18041-25-3Relevant academic research and scientific papers
Revealing the Role of Tin(IV) Halides in the Anisotropic Growth of CsPbX3 Perovskite Nanoplates
Almeida, Diogo B.,Alo, Arthur,Bonato, Luiz G.,Galembeck, Fernando,Germino, José C.,Moral, Raphael F.,Nagamine, Gabriel,Nogueira, Ana Flávia,Padilha, Lázaro A.,Zagonel, Luiz F.,da Silva, Douglas S.
, p. 11501 - 11509 (2020)
CsPbX3 perovskite nanoplates (PNPLs) were formed in a synthesis driven by SnX4 (X=Cl, Br, I) salts. The role played by these hard Lewis acids in directing PNPL formation is addressed. Sn4+ disturbs the acid–base equilibrium of the system, increasing the protonation rate of oleylamine and inducing anisotropic growth of nanocrystals. Sn4+ cations influence the reaction dynamics owing to complexation with oleylamine molecules. By monitoring the photoluminescence excitation and photoluminescence (PL) spectra of the PNPLs grown at different temperatures, the influence of the thickness on their optical properties is mapped. Time-resolved and spectrally resolved PL for colloidal dispersions with different optical densities reveals that the dependence of the overall PL lifetime on the emission wavelength do not originate from energy transfer between PNPLs but from the contribution of PNPLs with distinct thickness, indicating that thicker PNPLs exhibit longer PL lifetimes.
Highly efficient and stable air-processed hole-transport-material free carbon based perovskite solar cells with caesium incorporation
Liu, Pei,Gong, Youning,Xiao, Yuqing,Su, Meng,Kong, Sen,Qi, Fei,Zhang, Huijie,Wang, Shaofu,Sun, Xiaohua,Wang, Changlei,Zhao, Xing-Zhong
, p. 218 - 221 (2019)
An inorganic caesium cation was incorporated into perovskite to improve the performance and stability of solar cells with a hole-transport-material free structure in ambient air. A triple cation device with a champion power conversion efficiency of over 15% was achieved, exhibiting superior thermal, long-term and operational stabilities.
Self-trap-state-adjustable photoluminescence of quasi-one-dimensional RbPbI3and Cs substitutional counterparts
Gao, Kaige,Jie, Wanqi,Wang, Fangbao,Xiao, Bao,Xu, Yadong,Zhang, Bin-Bin
, p. 12108 - 12112 (2020)
The “self-trap state” in low demensional halide perovskites usually induces highly efficient below-gap broadband luminescence, which makes them promising fluorescence emitting materials. However, the luminescence mechanism based on the “self-trap state” is not well understood as yet. In this work, solution-grown quasi-one-dimensional RbPbI3crystals reveal a large Stokes shift of ～0.57 eV, wide and strong luminescence, and a linear power-dependent luminescence, whose luminescence mechanism was attributed to the formation of a “self-trap state” in RbPbI3. Furthermore, Cs substitutional counterpart (RbxCs1?x)PbI3crystals were found to adjust the distortions of the PbI6octahedron and the self-trap-state-induced luminescence properties. Our work provides a new strategy to control the “self-trap-state”-induced luminescence in low demensional halide perovskite materials.
Energetics, Structures, and Phase Transitions of Cubic and Orthorhombic Cesium Lead Iodide (CsPbI3) Polymorphs
Wang, Bin,Novendra, Novendra,Navrotsky, Alexandra
, p. 14501 - 14504 (2019)
Cesium lead iodide (CsPbI3) perovskite has shown great potential as a light absorbing material for solar cell applications. Despite intense research leading to increasing power conversion efficiency, a major problem concerning CsPbI3 lies in the long term stability and interconversion between different CsPbI3 polymorphs, a subject barely studied from the thermodynamic perspective. We report the formation enthalpies of two CsPbI3 polymorphs, α and δCsPbI3, using a combination of room temperature solution calorimetry in dimethyl sulfoxide (DMSO) and differential scanning calorimetry. We show that both polymorphs are stable with respect to their binary halides and confirm that the α-phase is a high temperature polymorph, metastable under ambient conditions. This work sheds light on patterns in polymorphism, possible decomposition reactions, materials stability, and compatibility within halide perovskites and related systems. Thermodynamic instability near ambient temperature of functional perovskites may be a general phenomenon related to their vibrational density of states.
Polar Solvent Induced Lattice Distortion of Cubic CsPbI3 Nanocubes and Hierarchical Self-Assembly into Orthorhombic Single-Crystalline Nanowires
Sun, Jian-Kun,Huang, Sheng,Liu, Xiao-Zhi,Xu, Quan,Zhang, Qing-Hua,Jiang, Wen-Jie,Xue, Ding-Jiang,Xu, Jia-Chao,Ma, Jing-Yuan,Ding, Jie,Ge, Qian-Qing,Gu, Lin,Fang, Xiao-Hong,Zhong, Hai-Zheng,Hu, Jin-Song,Wan, Li-Jun
, p. 11705 - 11715 (2018)
Despite the recent surge of interest in inorganic lead halide perovskite nanocrystals, there are still significant gaps in their stability disturbance and the understanding of their destabilization, assembly, and growth processes. Here, we discover that p
Enhanced thermal stability of exciton recombination in CsPbI3 perovskite nanocrystals via zinc alloying
Wu, Ruirui,Wang, Qi,Yang, Sen,Wu, Lifang,Gong, Shunfa,Han, Qiuju,Wu, Wenzhi
, (2021)
In this work, the Pb2+ substitution with Zn2+ in CsPbI3 perovskite nanocrystals (PNCs) is partially achieved to improve the optoelectronic properties through temperature-pressure assisted crystallization approach. The spectral and dynamic exciton recombination for zinc alloyed CsPbI3 PNCs are probed with steady-state/time-resolved PL (TRPL), transient absorption (TA) techniques. Compared with pure CsPbI3 PNCs, PLQY can be boosted to 60% when incorporating the optimal amount of ZnI2 in the synthesis, and long-term thermal stability are obtained in a series of red-emitting alloyed CsPbI3 PNCs. Simultaneously, the change of exciton binding energy and average optical phonon energy indicate that weaker nonradiative transition for exciton recombination of zinc alloyed CsPbI3 PNCs than those of CsPbI3 PNCs. TRPL and TA spectroscopy are used to understand the photoinduced carrier relaxation processes. The carrier dynamics reveal that the coupling between Zn-induced lowest excited state and exciton trapping state is promoted in zinc alloyed CsPbI3 PNCs, which can significantly enhance the efficiency of excitonic recombination. The improved performance of PLQY and thermal stability makes these zinc alloyed CsPbI3 PNCs as appropriate perovskite materials for efficient optoelectronic devices.
Stable and Efficient Upconversion Single Red Emission from CsPbI3Perovskite Quantum Dots Triggered by Upconversion Nanoparticles
Zhu, Yongsheng,Zhao, Jun,Li, Xueguo,Xu, Xiumei,Huang, Jinshu,Ji, Xiaoxu,Yang, Gang,Pan, Gencai
, p. 2649 - 2655 (2021)
Here, composites including highly efficient inert shell-modified NaYF4:Yb/Tm@NaYF4 upconversion nanoparticles (UCNPs) and CsPbI3 perovskite quantum dots (PQDs) have been successfully synthesized by the assistance of (3-aminopropyl)triethoxysilane (APTES) as a precursor for a SiO2 matrix. UCNPs and CsPbI3 PQDs in this composite structure show excellent stability in ambient conditions. Importantly, the efficient UC emission of CsPbI3 PQDs was realized, which means that the single red emission of inert shell-modified UCNPs can be easily obtained by depending on these composite structures. Furthermore, the single red emission wavelength can be easily regulated from 705 to 625 nm by introducing appropriate proportion of Br- ions, which is very difficult to achieve for traditional UCNPs. Moreover, benefiting from the efficient downshifting (DS) red emission of CsPbI3 PQDs, the composites possess the dual-wavelength excitation characteristics. So, the excellent dual-mode anticounterfeiting application has been demonstrated. This work will provide a new idea for the development of perovskite-based multifunctional materials.
Bidentate Ligand-Passivated CsPbI3 Perovskite Nanocrystals for Stable Near-Unity Photoluminescence Quantum Yield and Efficient Red Light-Emitting Diodes
Pan, Jun,Shang, Yuequn,Yin, Jun,De Bastiani, Michele,Peng, Wei,Dursun, Ibrahim,Sinatra, Lutfan,El-Zohry, Ahmed M.,Hedhili, Mohamed N.,Emwas, Abdul-Hamid,Mohammed, Omar F.,Ning, Zhijun,Bakr, Osman M.
, p. 562 - 565 (2018)
Although halide perovskite nanocrystals (NCs) are promising materials for optoelectronic devices, they suffer severely from chemical and phase instabilities. Moreover, the common capping ligands like oleic acid and oleylamine that encapsulate the NCs will form an insulating layer, precluding their utility in optoelectronic devices. To overcome these limitations, we develop a postsynthesis passivation process for CsPbI3 NCs by using a bidentate ligand, namely 2,2′-iminodibenzoic acid. Our passivated NCs exhibit narrow red photoluminescence with exceptional quantum yield (close to unity) and substantially improved stability. The passivated NCs enabled us to realize red light-emitting diodes (LEDs) with 5.02% external quantum efficiency and 748 cd/m2 luminance, surpassing by far LEDs made from the nonpassivated NCs.
Enhanced efficiency and stability of perovskite solar cells by partial replacement of CH3NH3 + with inorganic Cs+ in CH3NH3PbI3 perovskite absorber layer
Imran, Muhammad,Saleem,Khan, Nawazish Ali,Kamboh, Afzal Hussain
, p. 1 - 11 (2019)
In this work, we have investigated the (MA)1?xCsxPbI3(MA = CH3NH3; x = 0–1) perovskite based solar cells. The x-ray diffraction analysis revealed that crystal structure of the material has been transf
Size- and Halide-Dependent Auger Recombination in Lead Halide Perovskite Nanocrystals
Ding, Tao,Li, Yulu,Lu, Xin,Luo, Xiao,Wu, Kaifeng
, p. 14292 - 14295 (2020)
Lead halide perovskite nanocrystals (NCs) hold strong promise for a variety of light-harvesting, emitting, and detecting applications, all of which, however, could be complicated by multicarrier Auger recombination. Therefore, complete documentation of the size- and composition-dependent Auger recombination rates of these NCs is highly desirable, as it can guide system design in many applications. Herein we report the synthesis and Auger measurements of monodisperse APbX3 (A=Cs and FA; X=Cl, Br, and I) NCs in an extensive size range (ca. 3–9 nm). The biexciton Auger lifetime of all the NCs scales linearly with the NC volume. The scaling coefficient is virtually independent of the cation but rather depends sensitively on the anion, and is 0.035, 0.085, and 0.142 ps nm?3 for Cl, Br, and I, respectively. In all of these nanocrystals the Auger recombination is much faster than in standard CdSe and PbSe NCs (ca. 1 ps nm?3).
