Hydrolysis-Regulated Chemical Bath Deposition of Tin-Oxide-Based Electron Transport Layers for Efficient Perovskite Solar Cells with a Reduced Potential Loss

Seungkyu Kim, Yong Ju Yun, Taemin Kim, Chanyong Lee, Yohan Ko, Yongseok Jun

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The high electron mobility, wide band gap, and chemical stability of n-type SnO2 have facilitated its use as an ideal electron transport layer (ETL) for perovskite solar cells (PSCs). However, the tendency of SnO2 to aggregate during film formation leads to poor morphology and low reproducibility. Despite important advances in the application of SnO2 for PSCs, a thorough understanding of material control over aggregation is lacking. Herein, aggregation-regulated SnO2 films are directly deposited on a fluorine-doped tin oxide glass surface via chemical bath deposition using retarding agents with multiple functional OH groups. Density functional theory calculations confirm the increase in stabilized binding energies of the Sn precursors by the retarding agents. Investigation of the morphology and topography of the SnO2 films reveals that manipulating the physicochemical properties of interacting molecules regulates SnO2 particle aggregation. The chemical states and energy-band properties of the fabricated SnO2 films are found to depend on the retarding agent used in the Sn precursors. The aggregation-regulated SnO2 layer prepared using glycerol exhibits an optimal morphology, a few oxygen vacancies, and a high work-function energy level. A device fabricated using the glycerol-SnO2 film as an ETL achieves a high efficiency of 21.8%, negligible hysteresis, and a reduced potential loss.

Original languageEnglish
Pages (from-to)8194-8204
Number of pages11
JournalChemistry of Materials
Volume33
Issue number21
DOIs
Publication statusPublished - 2021 Nov 9

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (2020R1A2C1101085 and NRF-2017M1A2A2087351) and the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through the Smart Farm Innovation Technology Development Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA) and the Ministry of Science and ICT (MSIT), Rural Development Administration (RDA) (421036-03)

Publisher Copyright:
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ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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