Quantum dot–induced phase stabilization of α-CsPbI
            <sub>3</sub>
            perovskite for high-efficiency photovoltaics

Swarnkar, Abhishek; Marshall, Ashley R.; Sanehira, Erin M.; Chernomordik, Boris D.; Moore, David T.; Christians, Jeffrey A.; Chakrabarti, Tamoghna; Luther, Joseph M.

doi:10.1126/science.aag2700

Cited by 2,415 publications

(2,892 citation statements)

References 37 publications

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“…The same group again demonstrated the development of room temperature stable cubic-phase QDs of CsPbI 3 , which are stable in bulk at high temperature. [66] In this work, an improved synthetic route and purification technique are proposed to prevent the CsPbI 3 colloidal QDs from transforming from the cubic to orthorhombic phase by using antisolvent methyl acetate to eliminate residue unreacted precursor without prompting any agglomeration; this leads to stable cubic CsPbI 3 QDs.…”

Section: D Perovskite: Quantum Dots (Qds)mentioning

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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Section: D Perovskite: Quantum Dots (Qds)mentioning

confidence: 99%

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

Yusoff

Nazeeruddin

2017

Advanced Energy Materials

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“…1 This structure leads to large open-circuit voltages (>1 V) and thus to high power conversion efficiencies. 2 Improved efficiencies of around 20 % for hybrid perovskites 3 and above 13% for perovskite quantum dot-based devices 4 , 5 have been reported so far. The idea of using these defect-tolerant lead halide-based perovskite nanocrystals for designing high-efficiency light-emitting devices was later proposed by the Kovalenko group.…”

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confidence: 99%

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Mir

Livache

Goubet

et al. 2018

Applied Physics Letters

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We discuss the transport properties of CsPbBrxI3−x perovskite nanocrystal arrays as a model ensemble system of caesium lead halide-based perovskite nanocrystal arrays. While this material is very promising for the design of light emitting diodes, laser, and solar cells, very little work has been devoted to the basic understanding of their (photo)conductive properties in an ensemble system. By combining DC and time-resolved photocurrent measurements, we demonstrate fast photodetection with time response below 2 ns. The photocurrent generation in perovskite nanocrystal-based arrays is limited by fast bimolecular recombination of the material, which limits the lifetime of the photogenerated electron-hole pairs. We propose to use nanotrench electrodes as a strategy to ensure that the device size fits within the obtained diffusion length of the material in order to boost the transport efficiency and thus observe an enhancement of the photoresponse by a factor of 1000.

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“…Concerns about this stability issue have stimulated research motivation for all‐inorganic perovskites. Since 2015, high‐performance cesium lead halide (CLH) perovskite‐based solar cells have begun to be reported 20, 21, 22, 23, 24, 25, 26, 27, 28, 29. Tailored composition and additive studies have led to a high photovoltaic efficiency as well as improved structural stability.…”

Section: Introductionmentioning

confidence: 99%

Methodologies toward Efficient and Stable Cesium Lead Halide Perovskite‐Based Solar Cells

et al. 2018

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In an attempt to replace thermally vulnerable organic perovskites, considerable research effort has recently been focused on the development of all‐inorganic perovskites in the field of photovoltaics. The preceding studies demonstrated that cesium lead halide perovskites are promising candidates for thermally stable and efficient solar cell materials. Here, the recent progress in cesium lead halide perovskite‐based solar cells is summarized. Whether organic cations are essential for the superiority of halide perovskites is controversial. However, more than 13% efficient solar cells have been successfully fabricated by employing cesium lead halide perovskites in a short amount of time. The state‐of‐the‐art materials engineering techniques will help to achieve a remarkable photovoltaic performance comparable to that of organic perovskites. In addition, improved understanding of the intrinsic photophysical behaviors will provide new insights that will facilitate further improvements in solar cell applications.

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Quantum dot–induced phase stabilization of α-CsPbI ₃ perovskite for high-efficiency photovoltaics

Cited by 2,415 publications

References 37 publications

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

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

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Methodologies toward Efficient and Stable Cesium Lead Halide Perovskite‐Based Solar Cells

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Quantum dot–induced phase stabilization of α-CsPbI 3 perovskite for high-efficiency photovoltaics

Cited by 2,415 publications

References 37 publications

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

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

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Methodologies toward Efficient and Stable Cesium Lead Halide Perovskite‐Based Solar Cells

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Quantum dot–induced phase stabilization of α-CsPbI ₃ perovskite for high-efficiency photovoltaics