Impact of Ternary Solvent on the Grain Size and Defects of Perovskite Layer to Realize a Stable Morphology for Efficient Inverted Solar Cells

Chang Min Lee, Syed Hamad Ullah Shah, Keum Jin Ko, Dong Hyun Kim, Tae Wook Kim, Hyun Woo Cho, Yeong Beom Kim, Jae Woo Lee, Kiseok Heo, Chul Hoon Kim, Hyun Jae Lee, Gyudo Lee, Seokbeom Roh, Sanghyuk Park, Sang Geul Lee, Tae Sung Bae, Seung Min Yu, Jong Sung Jin, Heehun Moon, Amjad IslamP. Justin Jesuraj, Myungkwan Song, Chang Su Kim, Seung Yoon Ryu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Recent reports reveal that a smooth and uniform surface morphology can endow perovskite solar cells with excellent stability and remarkable power conversion efficiency (PCE). Herein, a ternary solvent strategy is employed using dimethylformamide (DMF), dimethyl-sulfoxide (DMSO), and γ-butyrolactone (GBL) to improve contact between the charge transporting layers and the perovskite layer. This approach yields enhanced surface morphology, charge extraction, and passivation. The thermally stable intermediates generated through the ternary solvent promote uniform MAPbI3 films with a smooth surface. These intermediates reduce surface roughness, increase grain size, and fill voids or defects in MAPbI3 due to a strong interaction of ternary solvent. The PCE with the ternary solvent (DMF:GBL:DMSO) increases to 20.23% compared to binary solvents of GBL:DMSO and DMF:DMSO. Additionally, ternary solvent engineering is beneficial from an industrial perspective for achieving a stable and uniform morphology of perovskite in large-area device fabrication.

Original languageEnglish
Article number2300604
JournalSolar RRL
Volume7
Issue number23
DOIs
StatePublished - Dec 2023

Keywords

  • intermediate states
  • inverted perovskite solar cells
  • perovskite crystal growth
  • solvent engineering
  • ternary solutions

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