Surface recombination velocity of methylammonium lead bromide nanowires in anodic aluminium oxide templates

Khoram, Parisa; Oener, Sebastian Z.; Zhang, Qianpeng; Fan, Zhiyong; Garnett, Erik C.

doi:10.1039/c8me00035b

Cited by 7 publications

(9 citation statements)

References 49 publications

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“…3f). 33 Besides increasing the radiative recombination rate via quantum confinement and increasing the surface recombination rate, decreasing the NW diameter also is expected to increase the light outcoupling 34 . In order to quantify this, we simulated the light out-coupling efficiency of dipoles with different orientations and positions in the NW arrays as a function of diameter (Fig.…”

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confidence: 99%

“…15 Meanwhile, recently we have discovered that our PAMs provide excellent surface passivation to perovskite NWs, thus SRV is very low. 34 One may consider that smaller QW diameter leads to larger surface-to-volume ratio and more severe surface nonradiative recombination, as observed in some inorganic NWs. 35,36 However, smaller diameter NWs provided much stronger spacial confinement to the photogenerated excitons, as compared with larger diameter NWs.…”

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confidence: 99%

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Increasing Photoluminescence Quantum Yield by Nanophotonic Design of Quantum-Confined Halide Perovskite Nanowire Arrays

Zhang

et al. 2019

Nano Lett.

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High photoluminescence quantum yield (PLQY) is required to reach optimal performance in solar cells, lasers and light-emitting diodes. Typically, PLQY is increased by improving the material quality to reduce the non-radiative recombination rate. It is in principle equally effective to improve the optical design by nanostructuring a material to increase light outcoupling efficiency and introduce quantum confinement, both of which can increase the radiative recombination rate. However, increased surface recombination typically minimizes nanostructure gains in PLQY. Here we demonstrate that porous alumina membranes can be used to control the diameter of CH3NH3PbI3 nanowire arrays from the bulk (250 nm) to the quantum-confined regime (5.7 nm), while simultaneously providing a low surface recombination velocity of 18 cm/s. This enables the 54-fold increase in radiative recombination rate and 2.2-fold increase in light out-coupling efficiency to increase the PLQY by a factor of 130, from 0.33% up to 42.6%, exclusively using nanophotonic design. Photoluminescence quantum yield (PLQY) is defined as the fraction of absorbed photons that are converted to external emission. It is determined by the relative rates of radiative and non-radiative recombination and thus plays a key role in the performance of a wide variety of optoelectronic devices such as solar cells 1,2 , light-emitting diodes 3-5 and lasers 6. The common approach to

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Increasing Photoluminescence Quantum Yield by Nanophotonic Design of Quantum-Confined Halide Perovskite Nanowire Arrays

Zhang

et al. 2019

Nano Lett.

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“…The free-standing PAM was prepared by a two-step anodic anodization method, and the details can be found from our previous works. ,− Note that the PAM thickness was controlled by the second anodization time, and the PAM pore diameter was controlled by the second etch time. A 200 V anodization voltage was used to generate a pitch of 500 nm.…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Perovskite Nanophotonic Wire Array-Based Light-Emitting Diodes with Significantly Improved Efficiency and Stability

Zhang

et al. 2020

ACS Nano

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Hybrid perovskites have emerged as promising candidates for highly efficient light-emitting diodes in the past few years due to their excellent crystallinity, high color purity, wide-range bandgap tunability, and solution processability. However, the reported device external quantum efficiency has not reached the level on par with that of conventional inorganic and organic light-emitting diodes. Moreover, device stability still needs substantial improvement. In this work, we demonstrate the fabrication of perovskite nanophotonic wire array-based light-emitting diodes with a capillary-effect-assisted template method. Compared with the planar control device, the nanostructured device demonstrates 45% improvement of external quantum efficiency from 11% to 16% owing to substantial enhancement on device light extraction efficiency verified by optical modeling. Intriguingly, it is also discovered that the nanostructured device possesses 3.89 times lifetime compared to the planar control device, due to effective template passivation. The results here have clearly shown that with a proper photonic device structure design, both the device performance and lifetime can be significantly improved.

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“… 50 Lead halide perovskites are also a particularly appealing material for testing nanophotonic approaches since their low surface and interfacial recombination velocities allow for increased surface area with little increase in nonradiative recombination. 51 , 52 Their sensitivity to a variety of solvents and process steps normally used in lithography make traditional patterning more challenging, although their soft nature and low crystallization temperature also enable direct nanoimprint lithography. 53 − 57 For characterization, and for applications where high light intensity is required, such as lasing, 58 these lead halide perovskites are also generally more unstable than traditional materials used for photonic structures.…”

Section: Light Incoupling and Light Trappingmentioning

confidence: 99%

“…Even the strongly absorbing lead halide perovskites could benefit substantially from improving absorption near the bandgap, especially in tandem cells where there is no back reflector . Lead halide perovskites are also a particularly appealing material for testing nanophotonic approaches since their low surface and interfacial recombination velocities allow for increased surface area with little increase in nonradiative recombination. , Their sensitivity to a variety of solvents and process steps normally used in lithography make traditional patterning more challenging, although their soft nature and low crystallization temperature also enable direct nanoimprint lithography. − For characterization, and for applications where high light intensity is required, such as lasing, these lead halide perovskites are also generally more unstable than traditional materials used for photonic structures . We note that any of these tests of novel photonic structures for PV devices need to consider also how patterning and changes in the absorption and emission affect the electronic properties of the material and, ultimately, the quality of the PV devices.…”

Section: Light Incoupling and Light Trappingmentioning

confidence: 99%

Photonics for Photovoltaics: Advances and Opportunities

et al. 2020

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Photovoltaic systems have reached impressive efficiencies, with records in the range of 20–30% for single-junction cells based on many different materials, yet the fundamental Shockley-Queisser efficiency limit of 34% is still out of reach. Improved photonic design can help approach the efficiency limit by eliminating losses from incomplete absorption or nonradiative recombination. This Perspective reviews nanopatterning methods and metasurfaces for increased light incoupling and light trapping in light absorbers and describes nanophotonics opportunities to reduce carrier recombination and utilize spectral conversion. Beyond the state-of-the-art single junction cells, photonic design plays a crucial role in the next generation of photovoltaics, including tandem and self-adaptive solar cells, and to extend the applicability of solar cells in many different ways. We address the exciting research opportunities and challenges in photonic design principles and fabrication that will accelerate the massive upscaling and (invisible) integration of photovoltaics into every available surface.

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Surface recombination velocity of methylammonium lead bromide nanowires in anodic aluminium oxide templates

Abstract: Here we present successful surface passivation of halide perovskite nanowires with anodic aluminum oxide templates.

Cited by 7 publications

References 49 publications

Increasing Photoluminescence Quantum Yield by Nanophotonic Design of Quantum-Confined Halide Perovskite Nanowire Arrays

Increasing Photoluminescence Quantum Yield by Nanophotonic Design of Quantum-Confined Halide Perovskite Nanowire Arrays

Three-Dimensional Perovskite Nanophotonic Wire Array-Based Light-Emitting Diodes with Significantly Improved Efficiency and Stability

Photonics for Photovoltaics: Advances and Opportunities

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