Retarding charge recombination in perovskite solar cells using ultrathin MgO-coated TiO2 nanoparticulate films

Gill Sang Han, Hyun Suk Chung, Byeong Jo Kim, Dong Hoe Kim, Jin Wook Lee, Bhabani Sankar Swain, Khalid Mahmood, Jin Sun Yoo, Nam Gyu Park, Jung Heon Lee, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

144 Citations (Scopus)

Abstract

MgO-coated TiO2 nanoparticle (NP)-based electron collecting layers were fabricated to prevent charge recombination at the methylamine lead iodide/TiO2 interface in perovskite solar cells. The open circuit voltage (Voc) and fill factor (ff) of perovskite solar cells based on MgO-coated TiO2 charge collectors were 0.89 V and 71.2%, respectively. These values were 4.7% and 6.1% higher than the pure TiO2 based perovskite solar cells. Transient photovoltage decay data exhibited recombination times for MgO-coated TiO2 NP-based perovskite solar cells about three times longer than those of TiO2 NP based solar cells. The longer recombination time was responsible for enhancing the Voc and ff of MgO-coated TiO2 NP-based perovskite solar cells. By employing a MgO nanolayer, we observed that the power conversion efficiency (PCE) was increased from 11.4% to 12.7%, demonstrating that MgO ultrathin nanolayers are able to efficiently retard charge recombination in perovskite solar cells.

Original languageEnglish
Pages (from-to)9160-9164
Number of pages5
JournalJournal of Materials Chemistry A
Volume3
Issue number17
DOIs
Publication statusPublished - 2015 May 7
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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