Microstructure and lattice strain control towards high-performance ambient green-printed perovskite solar cells

Fang, Junfei; Ding, Zicheng; Chang, Xiaoming; Lu, Jing; Yang, Tinghuan; Wen, Jialun; Fan, Yuanyuan; Zhang, Yalan; Luo, Tao; Chen, Yonghua; Liu, Shengzhong; Zhao, Kui

doi:10.1039/d1ta01763b

Cited by 31 publications

(39 citation statements)

References 66 publications

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“…[104] The microstructure and lattice strain control enabled the efficiency to improve from 18.26% to 20.21%, comparable to the efficiencies of the state-of-the-art MAPbI 3based cells fabricated from toxic solvents. [134] Using the blade-coating process, Fan et al developed a scalable ambient fabrication of high-performance CsPbI 2 Br solar cells with an efficiency of 14.7% for small-aperture-area (0.03 cm 2 ) and 12.5% for the large-aperture-area (1.0 cm 2 ) ones, the highest at the time for large-area all-inorganic perovskite solar cells. [102] It is known that the conflict between air-flow-assisted fast drying and low-quality film causes energy misalignment and trap formation.…”

Section: Blade Coatingmentioning

confidence: 99%

Recent Developments in Upscalable Printing Techniques for Perovskite Solar Cells

et al. 2022

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Just over a decade, perovskite solar cells (PSCs) have been emerged as a next‐generation photovoltaic technology due to their skyrocketing power conversion efficiency (PCE), low cost, and easy manufacturing techniques compared to Si solar cells. Several methods and procedures have been developed to fabricate high‐quality perovskite films to improve the scalability and commercialize PSCs. Recently, several printing technologies such as blade‐coating, slot‐die coating, spray coating, flexographic printing, gravure printing, screen printing, and inkjet printing have been found to be very effective in controlling film formation and improving the PCE of over 21%. This review summarizes the intensive research efforts given for these printing techniques to scale up the perovskite films as well as the hole transport layer (HTL), the electron transport layer (ETL), and electrodes for PSCs. In the end, this review presents a description of the future research scope to overcome the challenges being faced in the printing techniques for the commercialization of PSCs.

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Section: Blade Coatingmentioning

confidence: 99%

Recent Developments in Upscalable Printing Techniques for Perovskite Solar Cells

et al. 2022

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“…As presented in Figure 2b,c, the 𝜖 of DTAC-derived perovskite film decreased to 5 × 10 -4 when compared to the control with 7 × 10 -4 , suggesting the release of a residual strain of perovskite-substrate interfaces by the dynamic modulation of soft self-adaptive long-chains. [32] Based on the above data, a mechanism of residual strain was proposed for perovskite films. As shown in Figure 1b, the volume contraction of the perovskite film for the ideal state without residual strain (Figure 1b(I)) was consistent with that of the substrate from thermal annealing to room temperature.…”

Section: Resultsmentioning

confidence: 99%

Constructing Soft Perovskite–Substrate Interfaces for Dynamic Modulation of Perovskite Film in Inverted Solar Cells with Over 6200 Hours Photostability

Qiu

et al. 2022

Advanced Science

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High‐performance perovskite solar cells (PSCs) depend heavily on the quality of perovskite films, which is closely related to the lattice distortion, perovskite crystallization, and interfacial defects when being spin‐coated and annealed on the substrate surface. Here, a dynamic strategy to modulate the perovskite film formation by using a soft perovskite–substrate interface constructed by employing amphiphilic soft molecules (ASMs) with long alkyl chains and Lewis base groups is proposed. The hydrophobic alkyl chains of ASMs interacted with poly(triarylamine) (PTAA) greatly improve the wettability of PTAA to facilitate the nucleation and growth of perovskite crystals, while the Lewis base groups bound to perovskite lattices significantly passivate the defects in situ. More importantly, this soft perovskite–substrate interface with ASMs between PTAA and perovskite film can dynamically match the lattice distortion with reduced interfacial residual strain upon perovskite crystallization and thermal annealing owing to the soft self‐adaptive long‐chains, leading to high‐quality perovskite films. Thus, the inverted PSCs show a power conversion efficiency approaching 20% with good reproducibility and negligible hysteresis. More impressively, the unencapsulated device exhibits state‐of‐the‐art photostability, retaining 84% of its initial efficiency under continuous simulated 1‐sun illumination for more than 6200 h at elevated temperature (≈65 °C).

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“…32 It is worth noting that the PSC prepared by the printing process based on the MAAc solvent achieves a maximum PCE of 20.21%, which is equivalent to the performance of spin coating. 33 Most importantly, it can also be docked with the existing industrialized photovoltaic manufacturing process without complicated optimization.…”

Section: New Discovery Of Maac For Pscsmentioning

confidence: 99%

“…The simple and environmentally tolerant preparation methods are suitable for large-scale production processes, such as blade coating, slot-die coating, inkjet printing, and softcover deposition . It is worth noting that the PSC prepared by the printing process based on the MAAc solvent achieves a maximum PCE of 20.21%, which is equivalent to the performance of spin coating . Most importantly, it can also be docked with the existing industrialized photovoltaic manufacturing process without complicated optimization.…”

Section: Ionic Liquids Maac For Pscsmentioning

confidence: 99%

Ionic Liquid for Perovskite Solar Cells: An Emerging Solvent Engineering Technology

et al. 2021

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Conspectus Perovskite solar cells (PSCs) have, in recent years, become one of the most in-depth photovoltaic materials in many different disciplines due to their long-range charge carrier diffusion lengths, strong light absorption, easy tuning of the band gaps, low defect density, and solution processability. The power conversion efficiency (PCE) of single-junction PSCs has reached a certified value of 25.5%, which has caught up with or even surpassed traditional photovoltaic technologies, such as silicon (Si) solar cells, thin film solar cell, etc. In addition to the performance of PSCs comparable to traditional photovoltaic technology, its biggest feature is that it can be prepared by a solution method. The preparation process of the solution method simplify the film preparation process and greatly reduce the preparation cost. In addition, the solution method provides a favorable option for the energy supply of flexible wearable devices in the future. At present, the preparation of PSCs mainly uses organic molecular solvents, including N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), and their mixed solvents. However, most of these commonly used organic solvents are unsafe and are likely to cause water and soil pollution, harm to the human body, and safety accidents. In addition, most solvents have a high coordination number, which limits the crystallization of perovskite. Furthermore, high-quality perovskite films require the introduction of a large amount of high boiling point, polar and aprotic antisolvents to assist crystallization, such as chlorobenzene, ether, and ethyl acetate. In addition to the toxicological problems of the antisolvent, the technology has a relatively narrow operating time window, relatively high operating environment requirements, and relatively low repeatability, which greatly limits the large-scale production of PSCs. Therefore, It is very necessary to develop a new solvent engineering technology for PSCs, which is green and pollution-free, is a simple process, and has high efficiency, long-term stability, and low cost. Recently, we have developed a series of ionic liquids, including MAAc, MAFa, BAAc, etc., which can be used as solvents to prepare efficient and stable PSCs. It allows the production of smooth and continuous polycrystalline perovskite thin films in ambient air through a simple spin coating method In this Account, we started with the discovery of ionic liquids as solvents to PSCs. We have proposed new strategies for improving and enhancing ionic liquid-based PSCs, including interface engineering, solvent engineering, and additive engineering. Furthermore, the stable and efficient mechanism of ionic liquid-based perovskite solar cells has been revealed. In view of the designable characteristics of ionic liquids, some functional ionic liquids have been designed and applied to different systems of halide perovskites, which has important guiding significance for the development of more functional ionic liquids for PSCs. Finally, the challe...

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Microstructure and lattice strain control towards high-performance ambient green-printed perovskite solar cells

Abstract: Solution-processed perovskite solar cells (PSCs) have made great progress in past years. However, most fabrication methods of PSCs in lab cannot be directly transferred to industrial printing, and the toxic...

Cited by 31 publications

References 66 publications

Recent Developments in Upscalable Printing Techniques for Perovskite Solar Cells

Recent Developments in Upscalable Printing Techniques for Perovskite Solar Cells

Constructing Soft Perovskite–Substrate Interfaces for Dynamic Modulation of Perovskite Film in Inverted Solar Cells with Over 6200 Hours Photostability

Ionic Liquid for Perovskite Solar Cells: An Emerging Solvent Engineering Technology

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