Suppressing “Coffee ring effect” to deposit high-quality CsPbI3 perovskite films by drop casting

Zhang, Qixian; Liu, Huicong; Tan, Xue; Wang, Hailiang; Song, Yongfa; Wei, Xiaozhen; Deng, Yue; Li, Weiping; Zhou, Liqun; Cui, Zhenhua; Bai, Yang; Chen, Haining

doi:10.1016/j.cej.2022.140147

Cited by 16 publications

(4 citation statements)

References 29 publications

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“…Since the first report of HTL-free inorganic CsPbI 3 C-PSCs with a low PCE of 4.65% by Liang et al, many efforts have been made to improve the efficiency of this kind of device, including composition manipulation, − element doping, interface engineering, , process optimization, , etc., which significantly boost the PCE of CsPbI 3 C-PSCs to over 16% till now. , Especially, Chen’s group pioneered the high-efficiency CsPbI 3 C-PSCs via composition manipulation, which demonstrated that carefully controlling the precursor ratios of dimethylammonium iodide (DMAI)/PbI 2 /CsI can suppress the formation of δ-CsPbI 3 , minimize DMAPbI 3 residual, and generate PbI 2 passivator, simultaneously, thus boosting the PCE of CsPbI 3 C-PSC to 14.6% . Later, CsCl is introduced into the surface of CsPbI 3 films to induce the formation of an energy level gradient as well as an electron blocking layer, further improving the PCE of this kind of device to 15.23% .…”

Section: Introductionmentioning

confidence: 99%

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Liu

Sun

Wang

et al. 2023

ACS Appl. Energy Mater.

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Hole-transporting layer (HTL)-free CsPbI3 carbon-based perovskite solar cells (C-PSCs) are regarded as a promising photovoltaic candidate due to their low cost and enhanced device stability. However, the imperfect perovskite/carbon interface, including surface defects of CsPbI3 films, unmatched energy level alignment, etc., leads to a low power conversion efficiency (PCE) and thus hampers its further development for commercialization. Herein, a multifunctional interface modifier octylammonium iodide (OAI) is introduced into the CsPbI3/carbon interface, which can not only reduce the amount of residual PbI2 at grain boundaries by converting PbI2 to the (OA)2PbI4 two-dimensional (2D) phase but also passivate defects located at the surface and grain boundaries of CsPbI3 films. Consequently, greatly reduced defect density of CsPbI3 films as well as matched energy level alignment of the CsPbI3/carbon interface are achieved, which significantly boost the PCE of CsPbI3 C-PSCs from 12.97 to 14.64%. Moreover, due to the reduced amount of PbI2 at grain boundaries and the hydrophobic property of long-chain alkyl in OAI, the unencapsulated CsPbI3 C-PSCs demonstrate excellent long-term ambient stability, which can retain 91% of its initial PCE after 30 days of storage in air.

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Section: Introductionmentioning

confidence: 99%

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Liu

Sun

Wang

et al. 2023

ACS Appl. Energy Mater.

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“…Therefore, researchers usually use composition engineering [72][73][74], solvent engineering [75][76][77][78], additive engineering [14,[79][80][81][82], intermediate-phase engineering [50,83,84], and optimization of film deposition methods [27,[85][86][87][88] to obtain high-quality perovskite films (table 4).…”

Section: Design Of Perovskite Active Layermentioning

confidence: 99%

Carbon-based perovskite solar cells with electron and hole-transporting/-blocking layers

et al. 2023

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For commercialization, further reducing the cost and increasing the stability of perovskite solar cell (PSC) have been the most essential tasks for researchers, since the efficiency of single-junction PSCs has reached a competitive level among all kinds of single-junction solar cells. Carbon-electrode-based PSCs (CPSCs), as one of the most promising constructions for achieving stable economical PSCs, now attract enormous attention. Here, we briefly review the development of CPSCs and reveal the importance of the n-i-p architecture for state-of-the-art CPSCs. Despite the promise, challenges still exist in CPSCs of n-i-p architecture, which mainly steam from the incompact contact of hole transporting layer (HTL)/carbon electrode. Thus, new carbon materials and/or novel manufactural methods should be proposed. Specifically, HTL is yet to be appropriate for state-of-the-art CPSCs since the solution process of carbon electrode may destroy the underlayer. And for further enhance the performance of CPSCs, both HTL and electron transporting layer (ETL) as well as their interfaces with perovskite active layer need to be improved. Besides, we recommend that the perovskite active layer with long carrier lifetime, strong carrier transport capability and long-term stability is of significance as well. We highlight the current researches on CPSCs and provide a systematic review of various types of regulation tools.

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“…Specific methods for suppressing coffee rings include manipulating the substrate temperature or surface energy, solvent engineering, increasing the viscosity of the solution, and adding surfactants [27][28][29][30] . Despite effective strategies having been developed to suppress coffee rings 27,31 , the formation of perovskite polycrystalline films, however, involves complex crystallization processes including nucleation, diffusion, and growth rather than simply crystal deposition [32][33][34][35][36] , implying that the 'Coffee ring effect' is not the only factor that affects the uniformity of the film, and does not dominate the emergence of rings, indicating existing methods do not effectively inhibit rings from forming. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Rational adjustment to interfacial interaction with carbonized polymer dots enabling efficient large-area perovskite light-emitting diodes

et al. 2023

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Film uniformity of solution-processed layers is the cornerstone of large-area perovskite light-emitting diodes, which is often determined by the ‘coffee-ring effect’. Here we demonstrate a second factor that cannot be ignored is the solid-liquid interface interaction between substrate and precursor and can be optimized to eliminate rings. A perovskite film with rings can be formed when cations dominate the solid-liquid interface interaction; whereas smooth and homogeneous perovskite emitting layers are generated when anions and anion groups dominate the interaction. This is due to the fact that the type of ions anchored to the substrate can determine how the subsequent film grows. This interfacial interaction is adjusted using carbonized polymer dots, who also orient the perovskite crystals and passivate their buried traps, enabling a 225 mm2 large-area perovskite light-emitting diode with a high efficiency of 20.2%.

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Suppressing “Coffee ring effect” to deposit high-quality CsPbI3 perovskite films by drop casting

Cited by 16 publications

References 29 publications

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Carbon-based perovskite solar cells with electron and hole-transporting/-blocking layers

Rational adjustment to interfacial interaction with carbonized polymer dots enabling efficient large-area perovskite light-emitting diodes

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Suppressing “Coffee ring effect” to deposit high-quality CsPbI3 perovskite films by drop casting

Cited by 16 publications

References 29 publications

Surface Passivation of CsPbI 3 Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Surface Passivation of CsPbI 3 Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Carbon-based perovskite solar cells with electron and hole-transporting/-blocking layers

Rational adjustment to interfacial interaction with carbonized polymer dots enabling efficient large-area perovskite light-emitting diodes

Contact Info

Product

Resources

About

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

Surface Passivation of CsPbI ₃ Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells