Why lead methylammonium tri-iodide perovskite-based solar cells require a mesoporous electron transporting scaffold (but not necessarily a hole conductor)

Eran Edri; Saar Kirmayer; Alex Henning; Sabyasachi Mukhopadhyay; Konstantin Gartsman; Yossi Rosenwaks; Gary Hodes; David Cahen

doi:10.1021/nl404454h

Why lead methylammonium tri-iodide perovskite-based solar cells require a mesoporous electron transporting scaffold (but not necessarily a hole conductor)

Nano Lett. 2014 Feb 12;14(2):1000-4. doi: 10.1021/nl404454h. Epub 2014 Jan 31.

Authors

Eran Edri¹, Saar Kirmayer, Alex Henning, Sabyasachi Mukhopadhyay, Konstantin Gartsman, Yossi Rosenwaks, Gary Hodes, David Cahen

Affiliation

¹ Department of Materials and Interfaces, Faculty of Chemistry, Weizmann Institute of Science , 76100, Rehovot, Israel.

PMID: 24475878
DOI: 10.1021/nl404454h

Abstract

CH3NH3PbI3-based solar cells were characterized with electron beam-induced current (EBIC) and compared to CH3NH3PbI(3-x)Clx ones. A spatial map of charge separation efficiency in working cells shows p-i-n structures for both thin film cells. Effective diffusion lengths, LD, (from EBIC profile) show that holes are extracted significantly more efficiently than electrons in CH3NH3PbI3, explaining why CH3NH3PbI3-based cells require mesoporous electron conductors, while CH3NH3PbI(3-Clx ones, where LD values are comparable for both charge types, do not.

Publication types

Research Support, Non-U.S. Gov't