Scalable Ambient Fabrication of High-Performance CsPbI2Br Solar Cells

Fan, Yuanyuan; Fang, Junfei; Chang, Xiaoming; Tang, Maochun; Barrit, Dounya; Xu, Zhuo; Jiang, Zhiwu; Wen, Jialun; Zhao, Huan; Niu, Tianqi; Smilgies, Detlef‐M.; Jin, Shengye; Liu, Zhike; Li, Erqiang; Amassian, Aram; Liu, Shengzhong; Zhao, Kui

doi:10.1016/j.joule.2019.07.015

Cited by 137 publications

(132 citation statements)

References 67 publications

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“…[34,35,41,42] Recently, a few studies have been reported for the film formation during solution processing of mixed-cation mixed halide perovskites. [43][44][45] For instance, Qin et al investigated film formation during spin coating for Cs x (FA 0.83 MA 0.17 ) 1−x Pb(I 0.83 Br 0.17 ) 3 and revealed the role of Cs in suppressing the formation of hexagonal polytypes (4H, 6H). [43] Szostak et al investigated the impact of precursor solvents, humidity, and dropping antisolvent on the film formation for Cs 0.17 FA 0.83 Pb(I 0.83 Br 0.17 ) 3 and MA 0.17 FA 0.83 Pb(Br 0.17 I 0.83 ) 3 during spin coating.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Abdelsamie

Bruening

et al. 2020

Adv Funct Materials

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Understanding crystallization processes and their pathways in metal‐halide perovskites is of crucial importance as this strongly affects the film microstructure, its stability, and device performance. While many approaches are developed to control perovskite formation, the mechanisms of film formation are still poorly known. Using time‐resolved in situ grazing incidence wide‐angle X‐ray scattering, the film formation of perovskites is investigated with average stoichiometry Cs0.15FA0.85PbI3, where FA is formamidinium, using the popular antisolvent dropping and gas jet treatments and this is contrasted with untreated films. i) The crystallization pathways during spin coating, ii) the subsequent postdeposition thermal annealing, and iii) crystallization during blade coating are studied. The findings reveal that the formation of a nonperovskite FAPbI3 phase during spin coating is initially dominant regardless of the processing and that the processing treatment (e.g., antisolvent dropping, gas jet) has a significant impact on the as‐cast film structure and affects the phase evolution during subsequent thermal treatment. It is shown that blade coating can be used to overcome the nonperovskite phase formation via solvothermal direct crystallization of perovskite phase. This work shows how real‐time investigation of perovskite formation can help to establish processing–microstructure–functionality relationships.

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Section: Introductionmentioning

confidence: 99%

“…[44] Fan et al probed the crystallization of all inorganic perovskites during blade coating and revealed the effect of blade-coating conditions on perovskite formation. [45] However, a comparison of the mechanism of different processing treatments during spin coating versus blade coating for mixed cation perovskites is lacking.…”

Section: Introductionmentioning

confidence: 99%

Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Abdelsamie

Bruening

et al. 2020

Adv Funct Materials

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“…Alternatively, mixed‐halide CsPbI (3 − y ) Br y perovskites were explored to balance the trade‐off between bandgap and stability. In particular, CsPbI 2 Br perovskite has been considered as a potential candidate for inorganic PSC due to its reasonable bandgap (≈1.9 eV) and much improved ambient stability . However, it is still structurally unstable and can easily transform into nonperovskite orthorhombic phase under prolonged exposure to high humidity .…”

Section: Introductionmentioning

confidence: 99%

Guanidinium Passivation for Air‐Stable Rubidium‐Incorporated Cs_{(1 − x)}Rb_xPbI₂Br Inorganic Perovskite Solar Cells

Zhang

Xiong

et al. 2020

Solar RRL

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Inorganic CsPbI2Br perovskite has gained growing attention due to its potential for improving device performance and stability. However, the notorious phase transition from the photoactive to photoinctive phase in ambient atmosphere hinders its further development. Herein, air‐stable rubidium (Rb)‐incorporated Cs(1 − x)RbxPbI2Br perovskite with guanidinium bromide (GABr) post‐treatment is demonstrated. The incorporation of smaller monovalent Rb cation contributes to a contraction of the perovskite crystal, leading to an improvement in structure stability. In addition, GABr modification induces a 2D/3D heterostructure perovskite with high crystallinity, appropriate surface morphology, favorable electronic properties, and significantly reduced trap‐state density. Consequently, the fabricated perovskite solar cells deliver a power conversion efficiency (PCE) of 15.6%, which is much higher than the 12.9% reported for reference CsPbI2Br‐based devices. Meanwhile, the significantly enhanced long‐term (88% of initial PCE after 60 days), thermal (76% of initial PCE after 30 days) as well as light soaking (90% of initial PCE after 300 min) stability in ambient atmosphere is demonstrated.

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“…As one of the effective approaches to utilize solar energy converting energy, photovoltaics have received extensive attention. Achieving high-efficiency, large-area manufacture, and excellent environmental stability are the goals (Liu et al, 2015;Niu et al, 2018;Fan et al, 2019;Xu et al, 2019a,b;Zhu et al, 2019;Zhang et al, 2020). Especially, organic photovoltaic devices (OPVs) using solution-processible donor-acceptor bulk heterojunction (BHJ) as photon-harvesting active layer are attractive for next-generation flexible photovoltaic modules (Li et al, , 2018Lin et al, 2012;Heeger, 2014;Dong et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

et al. 2020

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Organic donor-acceptor bulk heterojunction are attracting wide interests for solar cell applications due to solution processability, mechanical flexibility, and low cost. The photovoltaic performance of such thin film is strongly dependent on vertical phase separation of each component. Although film-depth-dependent light absorption spectra measured by non-in situ methods have been used to investigate the film-depth profiling of organic semiconducting thin films, the in situ measurement is still not well-resolved. In this work, we propose an in situ measurement method in combination with a self-developed in situ instrument, which integrates a capacitive coupled plasma generator, a light source, and a spectrometer. This in situ method and instrument are easily accessible and easily equipped in laboratories of the organic electronics, which could be used to conveniently investigate the film-depth-dependent optical and electronic properties.

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Scalable Ambient Fabrication of High-Performance CsPbI2Br Solar Cells

Cited by 137 publications

References 67 publications

Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Guanidinium Passivation for Air‐Stable Rubidium‐Incorporated Cs_{(1 − x)}Rb_xPbI₂Br Inorganic Perovskite Solar Cells

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

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Scalable Ambient Fabrication of High-Performance CsPbI2Br Solar Cells

Cited by 137 publications

References 67 publications

Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation

Guanidinium Passivation for Air‐Stable Rubidium‐Incorporated Cs(1 − x)RbxPbI2Br Inorganic Perovskite Solar Cells

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

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Guanidinium Passivation for Air‐Stable Rubidium‐Incorporated Cs_{(1 − x)}Rb_xPbI₂Br Inorganic Perovskite Solar Cells