state of the QDs originates from the 2D chiral perovskite. The circular polarization-resolved transient absorption (TA) spectra further demonstrate that the CPL response of heterostructure films originates from the energy transfer between the chiral perovskite layer and QDs layer and the suppression of spin relaxation, which induces the imbalance of the spin population of excited states in QDs layer. In addition, the photoluminescence (PL), circular dichroism (CD), and CPL spectra of these heterostructure films can be controlled by varying the thickness and component of the chiral perovskite layer, which demonstrates that the anion exchange between chiral perovskite and CsPbBr3 QDs can tune the chemical composition and optoelectronic properties due to the low bonding energy difference between them and decrease the strain within the QDs layer to reduce the radiative recombination lifetime. This work provides guidance for the synthesis of chiral perovskites with a strong CPL response and further provides insight into the origination of CPL.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shanting Zhang,WeiWei Zhu,Xin Zhang,LiangHui Mei,Jian Liu,Fangbin Wang
With the growing global concern over food safety, the rapid detection and disinfection of foodborne pathogens have become critical in public health. This study presents a novel machine learning-driven fluorescent sensor array utilizing aqueous CsPbBr 3 perovskite quantum dots (PQDs) for the rapid identification and eradication of foodborne pathogens. The relative signal intensity changes (ΔRGB) generated by the sensor array were analyzed using the machine learning algorithm—Support Vector Machine (SVM). The study achieved the identification and recognition of five pathogens and their mixtures within a concentration range of 1.0 × 10 3 to 1.0 × 10 7 CFU/mL with an accuracy rate of 100 %, and the limits of detection (LOD) for the pathogens were found to be low. Additionally, the array also showed excellent performance in the identification of pathogens in tap water, achieving an accuracy rate of 100 %. Furthermore, the fluorescent sensor array was capable of inactivating the pathogens with an efficiency of over 99 % within 30 min post-detection. This development provides an efficient and reliable tool for the field of food safety detection.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Yuhan Deng,Yujie Yuan,Jian Ni,Lei Zheng,Jinlian Bi,Jia Guo,Rufeng Wang,Haoxuan Li,Shuai Zhang,Hongkun Cai,Jianjun Zhang
All-inorganic perovskite quantum dots (PQDs) have sparked a research boom due to their superior optoelectronic properties. However, current synthesis methods are complex and unsuitable for large-scale continuous production because the rapid reaction kinetics of quantum dots (QDs) make regulating their nucleation and growth challenging. Herein, we developed an efficient microfluidic technology using temperature-assisted base-acid ligand modulation to control the nucleation and growth of PQDs for mass fabrication. The obtained CsPbBr3 PQDs exhibited high dispersion, uniform sizes, and high photoluminescence quantum yield. Moreover, CsPbBr3 maintained high photoluminescence intensity for 120 min under UV irradiation, demonstrating good stability. These results provide a promising pathway for large-scale PQD production, which is crucial for advanced optoelectronic applications. Compared with the traditional hot injection (HI) and ligand-assisted reprecipitation (LARP) methods, microfluidic technology significantly saves materials and reagents. The microfluidic technology is also helpful for precisely controlling the nucleation process of QD growth.
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Nanoscale
·
2018
·Vol. 10
·期 14
·6704-6711
·
IF 7.233
Yu Chen,Minghuai Yu,Shuai Ye,Jun Song,Junle Qu
Lead halide perovskite nanocrystals with efficient two-photon absorption and ease of achieving population inversion have been recognized as good candidates to achieve frequency up-conversion for biophotonics applications, but suffer from the limitation of the miniaturization of the device and its corresponding poor stability when exposed to atmospheric moisture. Here we demonstrate the miniaturization of plasmonic nanolasers via embedding perovskite quantum dots (QDs) in rationally designed dual-mesoporous silica with gold nanocore. The nanocomposite supports resonant surface plasmon-polaritons (SPPs), which overlap both spatially and spectrally with the CsPbBr3 QDs. The outcoupling between surface plasmon oscillations and photonics modes within a wavelength range completely overcomes the loss of localized surface plasmons, and finally contributes to a novel application of two-photon-pumped nanolasers. Large optical gain under two-photon excitation was observed as a result of resonant energy transfer from excited perovskite QDs to surface plasmon oscillations and stimulated emission of surface plasmons in a luminous mode. The outmost organic–inorganic hybrid shells of the dual-mesoporous silica nanocomposites act as a protective layer of the perovskite QDs against water and endow the nanocomposites with superhydrophobicity. This work provides an alternative inspiration for the design of new two-photon pumped nanolasers.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Peng Zhang,Feiming Li,Shujuan Lin,Wen-Jie Chen,Dejian Chen
Lead halide perovskite nanocrystals (PNCs) have emerged as promising materials for photocatalysis due to their exceptional optoelectronic properties, yet achieving efficient charge separation and selective oxidation reactions remains a significant challenge. In this study, we report the synthesis of Fe 3+ -doped CsPbBr 3 /SiO 2 nanocomposites (Fe-PNCs/SNPs) with gradient energy levels, designed to enhance photocatalytic performance. Our results demonstrate that Fe 3+ doping introduces mid-gap states, promotes photoinduced charge separation, and generates reactive oxygen species (ROS) such as O 2 − and OH radicals under sunlight-simulating light irradiation from a 300 W Xe arc lamp. The Fe 20 -PNCs/SNPs catalyst achieved over 99 % conversion of benzyl alcohol to benzaldehyde with high selectivity and stability in the ethanol under ambient conditions. Additionally, the catalyst exhibited excellent recyclability and broad substrate tolerance. These findings highlight the innovative design of gradient energy levels in perovskite nanocomposites, offering a new strategy for enhancing photocatalytic efficiency in selective organic transformations.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Xinxin Guo,Yuchen Lv,Liwei Wang,Hongyu Liu,Wenzhi Wang
All inorganic perovskite quantum dots (PQDs) have great application prospects in the lighting and display fields due to their excellent photoelectric properties. However, their instabilities in water and high temperature lead to photoluminescence (PL) quenching, and colloidal synthesis methods usually use a mass of organic solvents, limiting their practical application. Herein, we successfully synthesized mesoporous silica (m-SiO 2 ) and employed a confinement effect to successfully synthesize CsPbBr 3 @m-SiO 2 powders using a simple high-temperature solid-phase synthesis method in an air atmosphere. When the m-SiO 2 content is 0.2 g, optimal green luminous intensity is achieved with a peak wavelength of 522 nm and a full width at half maximum (FWHM) of 23 nm. CsPbBr 3 @m-SiO 2 powders have excellent thermal stability, the PL spectral shapes do not change and the PL intensity can maintain 88.1 % of the original level after 10 heating cycles (200 °C). In addition, CsPbBr 3 @m-SiO 2 powders exhibit excellent water stability, which can still be well dispersed after 30 days exposure to water, and the PL strength remain basically unchanged. This study presents a novel approach for the advancement of stable perovskite luminescent materials.
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CARBON
·
2024
·
IF 10.5
Xi Wang,Yujie Gao,Jianing Guo,Mingxing Wu
Carbon-based hole transport layer (HTL)-free all-inorganic perovskite solar cells (C-PSCs) exhibit advantages of simplified preparation procedure, high stability, and low cost, showcasing significant application potential. Nonetheless, the development of C-PSCs requires overcoming challenges such as the misalignment of energy levels between carbon counter electrode and the CsPbBr₃ perovskite, abundant defects at the perovskite/carbon back interface, and the carbon counter electrode's low conductivity. Herein, VS₄ and VO-deposited carbon nanofibers (CNF), termed VS₄@CNF and VO@CNF respectively, have been synthesized to adjust the work function and improve the conductivity of the carbon counter electrode. CsPbBr₃-based C-PSCs employing VS₄@CNF and VO@CNF as counter electrodes yield power conversion efficiencies of 7.88 % and 8.80 %, indicating great PCE enhancements of 15.4 % and 28.8 % as compared with the device with unmodified CNF counter electrodes. This improvement is attributed to the optimized conductivity and adjusted work function of the counter electrodes, which can optimize the energy level alignment, thereby enhancing charge carrier extraction and transport while effectively inhibiting recombination. Furthermore, VS₄@CNF and VO@CNF demonstrate a notable passivation effect on defects at the back interface. This study offers a valuable path for the design of novel carbon counter electrodes and the modification of the back interface in carbon-based all-inorganic C-PSCs.
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ACS Nano
·
2025
·
IF 16
Xianyao Wu,Lanjing Wang,Guoshuai Zhang,Lin Ma,Dawei Wang,Yafei Zhang,Yuxin Bao,Xiaojia Wu,Xiang Li,Yufeng Hu,Hong-shang Peng
Silica coating is widely employed to improve the stability of perovskite quantum dots (PQDs) as light conversion phosphors. When used in combination with micro-light-emitting diodes (micro-LEDs) for next-generation displays, however, most silica-coated PQDs (Si-PQDs) face some challenges: (i) polarity mismatch between silica and organic solvent undermines the fabrication of the phosphor film by unstable PQD ink; (ii) aggregation-induced large particle size hinders the micron-scale processability. Herein, we report a ligand-assisted silica-coating strategy to prepare highly monodispersed Si-PQDs for micro-LEDs. Briefly, pristine CsPbBr3 QDs capped with aminosiloxane were first formed followed by surface passivation with the zwitterionic ligand lecithin and subsequent tetramethoxysilane-mediated silica coating. The as-prepared Si-PQDs were highly monodispersed with well-defined core–shell structure, exhibiting uniform rectangular morphology, narrow-band green emission, ultrahigh photoluminescence quantum yield (∼98%), and high stability against light and water. Importantly, the Si-PQDs were well dispersed in organic solvents, which could not only be fabricated into white LEDs and screen-printed patterns but also patterned into uniform 20 μm pixels using a microfluidic technique. These results demonstrate that the one-pot synthesized Si-PQDs are very promising light conversion phosphors for micro-LED-based displays and solid-state lighting.
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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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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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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