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Elucidating the charge carrier separation and working mechanism of CH3NH3PbI3−xClx perovskite solar cells

Author

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  • Eran Edri

    (Faculty of Chemistry, Weizmann Institute of Science)

  • Saar Kirmayer

    (Faculty of Chemistry, Weizmann Institute of Science)

  • Sabyasachi Mukhopadhyay

    (Faculty of Chemistry, Weizmann Institute of Science)

  • Konstantin Gartsman

    (Faculty of Chemistry, Weizmann Institute of Science)

  • Gary Hodes

    (Faculty of Chemistry, Weizmann Institute of Science)

  • David Cahen

    (Faculty of Chemistry, Weizmann Institute of Science)

Abstract

Developments in organic–inorganic lead halide-based perovskite solar cells have been meteoric over the last 2 years, with small-area efficiencies surpassing 15%. We address the fundamental issue of how these cells work by applying a scanning electron microscopy-based technique to cell cross-sections. By mapping the variation in efficiency of charge separation and collection in the cross-sections, we show the presence of two prime high efficiency locations, one at/near the absorber/hole-blocking-layer, and the second at/near the absorber/electron-blocking-layer interfaces, with the former more pronounced. This ‘twin-peaks’ profile is characteristic of a p–i–n solar cell, with a layer of low-doped, high electronic quality semiconductor, between a p- and an n-layer. If the electron blocker is replaced by a gold contact, only a heterojunction at the absorber/hole-blocking interface remains.

Suggested Citation

  • Eran Edri & Saar Kirmayer & Sabyasachi Mukhopadhyay & Konstantin Gartsman & Gary Hodes & David Cahen, 2014. "Elucidating the charge carrier separation and working mechanism of CH3NH3PbI3−xClx perovskite solar cells," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4461
    DOI: 10.1038/ncomms4461
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    Cited by:

    1. Pengju Shi & Jiazhe Xu & Ilhan Yavuz & Tianyi Huang & Shaun Tan & Ke Zhao & Xu Zhang & Yuan Tian & Sisi Wang & Wei Fan & Yahui Li & Donger Jin & Xuemeng Yu & Chenyue Wang & Xingyu Gao & Zhong Chen & E, 2024. "Strain regulates the photovoltaic performance of thick-film perovskites," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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