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Understanding how excess lead iodide precursor improves halide perovskite solar cell performance

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  • Byung-wook Park

    (Ulsan National Institute of Science and Technology (UNIST))

  • Nir Kedem

    (Weizmann Institute of Science)

  • Michael Kulbak

    (Weizmann Institute of Science)

  • Do Yoon Lee

    (Ulsan National Institute of Science and Technology (UNIST))

  • Woon Seok Yang

    (Ulsan National Institute of Science and Technology (UNIST))

  • Nam Joong Jeon

    (Korea Research Institute of Chemical Technology (KRICT))

  • Jangwon Seo

    (Korea Research Institute of Chemical Technology (KRICT))

  • Geonhwa Kim

    (Pohang University of Science and Technology (POSTECH)
    Gwangju Institute of Science and Technology (GIST))

  • Ki Jeong Kim

    (Pohang University of Science and Technology (POSTECH))

  • Tae Joo Shin

    (Ulsan National Institute of Science and Technology (UNIST))

  • Gary Hodes

    (Weizmann Institute of Science)

  • David Cahen

    (Weizmann Institute of Science)

  • Sang Il Seok

    (Ulsan National Institute of Science and Technology (UNIST))

Abstract

The presence of excess lead iodide in halide perovskites has been key for surpassing 20% photon-to-power conversion efficiency. To achieve even higher power conversion efficiencies, it is important to understand the role of remnant lead iodide in these perovskites. To that end, we explored the mechanism facilitating this effect by identifying the impact of excess lead iodide within the perovskite film on charge diffusion length, using electron-beam-induced current measurements, and on film formation properties, from grazing-incidence wide-angle X-ray scattering and high-resolution transmission electron microscopy. Based on our results, we propose that excess lead iodide in the perovskite precursors can reduce the halide vacancy concentration and lead to formation of azimuthal angle-oriented cubic α-perovskite crystals in-between 0° and 90°. We further identify a higher perovskite carrier concentration inside the nanostructured titanium dioxide layer than in the capping layer. These effects are consistent with enhanced lead iodide-rich perovskite solar cell performance and illustrate the role of lead iodide.

Suggested Citation

  • Byung-wook Park & Nir Kedem & Michael Kulbak & Do Yoon Lee & Woon Seok Yang & Nam Joong Jeon & Jangwon Seo & Geonhwa Kim & Ki Jeong Kim & Tae Joo Shin & Gary Hodes & David Cahen & Sang Il Seok, 2018. "Understanding how excess lead iodide precursor improves halide perovskite solar cell performance," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05583-w
    DOI: 10.1038/s41467-018-05583-w
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    Cited by:

    1. Woongchan Lee & Young Jin Yoo & Jinhong Park & Joo Hwan Ko & Yeong Jae Kim & Huiwon Yun & Dong Hoe Kim & Young Min Song & Dae-Hyeong Kim, 2022. "Perovskite microcells fabricated using swelling-induced crack propagation for colored solar windows," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Hasitha C. Weerasinghe & Nasiruddin Macadam & Jueng-Eun Kim & Luke J. Sutherland & Dechan Angmo & Leonard W. T. Ng & Andrew D. Scully & Fiona Glenn & Regine Chantler & Nathan L. Chang & Mohammad Dehgh, 2024. "The first demonstration of entirely roll-to-roll fabricated perovskite solar cell modules under ambient room conditions," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    3. Julian A. Steele & Tom Braeckevelt & Vittal Prakasam & Giedrius Degutis & Haifeng Yuan & Handong Jin & Eduardo Solano & Pascal Puech & Shreya Basak & Maria Isabel Pintor-Monroy & Hans Gorp & Guillaume, 2022. "An embedded interfacial network stabilizes inorganic CsPbI3 perovskite thin films," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    4. Shuxian Du & Hao Huang & Zhineng Lan & Peng Cui & Liang Li & Min Wang & Shujie Qu & Luyao Yan & Changxu Sun & Yingying Yang & Xinxin Wang & Meicheng Li, 2024. "Inhibiting perovskite decomposition by a creeper-inspired strategy enables efficient and stable perovskite solar cells," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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