CH3NH3PbI3 from non-iodide lead salts for perovskite solar cells via the formation of PbI2

Ganapathy Balaji; Pranav H. Joshi; Hisham A. Abbas; Liang Zhang; Ranjith Kottokkaran; Mehran Samiee; Max Noack; Vikram L. Dalal

doi:10.1039/C5CP00073D

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CH₃NH₃PbI₃ from non-iodide lead salts for perovskite solar cells via the formation of PbI₂†

Ganapathy Balaji,*^a Pranav H. Joshi,^b Hisham A. Abbas,^b Liang Zhang,^b Ranjith Kottokkaran,^a Mehran Samiee,^b Max Noack^a and Vikram L. Dalal^a

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* Corresponding authors

^a Microelectronics Research Centre, Iowa State University, Ames, Iowa, USA
E-mail: g.balaj@gmail.com

^b Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa, USA

Abstract

We report the formation of CH₃NH₃PbI₃ from more soluble, non-iodide lead salts like Pb(SCN)₂ and Pb(NO₃)₂. When exposed to CH₃NH₃I vapours, the colourless lead salts turned yellow before the formation of the black perovskite. Investigation of this yellow intermediate suggests that anion exchange (converting lead salts to PbI₂) precedes the perovskite formation. PCEs of 7.6% and 8.4% were achieved for the devices formed from Pb(SCN)₂ and Pb(NO₃)₂, respectively.

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Article information

DOI: https://doi.org/10.1039/C5CP00073D
Article type: Communication
Submitted: 06 Jan 2015
Accepted: 19 Mar 2015
First published: 25 Mar 2015

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Phys. Chem. Chem. Phys., 2015,17, 10369-10372

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CH₃NH₃PbI₃ from non-iodide lead salts for perovskite solar cells via the formation of PbI₂

G. Balaji, P. H. Joshi, H. A. Abbas, L. Zhang, R. Kottokkaran, M. Samiee, M. Noack and V. L. Dalal, Phys. Chem. Chem. Phys., 2015, 17, 10369 DOI: 10.1039/C5CP00073D

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