Low-Temperature-Processed Brookite-Based TiO2 Heterophase Junction Enhances Performance of Planar Perovskite Solar Cells

Md Shahiduzzaman, Sem Visal, Mizuki Kuniyoshi, Tetsuya Kaneko, Shinjiro Umezu, Tetsuhiro Katsumata, Satoru Iwamori, Masato Kakihana, Tetsuya Taima, Masao Isomura, Koji Tomita

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    In the design of electron-transport layers (ETLs) to enhance the efficiency of planar perovskite solar cells (PSCs), facile electron extraction and transport are important features. Here, we consider the effects of different titanium oxide (TiO2) polymorphs, anatase and brookite. We design and fabricate high-phase-purity, single-crystalline, highly conductive, and low-temperature (<180 °C)-processed brookite-based TiO2 heterophase junctions on fluorine-doped tin oxide (FTO) as the substrate. We test and compare single-phase anatase (A) and brookite (B) and heterophase anatase-brookite (AB) and brookite-anatase (BA) as ETLs in PSCs. The power-conversion efficiencies (PCEs) of PSCs with low-temperature-processed single-layer FTO-B as the ETL were as high as 14.92%, which is the highest reported efficiency of FTO-B-based single-layer PSC. This implies that FTO-B serves as an active phase and can be a potential candidate as an n-type ETL scaffold in planar PSCs. Moreover, the surface of highly crystalline brookite TiO2 exhibits a tendency toward interparticle necking, leading to the formation of compact scaffolds. Furthermore, PSCs with heterophase junction FTO-AB ETLs exhibited PCEs as high as 16.82%, which is superior to those of PSCs with single-phase anatase (FTO-A) and brookite (FTO-B) as the ETLs (13.86% and 14.92%, respectively). In addition, the PSCs with FTO-AB exhibited improved efficiency and decreased hysteresis compared with those with FTO-BA (13.45%) due to the suitable band alignment with the perovskite layer, which resulted in superior photogenerated charge-carrier extraction and reduced charge accumulation at the interface between the heterophase junction and perovskite. Thus, the present work presents an effective strategy by which to develop heterophase junction ETLs and manipulate the interfacial energy band to further improve the performance of planar PSCs and enable the clean and eco-friendly fabrication of low-cost mass production.

    Original languageEnglish
    Pages (from-to)598-604
    Number of pages7
    JournalNano Letters
    Volume19
    Issue number1
    DOIs
    Publication statusPublished - 2019 Jan 9

    Fingerprint

    Tin oxides
    Fluorine
    Titanium dioxide
    solar cells
    anatase
    tin oxides
    fluorine
    electrons
    Temperature
    Scaffolds
    Perovskite
    Conversion efficiency
    Crystalline materials
    Perovskite solar cells
    titanium dioxide
    Titanium oxides
    interfacial energy
    Electron Transport
    Polymorphism
    Charge carriers

    Keywords

    • brookite TiO nanoparticles
    • Low-temperature processing
    • planar perovskite solar cells
    • TiO heterophase junction

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

    Cite this

    Low-Temperature-Processed Brookite-Based TiO2 Heterophase Junction Enhances Performance of Planar Perovskite Solar Cells. / Shahiduzzaman, Md; Visal, Sem; Kuniyoshi, Mizuki; Kaneko, Tetsuya; Umezu, Shinjiro; Katsumata, Tetsuhiro; Iwamori, Satoru; Kakihana, Masato; Taima, Tetsuya; Isomura, Masao; Tomita, Koji.

    In: Nano Letters, Vol. 19, No. 1, 09.01.2019, p. 598-604.

    Research output: Contribution to journalArticle

    Shahiduzzaman, M, Visal, S, Kuniyoshi, M, Kaneko, T, Umezu, S, Katsumata, T, Iwamori, S, Kakihana, M, Taima, T, Isomura, M & Tomita, K 2019, 'Low-Temperature-Processed Brookite-Based TiO2 Heterophase Junction Enhances Performance of Planar Perovskite Solar Cells', Nano Letters, vol. 19, no. 1, pp. 598-604. https://doi.org/10.1021/acs.nanolett.8b04744
    Shahiduzzaman, Md ; Visal, Sem ; Kuniyoshi, Mizuki ; Kaneko, Tetsuya ; Umezu, Shinjiro ; Katsumata, Tetsuhiro ; Iwamori, Satoru ; Kakihana, Masato ; Taima, Tetsuya ; Isomura, Masao ; Tomita, Koji. / Low-Temperature-Processed Brookite-Based TiO2 Heterophase Junction Enhances Performance of Planar Perovskite Solar Cells. In: Nano Letters. 2019 ; Vol. 19, No. 1. pp. 598-604.
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    AU - Shahiduzzaman, Md

    AU - Visal, Sem

    AU - Kuniyoshi, Mizuki

    AU - Kaneko, Tetsuya

    AU - Umezu, Shinjiro

    AU - Katsumata, Tetsuhiro

    AU - Iwamori, Satoru

    AU - Kakihana, Masato

    AU - Taima, Tetsuya

    AU - Isomura, Masao

    AU - Tomita, Koji

    PY - 2019/1/9

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    N2 - In the design of electron-transport layers (ETLs) to enhance the efficiency of planar perovskite solar cells (PSCs), facile electron extraction and transport are important features. Here, we consider the effects of different titanium oxide (TiO2) polymorphs, anatase and brookite. We design and fabricate high-phase-purity, single-crystalline, highly conductive, and low-temperature (<180 °C)-processed brookite-based TiO2 heterophase junctions on fluorine-doped tin oxide (FTO) as the substrate. We test and compare single-phase anatase (A) and brookite (B) and heterophase anatase-brookite (AB) and brookite-anatase (BA) as ETLs in PSCs. The power-conversion efficiencies (PCEs) of PSCs with low-temperature-processed single-layer FTO-B as the ETL were as high as 14.92%, which is the highest reported efficiency of FTO-B-based single-layer PSC. This implies that FTO-B serves as an active phase and can be a potential candidate as an n-type ETL scaffold in planar PSCs. Moreover, the surface of highly crystalline brookite TiO2 exhibits a tendency toward interparticle necking, leading to the formation of compact scaffolds. Furthermore, PSCs with heterophase junction FTO-AB ETLs exhibited PCEs as high as 16.82%, which is superior to those of PSCs with single-phase anatase (FTO-A) and brookite (FTO-B) as the ETLs (13.86% and 14.92%, respectively). In addition, the PSCs with FTO-AB exhibited improved efficiency and decreased hysteresis compared with those with FTO-BA (13.45%) due to the suitable band alignment with the perovskite layer, which resulted in superior photogenerated charge-carrier extraction and reduced charge accumulation at the interface between the heterophase junction and perovskite. Thus, the present work presents an effective strategy by which to develop heterophase junction ETLs and manipulate the interfacial energy band to further improve the performance of planar PSCs and enable the clean and eco-friendly fabrication of low-cost mass production.

    AB - In the design of electron-transport layers (ETLs) to enhance the efficiency of planar perovskite solar cells (PSCs), facile electron extraction and transport are important features. Here, we consider the effects of different titanium oxide (TiO2) polymorphs, anatase and brookite. We design and fabricate high-phase-purity, single-crystalline, highly conductive, and low-temperature (<180 °C)-processed brookite-based TiO2 heterophase junctions on fluorine-doped tin oxide (FTO) as the substrate. We test and compare single-phase anatase (A) and brookite (B) and heterophase anatase-brookite (AB) and brookite-anatase (BA) as ETLs in PSCs. The power-conversion efficiencies (PCEs) of PSCs with low-temperature-processed single-layer FTO-B as the ETL were as high as 14.92%, which is the highest reported efficiency of FTO-B-based single-layer PSC. This implies that FTO-B serves as an active phase and can be a potential candidate as an n-type ETL scaffold in planar PSCs. Moreover, the surface of highly crystalline brookite TiO2 exhibits a tendency toward interparticle necking, leading to the formation of compact scaffolds. Furthermore, PSCs with heterophase junction FTO-AB ETLs exhibited PCEs as high as 16.82%, which is superior to those of PSCs with single-phase anatase (FTO-A) and brookite (FTO-B) as the ETLs (13.86% and 14.92%, respectively). In addition, the PSCs with FTO-AB exhibited improved efficiency and decreased hysteresis compared with those with FTO-BA (13.45%) due to the suitable band alignment with the perovskite layer, which resulted in superior photogenerated charge-carrier extraction and reduced charge accumulation at the interface between the heterophase junction and perovskite. Thus, the present work presents an effective strategy by which to develop heterophase junction ETLs and manipulate the interfacial energy band to further improve the performance of planar PSCs and enable the clean and eco-friendly fabrication of low-cost mass production.

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    KW - TiO heterophase junction

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