Carrier recombination dynamics in individual CdSe nanowires

Vietmeyer, Felix; Frantsuzov, Pavel A.; Jankó, Boldizsár; Kuno, Masaru

doi:10.1103/physrevb.83.115319

Cited by 62 publications

(107 citation statements)

References 44 publications

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“…Previous experiments on semiconductor nanowires have typically shown that the fluence dependence of the slow relaxation process is due to Auger recombination. 15,25,27,30 However, as we formerly observed for GaN NW ensembles, 19 we were unable to clearly fit our data with a standard expression for two-or-three carrier Auger recombination. 25,30 This could be due to the fact that we are probing localized defect states and not the extended states that are known to be influenced by Auger recombination, as shown in earlier studies.…”

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confidence: 56%

“…These issues can be overcome by performing ultrafast optical pump-probe measurements on single NWs, [20][21][22][23][24][25][26][27][28] which has provided much insight into their intrinsic properties. For example, ultrafast optical microscopy (UOM) experiments, which are essentially optical pump-probe experiments with microscopic spatial resolution, have been performed on single Si NWs, revealing the dependence of carrier dynamics on light polarization and excitation fluence 25 as well as the NW diameter.…”

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confidence: 99%

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Space-and-time-resolved spectroscopy of single GaN nanowires

Upadhya

Martinez

Wang

et al. 2015

Applied Physics Letters

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Gallium nitride nanowires have garnered much attention in recent years due to their attractive optical and electrical properties. An understanding of carrier transport, relaxation, and recombination in these quasi-one-dimensional nanosystems is therefore important in optimizing them for various applications. Here, we present ultrafast optical microscopic measurements on single GaN nanowires. Our experiments, performed while varying the light polarization, excitation fluence, and position, give insight into the mechanisms governing carrier dynamics in these nanosystems. V C 2015 AIP Publishing LLC. [http://dx.

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confidence: 56%

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confidence: 99%

Space-and-time-resolved spectroscopy of single GaN nanowires

Upadhya

Martinez

Wang

et al. 2015

Applied Physics Letters

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“…[37,[76][77][78][79][80] Due to the flexibility and ease of employing metal films as catalysts to initiate 1D crystal growth, various groups used chemical vapor deposition (CVD) to synthesize II-VI and III-V semiconductor NWs. [81][82][83][84][85] Despite its versatility, the CVD approach is undesirable for synthesising perovskite NWs due to the low growth temperature of perovskite. Therefore, using the facile solution processable approach to prepare lead halide perovskite is the most appealing approach available to date.…”

Section: D Perovskite: Nanowires and Nanorodsmentioning

confidence: 99%

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Yusoff

Nazeeruddin

2017

Advanced Energy Materials

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ruthenium molecular dye, wide absorption range, direct and tunable bandgaps, superior charge carrier mobility, and long carrier diffusion length. [6,[43][44][45] Although it has been synthesized for over 100 years, Mitzi et al. were the first to investigate the electrical properties of tin-based perovskite in 1994, [46] which was later used in numerous devices, including field effect transistors (FETs) and LEDs. [47][48][49] The attention toward metal halide perovskites sparked yet again in 2009, [42] and they were later named one of the most promising emerging technologies in 2016. In brief, metal halide perovskites can be divided into two types based on their crystal structure motif: (i) 3D-structured perovskite (AMX 3 ) and (ii) 2D-structured perovskite (A 2 MX 4 ). The structure of the perovskite could either be 2D or 3D, while the dimensions of the perovskite probably belong to 0D-3D. The term "perovskite" implies to the general class of materials derived from an elemental composition of AMX 3 and demonstrates the crystal structure of perovskite crystal CaTiO 3 , where the divalent metal M resides at the body center and surrounded by six X-anions located at the face centers in an octahedral cluster. The MX 6 in the octahedral cluster may form an extended 3D structure by all-corner-connected type with A-cation sitting at the center. It could also form a 2D perovskite when the 3D perovskite network is cut into one-layer-thick slices along the 〈100〉 direction and separates them apart. In principle, 2D perovskite is the easiest to synthesize because of its natural layered structure, which is held together by weak van der Waals forces. Dou et al. reported the large-scale synthesis of the monolayer (C 4 H 9 NH 3 ) 2 -PbBr 4 by a chemical method. [50] Along the same lines, several groups have prepared and characterized nanomaterials composed of various forms of perovskites. [51][52][53] Also, our group has recently successfully prepared a low-dimensional mixed 2D/3D perovskite using the protonated salt of amino valeric acid iodide (AVAI) as an organic precursor mixed with PbI 2 , in which a yellowish film was containing needle-like crystallite formed. [54] In this topical review, we present the latest advances in the synthesis of low-dimensional perovskites and the growth mechanism to develop a strategy to achieve best performing devices. Later, we focus the instability and a cost-effective solution to circumvent this problem, which is vital for the eventual deployment of perovskite solar cells to consumers market. We present an analysis of the origins for instability in perovskite solar cells, and present a summary of the main achievements and possible future developments of these low-dimensional perovskite. [2,55] Perovskite solar cells have been heralded as one of the most promising emerging technologies in 2016 because of the very high power conversion efficiency of 22% and the low cost of generating electricity compared to even fossil fuels. These are formed with various dimensionalities and can be fully mani...

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“…225 This is a well-established approach for characterizing complex, multiprocess recombination dynamics in bulk and nanostructured materials. 34,322,323 Experimental I em versus I exc along with results from the fitting routine are shown in Figure 31B. Individual trapped electron and continuum carrier concentrations at various I exc are displayed in Figure 31C.…”

Section: Recombination Mechanismsmentioning

confidence: 98%

Intriguing Optoelectronic Properties of Metal Halide Perovskites

2016

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A new chapter in the long and distinguished history of perovskites is being written with the breakthrough success of metal halide perovskites (MHPs) as solution-processed photovoltaic (PV) absorbers. The current surge in MHP research has largely arisen out of their rapid progress in PV devices; however, these materials are potentially suitable for a diverse array of optoelectronic applications. Like oxide perovskites, MHPs have ABX stoichiometry, where A and B are cations and X is a halide anion. Here, the underlying physical and photophysical properties of inorganic (A = inorganic) and hybrid organic-inorganic (A = organic) MHPs are reviewed with an eye toward their potential application in emerging optoelectronic technologies. Significant attention is given to the prototypical compound methylammonium lead iodide (CHNHPbI) due to the preponderance of experimental and theoretical studies surrounding this material. We also discuss other salient MHP systems, including 2-dimensional compounds, where relevant. More specifically, this review is a critical account of the interrelation between MHP electronic structure, absorption, emission, carrier dynamics and transport, and other relevant photophysical processes that have propelled these materials to the forefront of modern optoelectronics research.

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Carrier recombination dynamics in individual CdSe nanowires

Abstract: Carrier dynamics in single CdSe nanowires (NWs) have been studied using various

Cited by 62 publications

References 44 publications

Space-and-time-resolved spectroscopy of single GaN nanowires

Space-and-time-resolved spectroscopy of single GaN nanowires

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Intriguing Optoelectronic Properties of Metal Halide Perovskites

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