Cesium lead mixed-halide perovskites in polymer matrix

Pushkarev, Anatoly P.; Korolev, Viacheslav I.; Anoshkin, Sergey; Komissarenko, Filipp; Makarov, Sergey; Zakhidov, Anvar A.

doi:10.1088/1742-6596/1092/1/012122

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Therefore, the experiments were conducted in harsh conditions: the light from a continuous wave UV lamp was focused on the sample to reach P = 5 W·cm

. As a result, the films 1 – 3 illuminated for 1000 s do not show any PL spectra shift ( Figure 2 d) that differs from the rapid segregation in polymer-free CsPb(Cl,Br)

films [ 8 , 38 ]. These outcomes also confirm the passivation of SHVs since the latter assist the high-mobility ionic migration and accelerate segregation [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

et al. 2020

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Inexpensive perovskite light-emitting devices fabricated by a simple wet chemical approach have recently demonstrated very prospective characteristics such as narrowband emission, low turn-on bias, high brightness, and high external quantum efficiency of electroluminescence, and have presented a good alternative to well-established technology of epitaxially grown III-V semiconducting alloys. Engineering of highly efficient perovskite light-emitting devices emitting green, red, and near-infrared light has been demonstrated in numerous reports and has faced no major fundamental limitations. On the contrary, the devices emitting blue light, in particular, based on 3D mixed-halide perovskites, suffer from electric field-induced phase separation (segregation). This crystal lattice defect-mediated phenomenon results in an undesirable color change of electroluminescence. Here we report a novel approach towards the suppression of the segregation in single-layer perovskite light-emitting electrochemical cells. Co-crystallization of direct band gap CsPb(Cl,Br)3 and indirect band gap Cs4Pb(Cl,Br)6 phases in the presence of poly(ethylene oxide) during a thin film deposition affords passivation of surface defect states and an increase in the density of photoexcited charge carriers in CsPb(Cl,Br)3 grains. Furthermore, the hexahalide phase prevents the dissociation of the emissive grains in the strong electric field during the device operation. Entirely resistant to 5.7 × 106 V·m−1 electric field-driven segregation light-emitting electrochemical cell exhibits stable emission at wavelength 479 nm with maximum external quantum efficiency 0.7%, maximum brightness 47 cd·m−2, and turn-on bias of 2.5 V.

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“…Therefore, the experiments were conducted in harsh conditions: the light from a continuous wave UV lamp was focused on the sample to reach P = 5 W·cm

. As a result, the films 1 – 3 illuminated for 1000 s do not show any PL spectra shift ( Figure 2 d) that differs from the rapid segregation in polymer-free CsPb(Cl,Br)

films [ 8 , 38 ]. These outcomes also confirm the passivation of SHVs since the latter assist the high-mobility ionic migration and accelerate segregation [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

et al. 2020

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“…[ 23,24 ] Less extensively studied is halide exchange in presynthesized polycrystalline films, where prior methods have come at the cost of a large surface roughness and poor optoelectronic properties. [ 25,26 ]…”

Section: Figurementioning

confidence: 99%

Deep‐Blue Perovskite Single‐Mode Lasing through Efficient Vapor‐Assisted Chlorination

et al. 2020

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Metal halide perovskites have emerged as promising candidates for solution‐processed laser gain materials, with impressive performance in the green and red spectral regions. Despite exciting progress, deep‐blue—an important wavelength for laser applications—remains underexplored; indeed, cavity integration and single‐mode lasing from large‐bandgap perovskites have yet to be achieved. Here, a vapor‐assisted chlorination strategy that enables synthesis of low‐dimensional CsPbCl3 thin films exhibiting deep‐blue emission is reported. Using this approach, high‐quality perovskite thin films having a low surface roughness (RMS ≈ 1.3 nm) and efficient charge transfer properties are achieved. These enable us to document low‐threshold amplified spontaneous emission. Levering the high quality of the gain medium, vertical‐cavity surface‐emitting lasers with a low lasing threshold of 6.5 µJ cm−2 are fabricated. This report of deep‐blue perovskite single‐mode lasing showcases the prospect of increasing the range of deep‐blue laser sources.

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“…[ 83 ] In contrast, passivation of CsPbBr 2 Cl grains with PEO suppresses this undesirable for stable monochromatic light sources effect. [ 84 ] Although anionic exchange between CsPbBr 3 :PEO and hydrogen chloride vapor can yield any CsPbBr 3− x Cl x :PEO composite emitting blue light for the fabrication of PeLECs, this approach seems to be applicable only to thin films deposited onto acid‐resistive bottom electrodes (for instance, CNT or graphene). Moreover, porous CNT is preferable, since HCl vapor can penetrate into the perovskite:PEO composite film through the pores of the CNT electrode (as sketched in Figure 4d) and thus tune the color of a PS‐LEC post‐assembly.…”

Section: External Ions In Single‐layer Pelecsmentioning

confidence: 99%

Reconfigurable Perovskite LEC: Effects of Ionic Additives and Dual Function Devices

Gets

Alahbakhshi

Mishra

et al. 2020

Advanced Optical Materials

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Hybrid organic–inorganic perovskite light‐emitting devices (LEDs) have recently shown the characteristic dynamical behavior of light‐emitting electrochemical cells (LECs), with intrinsic ionic migration creating an electric double layer and internal p‐i‐n structure and by accumulation of ions at interfaces. Therefore, the development of perovskite light‐emitting and photovoltaic devices based on the concepts of LEC operation attracts much attention and clarifies general physical processes in perovskites. Here, new directions that can further improve perovskite optoelectronic devices and extend their functionalities using additive mobile ions are overviewed: 1) enhancing single‐layer LECs with lithium additives for increased efficiency and longer lifetime; 2) facilitating ionic motion in three‐layer perovskite LECs to create dual‐functional devices, operating as both LEC and solar cells; and 3) creating truly ambipolar LEC devices with carbon nanotubes as stable electrodes that leverage ionic doping. Taken together, the use of these approaches provides a strategy to create efficient, stable, and bright LECs, which use advantages of both LED and LEC operation. It is discussed that how the LEC behavior in perovskite LEDs can be further improved to address the long‐term challenges in perovskite optoelectronics, such as stability, through approaches like ionically reconfigurable host/guest systems.

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Cesium lead mixed-halide perovskites in polymer matrix

Cited by 3 publications

References 8 publications

Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

Deep‐Blue Perovskite Single‐Mode Lasing through Efficient Vapor‐Assisted Chlorination

Reconfigurable Perovskite LEC: Effects of Ionic Additives and Dual Function Devices

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