Solar RRL
·
2022
·Vol. 6
·期 10
·2200570
·
IF 9.173
Qiyao Guo,Yuanyuan Zhao,Qunwei Tang,Jialong Duan
A solution to breaking through the Shockley–Queisser efficiency limit of solar cells is to increase the irradiation intensity beyond one standard sun by means of fabricating concentrator photovoltaics (CPVs). Herein, it is demonstrated that the power conversion efficiency (PCE) of carbon-electrode, all-inorganic CsPbBr 3 perovskite solar cell (PSC) can be enhanced to 10.08% under 5 suns from 8.94% under one sun. The efficiency improvement mainly contributes to the especially boosted open-circuit voltage ( V oc ) up to 1.643 V, which is delivered by the high-irradiation enlarged quasi-Fermi-level splitting in CsPbBr 3 perovskite film. The substantially detrimental heat induced by carbon electrode owing to its full-spectral absorbance to light is further used by integrating a Bi 2 Te 3 thermoelectric generator (TEG) into this all-inorganic CsPbBr 3 PSC to play the role of refrigerant under concentrated light condition. The CsPbBr 3 /Bi 2 Te 3 -integrated device achieves a PCE of 12.46% with an ultrahigh V oc of 2.114 V by the photovoltaic–thermoelectric principle. More importantly, the integrated solar cell maintains over 90% of the initial efficiency after 150 h irradiation under 5 suns, suggesting a great potential to enhance efficiency by fabricating integrated perovskite/thermoelectric devices.
研究领域:
材料科学
·
能源技术
·
光伏技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Xiaojing Wan,Ze Yu,Wenming Tian,Fuzhi Huang,Shengye Jin,Xichuan Yang,Yi-Bing Cheng,Anders Hagfeldt,Licheng Sun
All-inorganic cesium lead bromide (CsPbBr 3 ) perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb stability. However, the fabrication of high-quality CsPbBr 3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common solvents. Herein, we report a facile solution-processed approach to prepare high-quality CsPbBr 3 perovskite films via a two-step spin-coating method, in which the CsBr methanol/H 2 O mixed solvent solution is spin-coated onto the lead bromide films, followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film morphology. In this fashion, dense and uniform CsPbBr 3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect density. The effectiveness of the resulting CsPbBr 3 films is further examined in perovskite solar cells (PSCs) with a simplified planar architecture of fluorine‒doped tin oxide/compact TiO 2 /CsPbBr 3 /carbon, which deliver a maximum power conversion efficiency of 8.11% together with excellent thermal and humidity stability. The present work offers a simple and effective strategy in fabrication of high-quality CsPbBr 3 films for efficient and stable PSCs as well as other optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
光电子学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2408
·
IF 5.076
Kailin Chi,Hansi Xu,Bingtao Feng,Xianwei Meng,Daoyu Yu,Qian Li
Due to the low solubility of CsBr in organic solvents, the CsPbBr3film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr3solar cells. In this study, we introduced InBr3into the PbBr2precursor solution and adjusted the concentration of PbBr2, successfully prepared PbBr2with a porous structure on the compact TiO2(c-TiO2) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr3solar cells with high-quality perovskite film. The results reveal that the porous PbBr2structure and the increasing PbBr2concentration are beneficial to increase the thickness of the CsPbBr3films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr3solar cells obtained after conditions optimization was 5.76%.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 4
·e4734
·
IF 3.2
Hao Zhang,Xuemei Wang,Ning Ai,Jianli Wang
Simultaneously improving the stability and photoluminescence quantum yield (PLQY) of all inorganic perovskite nanocrystals (NCs) is crucial for their practical utilization in various optoelectronic devices. Here, CsPbBr 3 NCs coated with polyethersulfone (PES) were prepared via an in-situ co-precipitation method. The sulfone groups in PES bind to undercoordinated lead ion (Pb 2+ ) on the CsPbBr 3 NCs, resulting in significant reduction of surface defects, thus enhancing the PLQY from 74.2% to 88.3%. Meanwhile, the PES-coated NCs exhibit high water resistance and excellent heat and light stability, maintaining over 85% of the initial PL intensity under thermal aging (70°C, 4 h) and continuous 365 nm ultraviolet (UV) light irradiation (24 W, 8 h) conditions. By contrast, the PL intensity of the control NCs dramatically dropped to less than 40%. Finally, a diode emitting bright white light was fabricated utilizing the PES-coated CsPbBr 3 NCs, which exhibits a color gamut of ~110% NTSC standard.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Shipei Sun,Peng Huang,Xian-gang Wu,Cuili Chen,Xiangmin Hu,Zelong Bai,Anatoly Pushkarev,Haizheng Zhong
The ligand exchange of perovskite nanocrystals is crucial for achieving highly efficient and stable light-emitting diodes (PeLEDs). Here, we report the shape transformation of CsPbBr3 nanocrystals from dodecahedron to cube during the ligand exchange using dimethylammonium bromide (DDAB). The shape transformation is thoroughly investigated by experimental characterization and density functional theory calculations, revealing the surface selective etching effect of DDAB. Among the {002}, {220}, and {112} facets in dodecahedron CsPbBr3 nanocrystals, DDAB has the highest binding energy with the (220) facet, which accounts for surface selectivity and shape transformation. PeLEDs based on DDAB-capped CsPbBr3 nanocrystals exhibit average and maximum external quantum efficiencies (EQE) of 14.6 and 18.5%, respectively. Therefore, the ligand exchange using DDAB is an effective strategy for the production of high-quality perovskite nanocrystals for optoelectronic applications.
研究领域:
材料科学
·
光学工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Zhiliang Chen,Yating Zhang,Yu Yu,Yongli Che,Lufan Jin,Yifan Li,Qingyan Li,Tengteng Li,Haitao Dai,Jianquan Yao
Write Once Read Many (WORM) Memory, as one of the most important nonvolatile memory type, has widespread used in a variety of permanent storage applications in the Big Data age. As an excellent material, CsPbBr 3 quantum dots have widely used in a lot of photoelectric devices, but CsPbBr 3 quantum dots based memory device remain to be studied. In this work a WORM memory device based on CsPbBr 3 quantum dots is demonstrated. The CsPbBr 3 QDs based WORM shows great reproducibility, good data retention ability, irreversible electrical transition from the high resistance state (HRS) or OFF state to the low resistance state (LRS) or ON state and the resistance ratio (ON/OFF) can reach almost 10 4 . Additionally, the device exhibits high performances under low power consumption — low reading voltage (−0.5 V) and writing voltage (−1.1V). To study the CsPbBr 3 QDs based WORM provides an opportunity to develop the next generation high-performance and stable WORM devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuanchao Lu,Ruixin Xiong,Xingyu Lin,Liangxiao Zhang,Xianghe Meng,Zisheng Luo
Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
研究领域:
材料科学
·
食品科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 11
·2200276
·
IF 10.947
Hongbin Xiao,Jintao Fu,Xingzhan Wei,Baiqian Wang,Qingkai Qian,Jianfeng Huang,Ru Li,Zhigang Zang
The severe recombination of carriers and poor stability against moisture environment have limited the application of CsPbX 3 (X = Cl, Br, I) nanocrystals in photodetection. Herein, a large-scale synthesis of SnO 2 -coated CsPbBr 3 NCs (abbreviated to CsPbBr 3 @SnO 2 NCs) has been reported for the first time by combining the water-triggered transformation of Cs 4 PbBr 6 NCs and the hydrolysis of tin 2-ethylhexanoate. Owing to the construction of the CsPbBr 3 /SnO 2 heterojunction, the recombination rate of carriers in the CsPbBr 3 @SnO 2 NCs is greatly reduced compared to that of the pristine CsPbBr 3 NCs. The stability against water degradation is also improved due to the protection of the SnO 2 coating. Accordingly, a CsPbBr 3 @SnO 2 -graphene hybrid device for high-performance photodetection is demonstrated. Results show that the responsivity of the device reaches 6.2 × $\ \ensuremath{\times{}}$ 10 4 A W −1 at 1 V, which is over 496-fold of the pristine CsPbBr 3 device. This work not only provides a robust approach for the surface modification of CsPbX 3 NCs but also offers useful guidance on the optoelectronic applications with CsPbX 3 NCs.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Jiejun Ren,Longyun Liu,Fan Liu,Huiping Liu,Xiaopeng Zhou,Gen Li,Liangjun Chen,Guoping Yan,Yuhua Wang
Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr 3 @CsPb 2 Br 5 @DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb 2 Br 5 shell is induced by the in-situ reconstruction of the CsPbBr 3 surface by water erosion, and the lattice mismatch with the CsPbBr 3 core is small (3.8%). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb 2 Br 5 @DSPE shell effectively passivates the surface of the CsPbBr 3 core, thus improving its stability and luminescence performance. The resulting CsPbBr 3 @CsPb 2 Br 5 @DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.
研究领域:
材料科学
·
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Ting Ding,Jin-Xiao Wang,Liang-Xing Zhang,Jin-Cheng Xu,Peng Xiao,Hua Xu,Shuang-Peng Wang,Kar Wei Ng
CsPbBr 3 nanoplates (NPs) have shown great potential in diverse optoelectronic applications. Despite the wonderful luminescence properties, the inherent instability of these NPs hinders their use in practical situations. Herein, a facile water-assisted strategy is reported to synthesize highly stable blue emission CsPbBr 3 NPs encapsulated in PbBr(OH). The introduction of water directly into the reaction mixture is pivotal, as it triggers the transformation of bulk CsPbBr 3 nanocubes into 2-D CsPbBr 3 NPs within the PbBr(OH) matrix, resulting in the formation of CsPbBr 3 @PbBr(OH) microbricks. Remarkably, the water content in the reaction mixture allows the control of the number of perovskite layers in the NPs, thus enabling the emission color to be tuned from deep blue to green. The unconventional approach presented herein not only offers a cost-effective pathway to synthesize blue-emitting perovskites which are highly stable in a wide variety of polar and non-polar solvents, but also holds immense potential for propelling the advancement of high-performance LEDs and other optoelectronic devices. The findings underscore the significance of water in dictating the growth dynamics and emission characteristics of perovskite NPs, paving the way for their practical application.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qianfeng Li,Jian Sun,Xupo Liu,Changling Yan,Gongke Wang
Ascorbic acid (AA), a crucial antioxidant, is integral to various physiological processes in the human body and is extensively utilized as an additive in the food industry due to its potent antioxidant capabilities. Accurate and sensitive detection of AA is therefore vital for both biomedical research and food safety. Nanomaterials, with their unique physicochemical properties, have become prominent in sensing applications. Among these, perovskite quantum dots (QDs) stand out as promising fluorescent sensors due to their high quantum yield, tunable optical properties, and broad application potential. However, the limited water solubility and stability of perovskite QDs in aqueous environments have been a significant challenge. To address these issues, we have developed an innovative fluorescent sensor that integrates water-stable perovskite QDs (CsPbBr 3 QDs) with hollow mesoporous manganese dioxide nanospheres (HMnO 2 NSs). This novel sensor capitalizes on the unique hollow structure and superior redox properties of HMnO 2 NSs. The sensing mechanism is based on the reduction of HMnO 2 NSs to Mn 2+ by AA, which then triggers the fluorescence recovery of the CsPbBr 3 QDs/HMnO 2 NSs system. This mechanism enables efficient and selective detection of AA. The proposed sensor exhibits exceptional sensitivity, and demonstrates excellent selectivity against potential interfering substances. This work presents a more efficient and straightforward method for detecting AA in complex biological and food samples, highlighting its promising potential in the fields of biomedical research and food safety.
研究领域:
生物医学研究
·
食品安全
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）