All Green Solvents for Fabrication of CsPbBr<sub>3</sub> Films for Efficient Solar Cells Guided by the Hansen Solubility Theory

Cao, Xiaobing; Zhang, Guoshuai; Cai, Yifan; Jiang, L.; He, Xin; Zeng, Qingguang; Wei, Jinquan; Jia, Yi; Xing, Guichuan; Huang, Wei

doi:10.1002/solr.202000008

Cited by 34 publications

(28 citation statements)

References 43 publications

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“…It is worth noting that the champion PCE is improved by 45.4% in comparison with the 6.69% efficiency of the control PSC in this study and is much larger than the reported value in other works. [ 42–48 ] On the basis of the equation:

{italicE}_{loss} = {italicE}_{normalg} - {italiceV}_{OC}

, where E loss represents the energy loss in the device and E g stands for the optical bandgap of related perovskite film. It is obviously that Cl − ion doping widens the bandgap because of the electron density redistribution and reduces the E loss due to the enhancement of energy‐level alignment and the repression of charge recombination, leading to a higher V OC .…”

Section: Resultsmentioning

confidence: 99%

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Gong

et al. 2020

Solar RRL

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Carbon‐based CsPbBr3 perovskite solar cells (PSCs) without hole‐transporting layers (HTLs) have aroused extensive attention due to their low manufacturing cost and prominent ambient stability. However, the defects of perovskite film and the poor charge extraction within PSCs result in severe charge recombination, which restricts the further enhancement of device efficiency. In view of this critical point, a compositional engineering of CsPbBr3 perovskite via doping with Cl− ions is presented herein to decrease the trap states and enhance the charge extraction. It is revealed that the doping of Cl− ions not only enlarges the grain size and thereby reduces the trap‐state density, but also optimizes the energy‐level alignment and improves the hole mobility of the perovskite film, leading to an evidently suppressed charge recombination and improved charge extraction and transportation. As a result, a champion power conversion efficiency (PCE) of 9.73% is achieved for carbon‐based HTL‐free CsPbBr2.98Cl0.02 PSC, yielding a marked enhancement in comparison with 6.69% efficiency for the control. Meanwhile, the thermal and moisture stabilities of unencapsulated CsPbBr2.98Cl0.02 PSC are improved, maintaining 93% and 95% of the initial PCE after expose to air atmosphere with 80% relative humidity (RH) and at 80 °C over 60 days, respectively.

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{italicE}_{loss} = {italicE}_{normalg} - {italiceV}_{OC}

Section: Resultsmentioning

confidence: 99%

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Gong

et al. 2020

Solar RRL

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“…Hansen solubility parameters (HSPs) have previously been employed to predict the solubility of organic semiconducting small molecules. [ 93–98 ] Rather than chemical modification of the semiconducting materials, which can increase the synthetic challenges and negatively affect the blend morphology of the active layer, solvent libraries can be searched to find solvent systems that are compatible with current OPV materials without negatively impacting device performance. An example of the effective use of HSPs is the identification molecular phase stabilizers for overcoming microstructure instabilities in high performance PCE11:PC[70]BM OPV.…”

Section: Industrial Compatibility Of Active Layer Processingmentioning

confidence: 99%

Challenges to the Success of Commercial Organic Photovoltaic Products

Moser

Wadsworth

Gasparini

et al. 2021

Advanced Energy Materials

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Recent advances in the development of organic photovoltaic (OPV) materials has led to significant improvements in device performance; now closing in on the 20% efficiency threshold. Despite these improvements in performance, the commercial viability of organic photovoltaic products remains elusive. In this perspective, the current limitations of high performing blends are uncovered, particularly focusing on the industrial upscaling considerations of these materials, such as synthetic scalability, active layer processing, and device stability. Moreover, a simplified metric, namely, the scalability factor (SF), is introduced to evaluate the scale‐up potential of specific OPV materials and blends thereof. Of the most popular molecular design strategies investigated in recent times, it is found that the use of Y‐series nonfullerene acceptors (NFAs) and synthetically simple materials, such as PTQ‐10 and ternary blends, are most effective at maximizing the efficiency without negatively impacting the SF. Furthermore, the improvements that are needed, in terms of device processability and stability, are considered for industrial scale‐up and final product application. Finally, an outlook of organic photovoltaics is provided both from a perspective of important research avenues and applications that can be exploited.

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“…In this context, a preliminary selection of innovative mixtures of solvents, which can match both the volatility and safety requirements can be carried out at first stage by the Hansen solubility parameters (HSP) approach. [83,84] In this way, the HSP of solvent mixtures can be calculated and compared to HSP of perovskite precursors and charge transporting materials, so as to reduce the amount of solubility tests.…”

Section: Paths Toward Improved Stabilitymentioning

confidence: 99%

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

Montecucco

Quadrivi

Pò

et al. 2021

Advanced Energy Materials

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high defect tolerance, long carrier diffusion length, and compatibility toward scalable manufacturing processes to name a few. [2][3][4][5][6][7] However, hybrid perovskites face severe degradation issues under operative conditions, which stem from the (photo) chemical instability when exposed to moisture, oxygen, UV light, and heat. [8][9][10][11][12] Among other reasons, the presence of the hydrophobic organic cation, e.g., methylammonium, can accelerate the degradation path. [12][13][14] For this reason, a greater focus has been devoted to exploring inorganic elements to replace the organic cations, for instance, using cesium to form CsPbX 3 all-inorganic perovskites. This system has been revealed of particular interest especially for the improved thermal stability of the material and, consequently, the enhanced device lifetime. [13] CsPbI 3 and CsPbBr 3 are the most studied materials within this class, with a rapid boost of their use for highly efficient solar cells, reaching 19.03% in 2019. [15] However, the PCE of CsPbX 3 -based devices are still lower than their organic-inorganic counterparts and far from the Shockley-Queisser limit calculated for their bandgap. [16] Therefore, major efforts are required to stabilize the CsPbI 3 structure and to fabricate high quality CsPbX 3 thin films, before upscaling the manufacturing toward marketable devices. In this work, we provide a compelling perspective on the most recent and innovative strategies to tackle this challenge. The structural and optoelectronic properties of CsPbX 3 materials are first sorted out, with a focus on the film morphology, crystal structure, and phase transitions of each system. Second, methods for improving the photovoltaic performances and the stability of CsPbX 3 -based devices are reported, focusing on the highest PCE and the longest device lifetimes reported up to date. Finally, we provide a perspective on the state of the art and future challenges for the upscaling of all-inorganic perovskite modules.

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All Green Solvents for Fabrication of CsPbBr₃ Films for Efficient Solar Cells Guided by the Hansen Solubility Theory

Cited by 34 publications

References 43 publications

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Challenges to the Success of Commercial Organic Photovoltaic Products

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

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All Green Solvents for Fabrication of CsPbBr3 Films for Efficient Solar Cells Guided by the Hansen Solubility Theory

Cited by 34 publications

References 43 publications

Compositional Engineering of Chloride Ion‐Doped CsPbBr3 Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Compositional Engineering of Chloride Ion‐Doped CsPbBr3 Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Challenges to the Success of Commercial Organic Photovoltaic Products

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

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Product

Resources

About

All Green Solvents for Fabrication of CsPbBr₃ Films for Efficient Solar Cells Guided by the Hansen Solubility Theory

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells

Compositional Engineering of Chloride Ion‐Doped CsPbBr₃ Halides for Highly Efficient and Stable All‐Inorganic Perovskite Solar Cells