Influence of the concentration of TiCl4 solution used for post-treatment on mesoporous TiO2 layers in hybrid lead halide perovskite solar cells

Choe, Geunpyo; Kang, Jinhyun; Ryu, Ilhwan; Song, Sun‐Ju; Kim, Hyung Min; Yim, Sanggyu

doi:10.1016/j.solener.2017.07.065

Cited by 8 publications

(5 citation statements)

References 54 publications

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“…For solar cell fabrication, the TNTAs were first immersed in a 70 °C, 40 mM aqueous solution of TiCl 4 for 60 min, and subsequently dried, and then annealed at 500 °C for 30 min. This TiCl 4 treatment is used to improve the charge transport and reduce the interfacial recombination by passivating defect sites on the surface of TNTAs [26][27][28][29]. The perovskite precursor solution was prepared by dissolving 1 M formamidinium iodide (FAI), 1.1 M PbI 2 , 0.2 methylammonium bromide (MABr) and 0.2 M PbBr 2 in a 4:1 mixture of dimethylformamide:dimethyl sulfoxide.…”

Section: Solar Cell Preparation and Testingmentioning

confidence: 99%

Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

et al. 2019

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Anodically formed TiO 2 nanotube arrays (TNTAs) constitute an optoelectronic platform that is being studied for use as a photoanode in photoelectrocatalytic cells, as an electron transport layer (ETL) in solar cells and photodetectors, and as an active layer for chemiresistive and microwave sensors. For optimal transport of charge carriers in these one-dimensional polycrystalline ordered structures, it is desirable to introduce a preferential texture with the grains constituting the nanotube walls aligned along the transport direction. Through x-ray diffraction analysis, we demonstrate that choosing the right water content in the anodization electrolyte and the use of a post-anodization zinc ion treatment can introduce a preferential texture in sub-micron length transparent TNTAs formed on non-native substrates. The incorporation of 1.5 atom% of Zn in TiO 2 nanotubes prior to annealing, was found to consistently result in the strongest preferential orientation along the [001] direction.[001] oriented TNTAs exhibited a responsivity of 523 A W −1 at a bias of 2 V for 365 nm photons, which is among the highest reported performance values for ultraviolet photodetection using titania nanotubes. Furthermore, the textured nanotubes without a Zn 2+ treatment showed a significantly enhanced performance in halide perovskite solar cells that used TNTAs as the ETL.

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Section: Solar Cell Preparation and Testingmentioning

confidence: 99%

Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

et al. 2019

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“…Nevertheless, aside from the ETL morphology, key to the device efficiency is also to optimize the ETL/perovskite interface properties, e.g. by passivation of the TiO 2 surface defects and trap states . To this end, titanium tetrachloride (TiCl 4 ) treatment, has been reported as a most efficient approach to improve TiO 2 electron transport ability: it forms at the treated surface a nm‐thick layer of TiO 2 anatase nanoparticles (NPs, with size in the 5–10 nm range) that typically favors a more efficient charge extraction across the ETL/perovskite interface, thereby limiting photon losses ascribed to charge recombination in the light absorber …”

Section: Introductionmentioning

confidence: 99%

Engineering of the Electron Transport Layer/Perovskite Interface in Solar Cells Designed on TiO₂ Rutile Nanorods

Shahvaranfard

Altomare

Hou

et al. 2020

Adv Funct Materials

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The engineering of the electron transport layer (ETL)/light absorber interface is explored in perovskite solar cells. Single‐crystalline TiO2 nanorod (NR) arrays are used as ETL and methylammonium lead iodide (MAPI) as light absorber. A dual ETL surface modification is investigated, namely by a TiCl4 treatment combined with a subsequent PC61BM monolayer deposition, and the effects on the device photovoltaic performance were evaluated with respect to single modifications. Under optimized conditions, for the combined treatment synergistic effects are observed that lead to remarkable enhancements in cell efficiency, from 14.2% to 19.5%, and to suppression of hysteresis. The devices show JSC, VOC, and fill factor as high as 23.2 mA cm−2, 1.1 V, and 77%, respectively. These results are ascribed to a more efficient charge transfer across the ETL/perovskite interface, which originates from the passivation of defects and trap states at the ETL surface. To the best of our knowledge, this is the highest cell performance ever reported for TiO2 NR‐based solar cells fabricated with conventional MAPI light absorber. Perspective wise, this ETL surface functionalization approach combined with more recently developed and better performing light absorbers, such as mixed cation/anion hybrid perovskite materials, is expected to provide further performance enhancements.

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“…Besides this, TiCl 4 soaking treatment has been investigated in dye-sensitized solar cells to enhance device performance [42]. TiCl 4 treatment has also been applied in PSC devices to fill the voids at the TiO 2 /perovskite layer interfaces and smooth the TiO 2 surface [39,43,44].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Perovskite Solar Cell Performance through Surface Engineering of Metal Oxide Electron-Transporting Layer

Lü

Wang²,

Du³

et al. 2020

Coatings

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Perovskite solar cells have gained increasing interest in recent times owing to the rapidly enlarged device efficiency and tunable optoelectronic properties in various applications. In perovskite solar cells, interface engineering plays an important role in determining the final device efficiency and stability. In this study, we adopted TiCl4 treatment to reduce the surface roughness of the metal oxide layer and improve the perovskite film quality to obtain better device performance. After proper TiCl4 treatment, the efficiencies of TiCl4–TiO2- and TiCl4–ZnO-based devices were significantly enhanced up to 16.5% and 17.0%, respectively, compared with those based on pristine TiO2 and ZnO (13.2% and 10.2%, respectively).

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Influence of the concentration of TiCl4 solution used for post-treatment on mesoporous TiO2 layers in hybrid lead halide perovskite solar cells

Cited by 8 publications

References 54 publications

Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Engineering of the Electron Transport Layer/Perovskite Interface in Solar Cells Designed on TiO₂ Rutile Nanorods

Enhancing Perovskite Solar Cell Performance through Surface Engineering of Metal Oxide Electron-Transporting Layer

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Influence of the concentration of TiCl4 solution used for post-treatment on mesoporous TiO2 layers in hybrid lead halide perovskite solar cells

Cited by 8 publications

References 54 publications

Preferentially oriented TiO2 nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Preferentially oriented TiO2 nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Engineering of the Electron Transport Layer/Perovskite Interface in Solar Cells Designed on TiO2 Rutile Nanorods

Enhancing Perovskite Solar Cell Performance through Surface Engineering of Metal Oxide Electron-Transporting Layer

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Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Preferentially oriented TiO₂ nanotube arrays on non-native substrates and their improved performance as electron transporting layer in halide perovskite solar cells

Engineering of the Electron Transport Layer/Perovskite Interface in Solar Cells Designed on TiO₂ Rutile Nanorods