- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Dye Engineered Perovskite Solar Cells under Accelerated Thermal Stress and Prolonged Light Exposure
摘要： Herein, the thermal and light stability enhancement of planar perovskite solar cells (PSCs) based on the approach of dye-sensitization of the titania compact layer with the triphenylamine-based metal-free organic (E)-3-(5-(4-(bis(2’,4’-dibutoxy-[1,1’-biphenyl]-4-yl) amino) phenyl) thiophen-2-yl)-2-cyanoacrylic acid (D35) dye is reported. The D35 molecule is chemically adsorbed via a bidentate anchor group upon the TiO2 underlayer. This enhances the power conversion efficiency of PSCs due to its well-established versatile role, offering facilitation of electron charge transfer to the anode while favoring the growth of robust and homogenous perovskite layers. However, its influence in the PSC performance seems to expand further. The stability experiments showed an enhanced endurance for the devices after the insertion of D35, not only in shelf-shield conditions but also after accelerated thermal tests and prolonged light exposure. This study confirms the plethoric role of dye sensitization strategy and its advantages to interfacial engineering via organic chromophores towards efficient and stable PSCs.
关键词： dyes/pigments,perovskite solar cells,titanium dioxide,perovskite phases,stability enhancement
更新于2025-09-23 15:19:57
-
Remarkable Oxygen-Evolution Activity of Ca2-xSrxFe2O6-δ
摘要： The unprecedented catalytic activity of an iron-based oxygen-deficient perovskite for oxygen-evolution reaction (OER) is reported, given the need for catalysts based on earth-abundant elements. In addition, systematic trends in oxygen-evolution activity as a function of composition, defect-order and electrical conductivity have been demonstrated, leading to a methodical increase in OER catalytic activity: Ca2Fe2O6-δ < CaSrFe2O6-δ < Sr2Fe2O6-δ. The latter material, which has the highest electrical conductivity and a unique type of defect-order, exhibits the best OER activity. In conventional experiments using glassy carbon electrode, this compound shows superior OER activity compared to the current state of the art catalysts, Ba0.5Sr0.5Co0.8Fe0.2O3?δ and RuO2. It also offers an additional advantage, namely high intrinsic electrical conductivity, which allows Sr2Fe2O6-δ to act as a catalyst without the need for glassy carbon electrode or carbon powder, that are frequently used for enhancing the charge transport in OER catalysts. Indeed, pure disks of this material exhibit an outstanding activity for OER, without any additives or need for electrode preparation.
关键词： oxygen-evolution reaction,perovskite phases,iron,defect-order,electrical conductivity
更新于2025-09-23 15:19:57
-
An All‐Inorganic Perovskite‐Phase Rubidium Lead Bromide Nanolaser
摘要： Rubidium lead halides (RbPbX3), an important class of all-inorganic metal halide perovskites, are attracting increasing attention for photovoltaic applications. However, limited by its lower Goldschmidt tolerance factor t (cid:2) 0.78, all-inorganic RbPbBr3 has not been reported. Now, the crystal structure, X-ray diffraction (XRD) pattern, and band structure of perovskite-phase RbPbBr3 has now been investigated. Perovskite-phase RbPbBr3 is unstable at room temperature and transforms to photoluminescence (PL)-inactive non-perovskite. The structural evolution and mechanism of the perovskite–non-perovskite phase transition were clarified in RbPbBr3. Experimentally, perovskite-phase RbPbBr3 was realized through a dual-source chemical vapor deposition and annealing process. These perovskite-phase microspheres showed strong PL emission at about 464 nm. This new perovskite can serve as a gain medium and microcavity to achieve broadband (475–540 nm) single-mode lasing with a high Q of about 2100.
关键词： rubidium lead bromide,nanolasers,all-inorganic perovskite phases
更新于2025-09-19 17:13:59
-
An All-Inorganic Perovskite-Phase Rubidium Lead Bromide Nanolaser
摘要： Rubidium lead halides (RbPbX3), an important class of all-inorganic metal halide perovskites, are attracting increasing attention for photovoltaic applications. However, limited by its lower Goldschmidt tolerance factor t (cid:2) 0.78, all-inorganic RbPbBr3 has not been reported. Now, the crystal structure, X-ray diffraction (XRD) pattern, and band structure of perovskite-phase RbPbBr3 has now been investigated. Perovskite-phase RbPbBr3 is unstable at room temperature and transforms to photoluminescence (PL)-inactive non-perovskite. The structural evolution and mechanism of the perovskite–non-perovskite phase transition were clarified in RbPbBr3. Experimentally, perovskite-phase RbPbBr3 was realized through a dual-source chemical vapor deposition and annealing process. These perovskite-phase microspheres showed strong PL emission at about 464 nm. This new perovskite can serve as a gain medium and microcavity to achieve broadband (475–540 nm) single-mode lasing with a high Q of about 2100.
关键词： nanolasers,rubidium lead bromide,all-inorganic perovskite phases
更新于2025-09-11 14:15:04
-
Lead‐Free Semiconductors: Soft Chemistry, Dimensionality Control, and Manganese‐Doping of Germanium Halide Perovskites
摘要： Lead halide perovskites have drawn enormous interest due to their exceptional photovoltaic and optoelectronic properties. However, the toxic heavy metal lead is harmful to humans and the environment resulting in a need for strategies to replace this toxic element. Herein, we report a facile aqueous synthesis of CsGeX3 (X = I, Br) perovskite nanocrystals with size control achieved by varying the cysteammonium halide ligand concentration. We observe a variety of morphologies including pyramidal, hexagonal, and spheroidal. CsGeX3 nanocrystals undergo a lattice expansion due to partial replacement of Cs+ with larger cysteNH3+ cations into the lattice. We successfully dope Mn2+ into the CsGeX3 lattice for the first time with incorporation up to 29% in bulk and 16% in nano samples. XRD peak shifts and EPR hyperfine splitting strongly indicate that Mn2+ is doped into the lattice. Our results introduce a new member to the lead-free halide perovskite family and set the fundamental stage for their use in optoelectronic devices.
关键词： Germanium Halide Perovskites,Manganese(II) Doping,Perovskite Phases,Lead Substitution,Perovskite Nanocrystals
更新于2025-09-09 09:28:46
-
Low‐dimensional hybrid perovskites containing an organic cation with an extended conjugated system: tuning the excitonic absorption features
摘要： Low-dimensional hybrid perovskites are receiving increased attention. One of the advantages of the low dimensional hybrids over their 3D counterparts is their greater structural flexibility towards the incorporation of bigger, more complex, organic cations. In this communication, we introduce a pyrene derivative as an organic cation containing an extended π-system for use in a variety of low dimensional hybrids. We show that materials with different excitonic absorption features can be obtained by tuning the iodide/lead ratio in the precursor solutions, using the same pyrene cation. In this way, hybrids with optical characteristics corresponding to 2D, 1D and 0D hybrid perovskites are obtained. The formation and thermal stability of the different hybrids is analysed and compared.
关键词： excitons,stability,organic-inorganic hybrid composites,low-dimensional,perovskite phases
更新于2025-09-04 15:30:14