Acetylacetone modulated TiO2 nanoparticles for low-temperature solution processable perovskite solar cell

Seok Yeong Hong, Hyong Joon Lee, Jin Kyoung Park, Jin Hyuck Heo, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


TiO2 has been widely adopted as an electron transport layer during the fabrication of efficient metal halide perovskite solar cells (MHP-SCs). In this study, we prepared acetylacetone (Acac)-modulated TiO2 nanoparticles (NPs) suitable for low-temperature solution processing via the sol-gel method. Acac coordinates with TiO2 NPs and preferably passivates surface trap states which are detrimental to photovoltaic performance. Moreover, the Acac-TiO2 NPs establish a favorable band alignment for charge extraction by donating the lone pair electron. As a result, Acac-TiO2 NPs based MHP-SCs exhibit an outstanding power conversion efficiency (PCE) of 21.20% attributed to facilitated charge extraction and reduced defect density. Furthermore, by implementing low-temperature solution-processable Acac-TiO2 NPs, we successfully demonstrated a remarkable PCE of 18.01% along with excellent mechanical stability, retaining 74.5% and 67.1% PCE after 5000 bending cycles in outward and inward directions from Acac-TiO2 NPs based MHP-SCs on a flexible substrate.

Original languageEnglish
Pages (from-to)22819-22831
Number of pages13
JournalInternational Journal of Energy Research
Issue number15
Publication statusPublished - 2022 Dec

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. 2021R1A5A6002853], [No. 2022R1A2C3004964], [No. 2022R1C1C2008126]).

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.


  • TiO
  • acetylacetone
  • flexible
  • low temperature
  • perovskite
  • solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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