Low temperature solution processable TiO 2 nano-sol for electron transporting layer of flexible perovskite solar cells

Myung Sang You, Jin Hyuck Heo, Jin Kyoung Park, Sang Hwa Moon, Bum Jun Park, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Low-temperature solution processable TiO 2 nano-sol for electron transporting layer (ETL) of flexible perovskite solar cells is prepared by synthesizing TiO 2 nano-sols by peptization in acidic aqueous solution and re-dispersing the TiO 2 nanoparticles in H 2 O, ethanol (EtOH), dimethylsulfoxied (DMSO), and N,N-dimethylformamide (DMF). By considering dielectric constant, zeta potential, and surface tension of solvent media, we found that the DMF is the best to form uniform TiO 2 ETL by spin-coating among them because it has low surface tension and high zeta potential. Accordingly, we could demonstrate 18.2% power conversion efficiency (PCE) for rigid glass substrate based perovskite solar cells and 15.8% PCE for flexible polymer substrate based devices by low-temperature solution process.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume194
DOIs
Publication statusPublished - 2019 Jun 1

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program (No. 2014R1A5A1009799 ), the Technology Development Program to Solve Climate Change (No. 2015M1A2A2055631 ), and Nano-Material Technology Development Program (No. 2017M3A7B4041696 )) and the Ministry of Trade, Industry and Energy , Republic of Korea (New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20183010013820 ).

Publisher Copyright:
© 2019

Keywords

  • Electron transporting layer
  • Low temperature
  • Perovskite solar cells
  • Solution process
  • TiO nano-sol

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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