Thermally induced structural evolution and performance of mesoporous block copolymer-directed alumina perovskite solar cells.

Kwan Wee Tan, David J. Moore, Michael Saliba, Hiroaki Sai, Lara A Estroff, Tobias Hanrath, Henry J Snaith, Ulrich Wiesner

Research output: Contribution to journalArticlepeer-review

220 Scopus citations

Abstract

Structure control in solution-processed hybrid perovskites is crucial to design and fabricate highly efficient solar cells. Here, we utilize in situ grazing incidence wide-angle X-ray scattering and scanning electron microscopy to investigate the structural evolution and film morphologies of methylammonium lead tri-iodide/chloride (CH3NH3PbI(3-x)Cl(x)) in mesoporous block copolymer derived alumina superstructures during thermal annealing. We show the CH3NH3PbI(3-x)Cl(x) material evolution to be characterized by three distinct structures: a crystalline precursor structure not described previously, a 3D perovskite structure, and a mixture of compounds resulting from degradation. Finally, we demonstrate how understanding the processing parameters provides the foundation needed for optimal perovskite film morphology and coverage, leading to enhanced block copolymer-directed perovskite solar cell performance.
Original languageEnglish (US)
Pages (from-to)4730-4739
Number of pages10
JournalACS Nano
Volume8
Issue number5
DOIs
StatePublished - Apr 11 2014
Externally publishedYes

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