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

Eran Edri, Saar Kirmayer, Sabyasachi Mukhopadhyay, Konstantin Gartsman, Gary Hodes and David Cahen ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4461

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