TY - JOUR
T1 - Elucidating the charge carrier separation and working mechanism of CH 3 NH 3 PbI 3-x Cl x perovskite solar cells
AU - Edri, Eran
AU - Kirmayer, Saar
AU - Mukhopadhyay, Sabyasachi
AU - Gartsman, Konstantin
AU - Hodes, Gary
AU - Cahen, David
N1 - Funding Information:
We thank the Leona M. and Harry B. Helmsley Charitable Trust, the Weizmann-UK Joint Research Program, the Israel Ministry of Science’s ‘Tashtiot’ program, Mr Martin Kushner Schnur and the Nancy and Stephen Grand Center for Sensors and Security, for partial support. S.M. thanks PBC Program of the Israel Council for Higher Education for a fellowship. D.C. holds the Sylvia and Rowland Schaefer Chair in Energy research.
PY - 2014/3/11
Y1 - 2014/3/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84896371689&partnerID=8YFLogxK
U2 - 10.1038/ncomms4461
DO - 10.1038/ncomms4461
M3 - Article
C2 - 24613942
AN - SCOPUS:84896371689
SN - 2041-1723
VL - 5
JO - Nature Communications
JF - Nature Communications
M1 - 3461
ER -
