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- 2018
- Inorganic perovskite quantum dots
- Stability
- Light-emitting diodes
- Optoelectronic Information Materials and Devices
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Lanthanide-based Nanocomposites for Photothermal Therapy under Near Infrared Laser: Relationship between Light and Heat, Bio-stability and Reaction Temperature
摘要： In this research, typical organic/inorganic photothermal therapy (PTT) agents were designed with combination of up-conversion luminescent (UCL) or NIR II imaging rare earth nanomaterials for photoacoustic (PA)/UCL/NIR II imaging-guided PTT under NIR laser irradiation. The results show that: (1) PTT effect mainly comes from NIR absorption and partly from the UCL light conversion. (2) The visible UCL emission is mainly quenched by the NIR absorption of the coated PTT agent and partly quenched by the visible absorption, indicating the excitation may play a more important role than in the UCL emission process. (3) The bio-stability of the composite might be decided by the synthesized reaction temperature. Among the five inorganic/organic nanocomposite, UCNP@MnO2 is the most suitable candidate for cancer diagnosis and treatment due to its stimuli-response ability to the micro-acid environment of tumor cells and highest bio-stability. The composites generate heat for PTT after entering the tumour cells, and then the visible light emission gradually regains as MnO2 is reduced to colorless Mn2+ ions, thereby illuminating the cancer cells after the therapy.
关键词： Photothermal therapy,Upconversion luminescence imaging,Mito-tracker,Photoacoustic imaging,Inorganic/organic nanocomposite
更新于2025-09-23 15:19:57
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Inorganic halide double perovskites with optoelectronic properties modulated by sublattice mixing
摘要： All-inorganic halide double perovskites have emerged as a promising class of materials that are potentially more stable and less toxic than lead-containing hybrid organic-inorganic perovskite optoelectronic materials. In this work, 311 cesium chloride double perovskites (Cs2BB’Cl6) were selected from a set of 903 compounds as likely being stable based on a statistically learned tolerance factor (t) for perovskite stability. First-principles calculations on these 311 double perovskites were then performed to assess their stability and identify candidates with band gaps appropriate for optoelectronic applications. We predict that 261 of the 311 Cs2BB’Cl6 compounds are likely synthesizable based on a thermodynamic analysis of their decomposition to competing compounds (decomposition enthalpy < 0.05 eV/atom). Of these 261 likely synthesizable compounds, 47 contain no toxic elements and have direct or nearly direct (within 100 meV) band gaps between 1 and 3 eV as computed with hybrid density functional theory (HSE06). Within this set, we identify the triple alkali perovskites Cs2[Alk]+[TM]3+Cl6, where Alk is a group 1 alkali cation and TM is a transition metal cation, as a class of Cs2BB’Cl6 double perovskites with remarkable optical properties, including large and tunable exciton binding energies as computed by the GW-Bethe Salpeter Equation (GW-BSE) method. We attribute the unusual electronic structure of these compounds to the mixing of the Alk-Cl and TM-Cl sublattices, leading to materials with small band gaps, large exciton binding energies, and absorption spectra that are strongly influenced by the identity of the transition metal. The role of the double perovskite structure in enabling these unique properties is probed through analysis of the electronic structures and chemical bonding of these compounds as compared with other transition metal and alkali transition metal halides.
关键词： stability,sublattice mixing,band gaps,inorganic halide double perovskites,optoelectronic properties,excitons
更新于2025-09-23 15:19:57
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Inorganic Halide Perovskite Solar Cells: Progress and Challenges
摘要： All-inorganic perovskite semiconductors have recently drawn increasing attention owing to their outstanding thermal stability. Although all-inorganic perovskite solar cells (PSCs) have achieved significant progress in recent years, they still fall behind their prototype organic–inorganic counterparts owing to severe energy losses. Therefore, there is considerable interest in further improving the performance of all-inorganic PSCs by synergic optimization of perovskite films and device interfaces. This review article provides an overview of recent progress in inorganic PSCs in terms of lead-based and lead-free composition. The physical properties of all-inorganic perovskite semiconductors as well as the hole/electron transporting materials are discussed to unveil the important role of composition engineering and interface modification. Finally, a discussion of the prospects and challenges for all-inorganic PSCs in the near future is presented.
关键词： perovskites,inorganic perovskite,lead-based,perovskite solar cells,lead-free perovskites
更新于2025-09-23 15:19:57
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Quasi-Vertically-Orientated Antimony Sulfide Inorganic Thin-Film Solar Cells Achieved by Vapor Transport Deposition
摘要： The one-dimensional photovoltaic absorber material Sb2S3 requires crystal orientation engineering to enable efficient carrier transport. In this work, we adopted a vapor transport deposition (VTD) method to fabricate vertically aligned Sb2S3 on a CdS buffer layer. Our work shows that such a preferential vertical orientation arises from the sulfur deficit of the CdS surface which creates a beneficial bonding environment between exposed Cd2+ dangling bonds and S atoms in the Sb2S3 molecules. The CdS/VTD-Sb2S3 interface recombination is suppressed by such properly aligned ribbons at the interface. Compared with typical [120]-oriented Sb2S3 films deposited on CdS by rapid thermal evaporation (RTE) method, the VTD-Sb2S3 thin film is highly [211]- and [121]- oriented and the performance of the solar cell is increased considerably. Without using any hole transportation layer, a conversion efficiency of 4.73% is achieved with device structure of ITO/CdS/Sb2S3/Au. This work provides a potential way to acquire vertical aligned thin films on different buffer layers.
关键词： inorganic device,Sb2S3 solar cell,Vapor transport deposition,thin film,vertical growth
更新于2025-09-23 15:19:57
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Improved Efficiency of All-Inorganic Quantum-Dot Light-Emitting Diodes via Interface Engineering
摘要： As the charge transport layer of quantum dot (QD) light-emitting diodes (QLEDs), metal oxides are expected to be more stable compared with organic materials. However, the efficiency of metal oxide-based all-inorganic QLEDs is still far behind that of organic–inorganic hybrid ones. The main reason is the strong interaction between metal oxide and QDs leading to the emission quenching of QDs. Here, we demonstrated nickel oxide (NiOx)-based all-inorganic QLEDs with a maximum current efficiency of 20.4 cd A?1 and external quantum efficiency (EQE) of 5.5%, which is among the most efficient all-inorganic QLEDs. The high efficiency is mainly attributed to the aluminum oxide (Al2O3) deposited at the NiOx/QDs interface to suppress the strong quenching effect of NiOx on the QD emission, together with the molybdenum oxide (MoOx) that reduced the leakage current and facilitated hole injection, more than 300% enhancement was achieved compared with the pristine NiOx-based QLEDs. Our study confirmed the effect of decorating the NiOx/QDs interface on the performance enhancement of the all-inorganic QLEDs.
关键词： all-inorganic,high efficiency,NiOx,light-emitting devices,quantum dots
更新于2025-09-23 15:19:57
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High-Performance UVa??Vis Photodetectors Based on a Lead-Free Hybrid Perovskite Crystal (MV)[SbI <sub/>3</sub> Cl <sub/>2</sub> ]
摘要： Low-dimensional lead-free organic?inorganic hybrid perovskites have gained increasing attention as having low toxicity, ease of processing, and good optoelectronic properties. Seeking for lead-free and narrow band gap organic?inorganic hybrid perovskites are of great importance for the development and application of photoelectric materials. Here, we reported a Sb-based organic?inorganic hybrid perovskite (MV)[SbI3Cl2], which has one-dimensional inorganic frameworks of the I-sharing double octahedra. (MV)[SbI3Cl2] shows a narrow direct band gap of 1.5 eV, and displays obvious photoresponse for the 532 nm light with rapid response speed of trise = 0.69 s, tdecay = 0.28 s. With an illumination power of 5 mW and a 50 V bias, the responsivities (R) and external quantum e?ciency (EQE) for (MV)[SbI3Cl2] photodetector under 532 nm laser are 29.75 mA/W and 6.69% respectively. This Sb-based halide double perovskite material will provide an alternative material for photodetector devices.
关键词： organic?inorganic hybrid perovskites,Sb-based,narrow band gap,photodetectors,lead-free
更新于2025-09-23 15:19:57
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A Comparative Study on the Photovoltaic Properties of ZnX (X=S, Se, Te) QD/CNT Inorganic/Organic Hybrid Nanocomposites
摘要： Designing the efficient inorganic/organic hybrid light harvesting systems through understanding of charge generation, separation and recombination dynamics is an important pathway for improvement of power conversion efficiency (PCE) of photovoltaic cell. Using density functional method, we explored the photovoltaic performance of recently synthesized ZnX (X=S, Se, Te) QD/carbon nanotube (CNT) nanocomposites. Interestingly, ZnX QD/CNT nanocomposites exhibit type-II band alignment, where hole and electron charge carriers are localized on ZnX QD and CNT, respectively. However, the energy difference between highest occupied molecular orbital of ZnXQD and conduction band minimum of CNT is very small (0.09-0.26 eV), implying huge possibilities of electron-hole recombination at ZnX:CNT interface. To overcome such unpleasant situation, we focus on chemical modification of CNT. The CNT is hydrogenated by attachment of atomic hydrogen and next the hydrogenated CNT is functionalized by electron withdrawing group (-CN) in part. We found that ZnX QD and CN functionalized hydrogenated CNT nanocomposites exhibit intended type-II band alignment and achieve high PCEs in the range of 6.73-8.38%, making them exceptionally competitive with other previously reported hybrid solar cells.
关键词： inorganic/organic hybrid nanocomposites,power conversion efficiency,ZnX QD/CNT,type-II band alignment,photovoltaic properties
更新于2025-09-23 15:19:57
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Lead (II) Propionate Additive and A Dopant-Free Polymer HTM for CsPbI2Br Perovskite Solar Cells
摘要： All-inorganic perovskites (CsPbI3 and CsPbI2Br), owing to their greater thermal stability compared to organic-inorganic hybrid perovskites, are becoming popular in perovskite photovoltaics but the problem that remains with CsPbI2Br (or CsPbI3) is the humidity-assisted phase transformation. Herein, we report about the formation of CsPbI2Br α-phase and improvement of its phase stability under ambient atmosphere (20-30 % relative humidity) by Pb (II) propionate additive in the CsPbI2Br precursor. Solar cells employing CsPbI2Br film with an optimum concentration of the additive (1 mol %), and a donor-acceptor type polymer (synthesized by us) as dopant-free hole transport material that has a better energy level matching with CsPbI2Br (compared to other polymers like P3HT, PTAA, asy-PBTBDT) work with a champion power conversion cell efficiency of 14.58 %. A continuous increase in the open-circuit voltage, reaching 1.36 V for 5 mol % of Pb (II) propionate manifests a remarkable defects-passivation effect by the additive.
关键词： Pb (II) propionate,All-inorganic perovskites,dopant-free hole transport material,solar cells,CsPbI2Br
更新于2025-09-23 15:19:57
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Boosting the photocatalytic performances of covalent organic frameworks enabled by spatial modulation of plasmonic nanocrystals
摘要： Plasmonic Au nanocrystals (NCs) are incorporated into covalent organic frameworks (COFs) with precisely modulated distributions to improve the efficiency of electron-hole separation covalent reactions and assembly of NCs, sparsely dispersed Au NCs (AuSP/COFs) or the close packed ones (AuCP/COFs) in COFs are fabricated, in which the contributions of electron acceptors/cocatalysts on the catalytic properties of Au/COFs composites are addressed by EPR, PL, phenacyl bromide (conversion >99%, selectivity of acetophenone ~92.8%) under visible light irradiation, which are associated with accelerated electron transfer, increased available Au/COFs and optimize the charge-carrier utilization. Specifically, through balancing the rate of dynamic Schottky junctions and boosted interfacial reaction kinetics. Overall, this work contributes to the fundamental understanding of the how spatial distributions of NCs in COFs affect the photocatalytic performances.
关键词： metallic nanocrystals,heterojunctions,covalent organic frameworks,photocatalysis,inorganic/organic hybrids
更新于2025-09-23 15:19:57
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Organic-inorganic hybrid heterostructures towards long-wavelength photodetectors based on InGaZnO-Polymer
摘要： Organic-inorganic hybrid heterostructures have attracted considerable attentions due to their wide application in electronics and optoelectronics. In this study, a high-performance red light photodetector based on organic-inorganic heterostructure was successfully fabricated after a systematical optimization in material and device constitution. The conjugated polymer (P(PDI-BDT-O)) with narrow band gap used as light absorber was combined with a layer of indium gallium zinc oxide (IGZO) to construct a bi-layered phototransistor achieving a high mobility as well as high photoresponsivity. Benefiting from both the high absorption coefficient of the polymer over a wide range of wavelength and the perfect matching of band level between polymer and IGZO, the device exhibits an ultrahigh photoresponsivity (212 A/W) and specfic detectivity (2 ? 1012 Jones) for red light at the wavelength of 633 nm. These results demonstrate the great potential of organic-inorganic heterostructures in the application of long-wavelength photodetectors.
关键词： Conjugated polymer,Oxide semiconductor,Organic-inorganic heterostructures,Red light photodetector
更新于2025-09-23 15:19:57