Efficient (&gt;20 %) and Stable All‐Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts

Yu, Bin; Shi, Jiangjian; Tan, Shan; Cui, Yuying; Zhao, Wenyan; Wu, Haiming; Luo, Yanghong; Li, Dongmei; Meng, Qingbo

doi:10.1002/anie.202102466

Cited by 199 publications

(187 citation statements)

References 48 publications

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“…Many passivation agents including phenyltrimethylammonium chloride, octylammonium iodides, ureaammonium thiocyanate, etc., have been developed to stabilize and passivate inorganic perovskites. [23][24][25] Crystal secondary growth has been widely utilized in hybrid perovskites to reduce the defects as well as to enhance the stability and optoelectrical performance. The most popular crystal secondary growth approach is the postsynthetic halide salt treatment, especially using the solution of Br salt for treatment.…”

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confidence: 99%

Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

et al. 2021

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In the past few years, inorganic CsPbI 3 perovskite has made significant progress on improving both phase stability and optoelectrical performance owing to tremendous research efforts and in-depth understanding, especially on the crystal phases of inorganic CsPbI 3 perovskite and the development of different passivation approaches. [12][13][14][15][16] Recently, more and more investigations on the deep-level physical mechanisms of inorganic perovskites have promoted their efficiency development. [17][18][19] Based on the characterization by single crystal X-ray diffraction and X-ray pair distribution function measurements, Cava and co-workers confirmed that low effective coordination among Cs + and [PbI 6 ] 4− octahedra should be responsible for the instability of perovskite-phase CsPbI 3 . [19,20] Liang et al. further revealed the existence of many unavoidable defects in CsPbI 3 such as Cs + vacancy, undercoordinated Pb 2+ , etc. [21] These defects can weaken the interactions between Cs + and [PbI 6 ] 4− octahedra, which decreases the energy difference between the black and yellow phases. [22] It is therefore important to solve the issue of defect-triggered phase degradation in inorganic CsPbI 3 perovskite. Currently, defect passivation is an effective approach to improve the performance of inorganic CsPbI 3 perovskites including phase stability and optoelectrical performance. Many passivation agents including phenyltrimethylammonium chloride, octylammonium iodides, ureaammonium thiocyanate, etc., have been developed to stabilize and passivate inorganic perovskites. [23][24][25] Crystal secondary growth has been widely utilized in hybrid perovskites to reduce the defects as well as to enhance the stability and optoelectrical performance. The most popular crystal secondary growth approach is the postsynthetic halide salt treatment, especially using the solution of Br salt for treatment. [26,27] In OIHPs, such as MAPbI 3 , the crystal secondary growth occurs easily during a postsynthesis ammonium halide solution treatment even without thermal annealing. However, such crystal secondary growth strategy is difficult to be implemented for inorganic perovskites, which could be ascribed to the strong ionic bonds in inorganic perovskite. There are few works reporting the crystal secondary growth of inorganic CsPbI 3 perovskite. Herein, we demonstrate a solidstate-reaction-induced crystal secondary growth of inorganic perovskite to realize the defect compensation in inorganic CsPbI 3 perovskite and improve the optoelectrical performance Defect-triggered phase degradation is generally considered as the main issue that causes phase instability and limited device performance for CsPbI 3 inorganic perovskites. Here, a defect compensation in CsPbI 3 perovskite through crystal secondary growth of inorganic perovskites is demonstrated, and highly efficient inorganic photovoltaics are realized. This secondary growth is achieved by a solid-state reaction between a bromine salt and defective CsPbI 3 perovskite. Upon solid-state rea...

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confidence: 99%

Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

et al. 2021

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“…Some very recent processes are working on reducing defects 75 , improving thermal stability 114 , enhancing spectral stability under an electric field 79 , and preventing various chemical reactions of perovskites 115 . Some long-lifetime optoelectronic devices made with perovskite materials have been realised in recent studies, e.g., a long half-lifetime of 682 hours in formamidinium-based PeLEDs 115 and over 1000 h (lifetime: T 90 ) in perovskite-based solar cells 116 , 117 . These works have inspired stability research on PeLEDs and will also promote the development of long-lifetime perovskite-based WLEDs.…”

Section: Discussionmentioning

confidence: 99%

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

et al. 2021

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Carbon neutrality, energy savings, and lighting costs and quality have always led to urgent demand for lighting technology innovation. White light-emitting diodes (WLEDs) based on a single emissive layer (SEL) fabricated by the solution method have been continuously researched in recent years; they are advantageous because they have a low cost and are ultrathin and flexible. Here, we reviewed the history and development of SEL–WLEDs over recent years to provide inspiration and promote their progress in lighting applications. We first introduced the emitters and analysed the advantages of these emitters in creating SEL–WLEDs and then reviewed some cases that involve the above emitters, which were formed via vacuum thermal evaporation or solution processes. Some notable developments that deserve attention are highlighted in this review due to their potential use in SEL–WLEDs, such as perovskite materials. Finally, we looked at future development trends of SEL–WLEDs and proposed potential research directions.

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“…[104] In addition to the traditional organic solvents,t he incorporation of some selected ionic liquids (ILs) has also been found to enhance both the cell efficiency and the longterm stability of perovskite photovoltaics. [20,[105][106][107] As there is generally astrong electrostatic force between the constituent cations and anions of ionic liquids,they normally exhibit high boiling points,e xtremely low vapor pressures,h igh ionic conductivities as well as high thermal and electrochemical stabilities. [108] Thea ddition of ionic liquids to ap erovskite precursor can prevent rapid nucleation and facilitate the formation of amore uniform film.…”

Section: Methodsmentioning

confidence: 99%

“…[16] Since Snaith and co-workers first fabricated black phase CsPbI 3 -based PSCs in 2015 with the aid of hydroiodic acid (HI), [17] impressive progress has been made in this field, with an improvement in the efficiency from 2.9 %t oover 20 %i n2 021. [18][19][20] However,s ome major challenges remain regarding the application of cesium lead halide perovskite (CsPbX 3 ), such as its long-term stability,e specially against moisture,and its room-temperature phase transition from the black perovskite phase to the yellow nonperovskite phase.T hese disadvantages greatly reduce the ability of aC sPbX 3 film to absorb and convert solar energy and, therefore,affects the photovoltaic performance. [13,21] Recent progress in the field of inorganic CsPbX 3 perovskite and its applications have been discussed in several reviews and perspectives.…”

Section: Introductionmentioning

confidence: 99%

Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

2021

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All‐inorganic perovskites have attracted increasing attention for applications in perovskite solar cells (PSCs) and optoelectronics, including light‐emitting devices (LEDs). Cesium lead halide perovskites with tunable I/Br ratios and a band gap aligning with the sunlight region are promising candidates for PSCs. Although impressive progress has been made to improve device efficiency from the initial 2.9 % with low phase stability to over 20 % with high stability, there are still questions regarding the perovskite crystal growth mechanism, especially at low temperatures. In this Minireview, we summarize recent developments in using an organic matrix, including the addition and use of organic ions, polymers, and solvent molecules, for the crystallization of black phase inorganic perovskites at temperatures lower than the phase transition point. We also discuss possible mechanisms for this low‐temperature crystallization and their effect on the stability of black phase perovskites. We conclude with an outlook and perspective for further fabrication of large‐scale inorganic perovskites for optoelectronic applications.

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Efficient (>20 %) and Stable All‐Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts

Cited by 199 publications

References 48 publications

Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

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Efficient (>20 %) and Stable All‐Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts

Cited by 199 publications

References 48 publications

Efficient and Stable CsPbI3 Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

Efficient and Stable CsPbI3 Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

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Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth

Efficient and Stable CsPbI₃ Inorganic Perovskite Photovoltaics Enabled by Crystal Secondary Growth