Highly Luminescent and Stable Perovskite Nanocrystals with Octylphosphonic Acid as a Ligand for Efficient Light-Emitting Diodes

Tan, Yeshu; Zou, Yatao; Wu, Linzhong; Huang, Qi; Yang, Di; Chen, Min; Ban, Muyang; Wu, Chongfeng; Tian, Wenjing; Bai, Sai; Song, Tao; Zhang, Qiao

doi:10.1021/acsami.7b17166

Cited by 256 publications

(257 citation statements)

References 39 publications

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“…Tan et al proposed that it could dramatically enhance the CsPbX 3 stability and preserve their high PL QY (>90%) by using octylphosphonic acid (OPA) to replace the OA/OLA ligands, which is shown Figure d. Meanwhile, Figure e shows the EQE of modified LED was improved from 0.86% to 6.5% after multiple purification processes . Hence, It is critical to choose appropriate washing solvent and surface passivators for IHP NCs to keep their high QY, device performance, and stability …”

Section: Improving the Leds Performance Of Ihp Ncsmentioning

confidence: 99%

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Yang

Zeng

2018

Adv Materials Inter

236

225

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All inorganic halide perovskite (IHP) nanocrystals (NCs) have emerged as a new class of optoelectronic materials for various applications. Surface ligands as surface passivators are essential components of nucleation and growth processes, photoluminescence quantum yields (PL QY), stability, and photoelectric applications. In this review, the relationship of perovskite structure modified is outlined by surface ligand and some properties on account of the ion structure features. This review specifically focuses on the roles of surface ligands in the construction of IHP NCs with fewer defects, higher PL QY, and better stability. Generally, ligands binding to the surface of IHP NCs can form passivation layer, which are beneficial to not only the improvement of PL QY by filling the Br− or Pb2+ vacancy but also the enhancement of stability. The surface passivation mechanisms are attributed to the [Br⋯HN+] hydrogen‐bonding, chelation, and dative covalent bond interactions. Furthermore, degradation mechanisms assigned to the hydration, ion migration, and dissociation are discussed. The equilibrium problem of purifying and QY and possible reasons are also addressed, which are believed to be solved in the near future with the help of coordination chemistry and surface engineering. Finally, a brief outlook including challenges and possible development is provided.

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Section: Improving the Leds Performance Of Ihp Ncsmentioning

confidence: 99%

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Yang

Zeng

2018

Adv Materials Inter

236

225

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“…Although most early research studies were focused on bulk thin film perovskites, very recently there has been a growing interest in exploring perovskite nanocrystals (NCs) for various applications due to their enhanced stability in the presence of ligands . Several studies have already shown that perovskite NCs possess great potential for solution‐processable photovoltaic devices under ambient atmosphere due to their high environmental and thermodynamic stabilities .…”

Section: Responsivity (R) and Detectivity (D*) Of Photodetectors Undementioning

confidence: 99%

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Yao

Bohn

Huang

et al. 2019

Advanced Optical Materials

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These properties have led to an enormous progress in various optoelectronic applications, especially to the impressive advances in the efficiency of photovoltaics that surged from 3.8% to 22% during the past few years. [5][6][7][8][9] Although most early research studies were focused on bulk thin film perovskites, very recently there has been a growing interest in exploring perovskite nanocrystals (NCs) for various applications due to their enhanced stability in the presence of ligands. [10][11][12][13] Several studies have already shown that perovskite NCs possess great potential for solution-processable photovoltaic devices under ambient atmosphere due to their high environmental and thermodynamic stabilities. [14][15][16] Other studies demonstrate the charge transfer dynamics for perovskite NCs in heterojunctions showing great potential for charge extraction in further applications. [17][18][19][20] Most reported perovskite photovoltaic devices are generally fabricated in a layer-by-layer configuration in which the exciton dissociation occurs at the interface of the perovskite NC layer and the respective electron or hole-transport layer. Therefore, the device performance relies on the diffusion of excitons or free carriers in the perovskite NC layer, which is reported as a fatal issue for ligand-capped colloidal NCs. [21][22][23][24] It is worth mentioning that organic semiconductor-based photovoltaic devices also suffer from similar problems. In order to enrich the donor-acceptor interfaces as well as to shrink the exciton diffusion path length, blend structures (donor and acceptor materials are mixed in one layer) have often been employed for achieving highly efficient organic photovoltaic devices. [25][26][27][28] However, it is difficult to fabricate such blend structures based on bulk thin film perovskites which are grown using precursors dissolved in polar solvents such as dimethylformamide and dimethyl sulfoxide. [5][6][7][8][9] In contrast, perovskite NCs fortunately are commonly dispersed in organic solvents in which organic electron-acceptor materials such as the fullerene derivative phenyl-C 61 -butyric acid methyl ester (PCBM) can be dissolved as well. This enables the fabrication of perovskite NC/PCBM blend structures similar to bulk heterojunction configurations in organic photovoltaic devices. Recently, Shen et al. have shown the fabrication of Solution-processable perovskite nanocrystals (NCs) are gaining increasing interest in the field of photovoltaics because of their enhanced stability compared to their thin-film counterparts. However, the charge transfer dynamics in perovskite NC based light-harvesting systems are not well understood. By applying femtosecond differential transmission (DT) spectroscopy the photoinduced charge transfer from inorganic perovskite CsPbBr 3 NCs to the fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM) is investigated for two fundamentally different architectures, namely layer-by-layer heterostructures and blend structures. By varying the thickness ...

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“…[11] Therefore, it is ap rimary concernt os earch for as ystem with high quantum yield withoutc ompromising stability. [15] Thus, capping is one of the most efficient ways to enhance thes tability of perovskite NCs in the solution [16][17][18] Oleic acid (OA) and oleylamine( OAm) are popular capping agentsr eported in the literature for the synthesis of such perovskite NCs. Properties of Bi-doped Pb halide NCs have been explored recently by somer esearch groups.…”

mentioning

confidence: 99%

Reversible Ultra‐Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping

Chatterjee

Dey

Das

et al. 2020

Chemistry A European J

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An ultra-slow crystal growth over ap eriod of 24 ho fan ewly synthesized CH 3 NH 3 Pb 1/2 Bi 1/3 I 3 perovskite (MPBI) nanocrystal in non-polart oluene medium is reported here. From severals pectroscopic techniques as wella s from TEM analysis we found that the size of nanocrystals changes continuouslyw ith time, in spite of being capped by the ligands. Using as ingle molecular spectroscopic technique, we also found that this size changei sn ot due to the stacking of nanocrystalsb ut duet oc rystal growth. The notable temperature dependence and reversible nature of the nanocrystals growth is explainedb yt he dynamic nature of the capping. The observed temperaturedependent ultra-slow growth is believed to be ap ragmatic step towards controlling the size of perovskite NC in a systematic manner.

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Highly Luminescent and Stable Perovskite Nanocrystals with Octylphosphonic Acid as a Ligand for Efficient Light-Emitting Diodes

Cited by 256 publications

References 39 publications

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Reversible Ultra‐Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping

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Highly Luminescent and Stable Perovskite Nanocrystals with Octylphosphonic Acid as a Ligand for Efficient Light-Emitting Diodes

Cited by 256 publications

References 39 publications

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr3 Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Reversible Ultra‐Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping

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Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures