Journal of Physical Chemistry C
·
2025
·
IF 3.2
Yi Wu,Zhangwei Guo,Zhuolu Li,Song Wang,Jiaxin Rui,Zhaogang Teng,Lihong Qi,Kai Pan
Metal halide perovskites (MHPs) have emerged as prominent materials in optoelectronics due to their exceptional photoelectric conversion efficiency and tunable band structures. Traditional perovskite nanocrystal synthesis systems often employ oleic acid (OA) to accelerate the crystallization kinetics, which inadvertently hinders nanowire growth and morphology control. In this study, we adopted a dual-ligand system using oleylamine (OAm) and octylamine (OctAm) without preadding OA. By postinjecting a cesium oleate solution, we achieved precise control over Pb2+ ion release, enabling the controllable synthesis of cesium lead halide (CsPbBr3) nanowires (NWs) across 100–160 °C. This strategy yielded micrometer-scale NWs with tunable diameters (8.3–12.6 nm) and lengths reaching the microscale. Temperature-dependent optical studies revealed that elevated synthesis temperatures weakened quantum confinement effects, leading to systematic red-shifts in ultraviolet–visible (UV–vis) absorption (505–507 nm) and photoluminescence (PL) emission (516–518 nm) peaks. Concurrently, time-resolved PL measurements revealed a significant enhancement in carrier lifetime (24.72–91.99 ns), reflecting reduced nonradiative recombination pathways. Variable-temperature PL spectroscopy (80–300 K) demonstrates that CsPbBr3 NWs synthesized at 140 °C exhibit higher exciton binding energy (Eb = 44.7 meV) and enhanced exciton–phonon coupling strength (ΓOP = 46.48 meV) compared to samples prepared at 120 °C. These findings demonstrate that high-temperature synthesis confers superior thermal stability on CsPbBr3 NWs. Our work not only clarifies the critical role of amine ligands in modulating NW growth dynamics but also provides a robust framework for designing stable, high-performance, one-dimensional perovskite optoelectronic materials.
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Materials Today Physics
·
2025
·
IF 9.7
Shaojie Zheng,Beili Pang,Yili Liu,Junyang Ma,Jianguang Feng,Hongzhou Dong,Liyan Yu,Lifeng Dong
In this study, a novel bifunctional additive strategy was developed to enhance the performance of fully inorganic CsPbBr 3 perovskite solar cells. Propylene glycol methyl ether (PM) was employed as a single additive, and a hybrid additive was formed by combining PM with methyl benzoate (MB). The power conversion efficiency increased from 5.77 % to 8.63 % with PM alone, and further to 9.57 % with the PM–MB hybrid. These additives reduce uncoordinated Pb 2+ ions and passivate defects. Surface electrostatic potential calculations reveal that PM and MB contain functional groups with negative electrostatic potential, enabling them to anchor to the perovskite surface without inducing damage. Binding energy calculations and X-ray photoelectron spectroscopy showed a shift of Pb peaks to lower binding energies, indicating reduced uncoordinated Pb 2+ ions and enhanced defect passivation, which promote grain growth. Additionally, the ether and ester groups in PM and MB facilitate the extraction of residual N, N- dimethylformamide (DMF). Fourier-transform infrared spectroscopy confirmed the disappearance of DMF-related peaks after treatment, indicating effective solvent removal. Grazing-incidence X-ray diffraction further demonstrated enhanced grain size and orientation, reflecting reduced solvent-induced damage and improved film quality. As a result, unencapsulated devices retained over 90 % of their initial performance after 2500 h in air.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Youtong Liu,Linlin Guan,Fang Zhao,Yuhan Jiang,Lingmu Zeng,Luwei Yang,Xiaobin Luo,Yang Ren,Xiaowei Zhou,Zhu Liu
All-inorganic CsPbBr3 perovskite films (band gap: 2.33 eV) were fabricated via a two-step electrochemical deposition (ECD) approach with controlled alkali halide codoping (KBr/KCl). Structural and morphological analyses (X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM)) show that 0.5 mg/mL KBr doping suppresses CsPb2Br5 formation, refines the grain size, and smooths film surfaces, reducing the charge-transfer resistance and extending the carrier lifetime from 3 to 8.3 ns. Compared to the undoped control, these changes deliver more than a 2-fold improvement in power conversion efficiency (PCE), driven by enhanced short-circuit current (JSC) and open-circuit voltage (VOC). KCl doping at 0.3 mg/mL concentration reduces the defect density by about 23% and yields 50% efficiency improvement. These findings show that targeted doping during electrochemical deposition can tune defect-phase interactions in CsPbBr3 perovskite and offers a scalable way to optimize its device performance.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Ge Gao,Li Chen,Xingyu Pan,Dingyiran Wu,Dingkang Xiong,Liuting Chen,Bingsuo Zou
All-inorganic lead halide perovskite quantum dots (QDs) have emerged as promising materials for photodetection owing to their exceptional optoelectronic properties. However, solution-processed CsPbBr3 QD films suffer from severe carrier recombination losses and inefficient charge transport. Herein, we address these challenges through rational design of Type-II CsPbBr3/SnS2 nanohybrid heterostructures, where SnS2 nanoparticles serve as electron transport pathways. Systematic characterization reveals that the interfacial energy band alignment enables fast charge separation while suppressing radiative recombination compared to pristine CsPbBr3 QDs. Based on these advantages of the CsPbBr3/SnS2 heterostructure, we demonstrate a self-powered UV photodetector exhibiting high sensitivity with a detectable threshold as low as 0.06 mW cm−2 at zero bias. The optimized device exhibits a high responsivity of 142.5 mA W−1, a remarkable specific detectivity of 1.13 × 1013 Jones, an ultrafast response time of 4 ms and a linear dynamic range of 84.4 dB. The device also exhibits an ultralow dark current in the order of 10−11 A, enabling a light-to-dark current ratio of up to 16 522. These parameters surpass those of most previously reported perovskite QD-based photodetectors. This work provides a viable strategy for engineering perovskite heterostructures toward high-performance optoelectronics, particularly for UV monitoring and industrial process control systems requiring zero-power operation.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 5
·1628-1636
·
IF 6.177
Peng Gao,Peng Wang,Xiaolei Liu,Zihao Cui,Yaqiang Wu,Xiaohan Zhang,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Dry reforming of CH4 by photothermal catalysis is considered to be a promising approach to produce syngas. It can not only store useful chemical energy, but also consume CO2 and CH4 to mitigate the greenhouse effect. Herein, we anchor Ag/AgBr on CsPbBr3 through an in situ ion exchange route to construct a composite material, which exhibits an excellent photothermal synergistic effect in the dry reforming of CH4. The CO production rate of the 7 wt% Ag/AgBr/CsPbBr3 composite through photothermal catalysis is 456.15 μmol g−1 h−1, which is approximately 79 times and 195 times higher than that through pure thermal catalysis and pure photocatalysis, respectively. Moreover, the CO production rate of 7 wt% Ag/AgBr/CsPbBr3 is 7.25 times higher than that of pristine CsPbBr3. The mutual promotion of the thermochemical and photochemical processes significantly improves the energy utilization efficiency and reaction kinetics, leading to high photothermal catalytic efficiency. This work indicates that the inorganic halide perovskite shows excellent photothermal catalytic activity, and provides an alternative way to extend the application range of perovskite materials.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiufeng Song,Xuhai Liu,Dejian Yu,Chengxue Huo,Jianping Ji,Xiaoming Li,Shengli Zhang,Yousheng Zou,Gangyi Zhu,Yongjin Wang,Mingzai Wu,An Xie,Haibo Zeng
Transition metal dichalcogenides (TMDs) are promising candidates for flexible optoelectronic devices because of their special structures and excellent properties, but the low optical absorption of the ultrathin layers greatly limits the generation of photocarriers and restricts the performance. Here, we integrate all-inorganic perovskite CsPbBr3 nanosheets with MoS2 atomic layers and take the advantage of the large absorption coefficient and high quantum efficiency of the perovskites, to achieve excellent performance of the TMD-based photodetectors. Significantly, the interfacial charge transfer from the CsPbBr3 to the MoS2 layer has been evidenced by the observed photoluminescence quenching and shortened decay time of the hybrid MoS2/CsPbBr3. Resultantly, such a hybrid MoS2/CsPbBr3 photodetector exhibits a high photoresponsivity of 4.4 A/W, an external quantum efficiency of 302%, and a detectivity of 2.5 × 1010 Jones because of the high efficient photoexcited carrier separation at the interface of MoS2 and CsPbBr3. The photoresponsivity of this hybrid device presents an improvement of 3 orders of magnitude compared with that of a MoS2 device without CsPbBr3. The response time of the device is also shortened from 65.2 to 0.72 ms after coupling with MoS2 layers. The combination of the all-inorganic perovskite layer with high photon absorption and the carrier transport TMD layer may pave the way for novel high-performance optoelectronic devices.
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PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Zhenyao Liang,Liang Ni,Yang Zhang,Chen Yuan,Le Huang,Yibin Yang,Ye Xiao
The effects of elemental tellurium doping and decorating on the photoluminescence quantum yield (PL QY) and the environmental stability of the CsPbBr3 quantum dots (QDs) have been systematically studied. The PL spectra blue-shifts from 520 to 464 nm gradually with the increase in the amount of Te, and the full width at half-maximum (FWHM) increases from 20 to 62 nm and decreases to 27 nm accordingly. The morphology of the untreated samples has a rectangular shape with distinct boundaries, whereas the Te-doped samples have a semi-core–shell structure with partially coated CsPb2Br5 after tellurium doping. Furthermore, the apparent size of the nanocomposites increases to 20 nm, but the crystal size of the core decreases slightly according to the broadened peaks of X-ray diffraction (XRD). Further investigation by X-ray photoelectron spectroscopy shows that the binding energy of Pb–Br increases and Pb–Te bonds are formed in Te-doped samples, which can enhance the stability of QDs from the view of strengthening the chemical bonds and inhibiting the detaching behavior of bromine under moisture. At the nominal content of Pb/Te = 1:0.4, the thermal decomposition temperature of the QDs increases from 300 to 500 °C; the maximum of PL QY increases to 70% for the 1:0.4 sample and the relative PL peak intensity maintains 50% of the initial value after a 60 h aging simulation. Finally, the nanocomposite materials are fabricated into a white light-emitting device (WLED). Under the illumination of a commercial GaN chip, the device shows a good Commission Internationale de lEclairage (CIE) color coordination of (0.3291,0.3318).
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Wan,Ya-Yun Zhou,Long Yan,Binbin Su,Shi Ye
Cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite quantum dots (QDs) have been intriguing optoelectronic materials for applications in various devices owing to their superior electronic and optical properties. However, poor resistance to humidity and light irradiation impedes their promotion. Herein, bulk perovskite-type layered CsCa2Ta3O10 is exfoliated into two-dimensional (2D) negatively charged Ca2Ta3O10– (CTO) nanosheets as seeds to in situ synthesize and composite CsPbBr3. The as-synthesized CsPbBr3/CTO nanocomposites possess improved green emission with apparently prolonged decay time with reference to bare CsPbBr3 QDs. The decay time can retrieve to a normal state when the nanocomposites are treated with some water. It is found that the CTO acts as a defect to trap the bound exciton of the loaded CsPbBr3. Protons from water can preferably replace Cs+ at the interface of the nanocomposites, resulting in the separation of the nanosheets and CsPbBr3 and retrieving the decay time. X-ray photoelectron spectroscopy results also indicate the strong interaction between CsPbBr3 and CTO with reference to the physical mixing sample of bare CsPbBr3 QDs and CTO nanosheets. The decoration of ultrathin 2D charge-bearing oxide nanosheets on the QDs benefits significant improvements in humidity resistance and photostability performance in light-emitting diode devices. This research offers a distinct strategy to modify the surface of perovskite QDs.
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高影响因子
CURRENT APPLIED PHYSICS
·
2021
·
IF 2.48
Ning Liu,Fangtian You,Chao Ji,Hongkang Gong,Qi Song,Jiasen Li,Chunjun Liang,Zhiqun He
Perovskite light-emitting diodes (PeLEDs) prepared by the all-solution-process are gradually coming into view due to their low cost and flexible production process. However, the performance of CsPbBr 3 device is limited by the high non-radiative recombination losses due to incomplete surface coverage and grain defects. Here a quaternary ammonium salt, tetrabutylammonium hexafluorophosphate (TBA-PF 6 ) was simultaneously introduced into perovskite emission layers (CsPbBr 3 ) and electron transport layer (TPBi (1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl) benzene) dissolved in ethyl acetate). As a result, the morphology and luminescence of CsPbBr 3 films were improved, and the energy level of TPBi was more conducive to charge transport. Consequently, the maximum luminance and current efficiency of the modified green-emitting PeLEDs are improved. Furthermore, the optimized device had an operating life of more than 20 min at an initial luminance of 1230 cd/m 2 . This work provides a simple and easy method to be scaled up for the development of low-cost all-solution-processed PeLEDs.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 17
·4793-4799
·
IF 5.976
Yongfeng Liu,Xiaosheng Tang,Tao Zhu,Ming Deng,Iroegbu Paul Ikechukwu,Wei Huang,Guolu Yin,Yongzhong Bai,Dingrong Qu,Xianbin Huang,Feng Qiu
Pollution triggered by highly toxic heavy metal ions has become a worldwide issue of concern, and has aroused increasing research interest, but it is still a challenge to carry out its trace detection in the organic phase using inorganic fluorescent colloidal nanocrystals (NCs). Herein, we report fully inorganic CsPbBr3 perovskite quantum dots (PQDs), which were synthesized via a hot-injection method, as a fluorescent probe for the selective detection of copper ions in hexane. The photoluminescence (PL) intensity of CsPbBr3 PQDs is significantly quenched within several seconds after the addition of Cu2+ due to effective electron transfer from the PQDs to the added Cu2+, which is experimentally verified via analyzing absorption spectra and PL decay lifetime. The sensor, in turn-off mode, has a detection range from 0 to 100 nM with a limit of detection (LOD) as low as 0.1 nM, indicating great potential for practical applications. This study paves the way for PQD-based fluorescent probes for heavy metal detection in the organic phase.
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Coatings
·
2022
·Vol. 12
·期 4
·512
·
IF 3.236
Song Wang,Yan Xu,Renjie Chen,Mengmeng Zhu,Muyi Wang,Mengmeng Cao,Yunpeng Liu,Haojie Ding,Shulan Zhang,Jueyao Bai,Jun Ren,Tongtong Xuan,Huili Li
All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.
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高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Fangbao Wang,Ruichen Bai,Qihao Sun,Xin Liu,Yuanbo Cheng,Shouzhi Xi,Binbin Zhang,Menghua Zhu,Shuqing Jiang,Wanqi Jie,Yadong Xu
A CsPbBr3 single crystal exhibits great potentials in X-ray/gamma-ray spectroscopy and imaging. Here, an inverse temperature crystallization (ITC) method with modified precursor composition is proposed to prepare CsPbBr3 single crystals. The introduction of adduct PbBr2·2DMSO, synthesized by the antisolvent vapor-assisted crystallization method, in the precursor solution gives rise to superior crystallization with a lower impurity concentration and higher resistivity of 6.37 × 109 Ω·cm, as well as a higher hole mobility (50.7 cm2·V–1·s–1). Furthermore, a low dark current of 2.3 nA is obtained at a bias of −100 V based on an as-grown crystal with a thickness of 1 mm, according to the asymmetric Au/CsPbBr3/Sn structure. The resulting asymmetric planar detectors achieve the high peak-to-valley ratio pulse height spectra with an energy resolution of 7.66%, illuminated by an uncollimated 241Am@5.5 MeV α particle. Simultaneously, an energy resolution of 13.5% is realized when irradiated by a 59.5 keV 241Am γ-ray source at room temperature. The thermally stimulated current (TSC) spectra indicate that the density of deep energy-level trap is significantly reduced in the CsPbBr3 crystals grown by PbBr2·2DMSO-modified precursor solution, which is consistent with the high performance in radiation detection.
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