Retarding Crystallization during Facile Single Coating of NaCl-Incorporated Precursor Solution for Efficient Large-Area Uniform Perovskite Solar Cells

Hongseuk Lee; Areum Kim; Hyeok-Chan Kwon; Wooseok Yang; Yunjung Oh; Daehee Lee; Jooho Moon

doi:10.1021/acsami.6b08783

Retarding Crystallization during Facile Single Coating of NaCl-Incorporated Precursor Solution for Efficient Large-Area Uniform Perovskite Solar Cells

ACS Appl Mater Interfaces. 2016 Nov 2;8(43):29419-29426. doi: 10.1021/acsami.6b08783. Epub 2016 Oct 21.

Authors

Hongseuk Lee¹, Areum Kim¹, Hyeok-Chan Kwon¹, Wooseok Yang¹, Yunjung Oh¹, Daehee Lee¹, Jooho Moon¹

Affiliation

¹ Department of Materials Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea.

PMID: 27731622
DOI: 10.1021/acsami.6b08783

Abstract

We demonstrated crystallization retardation of CH₃NH₃PbI₃ thin film during single coating of precursor solution by simple addition of NaCl. NaCl was codissolved into a precursor mixture solution containing PbI₂ and methylammonium iodide (MAI). Dissolved NaCl interacted with the PbI₂ in solution and produced a stable intermediate phase, which was converted to a full-coverage uniform perovskite absorber layer via reaction with MAI during a single spin-coating. The resulting planar-structure perovskite solar cell made from NaCl-supplemented precursor solution showed a 48% improvement in power conversion efficiency (PCE) (maximum value 15.16%) over the device fabricated without the additive. Our NaCl-supplemented single coating represents an easy approach to effectively obtain highly reproducible uniform performance at an overall position in 5 cm × 5 cm sized cells (divided into 20 subcells with an active area of 0.06 cm²) with average PCEs of 12.00 ± 0.48%.

Keywords: NaCl additive; film morphology; large-area fabrication; perovskite solar cells; single coating.