Band Alignment Engineering between Planar SnO2 and Halide Perovskites via Two-Step Annealing

Jung Hwan Lee, Dongguen Shin, Ryan Rhee, Sangeun Yun, Kyung Mun Yeom, Do Hyung Chun, Sunje Lee, Dongho Kim, Yeonjin Yi, Jun Hong Noh, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Managing defects in SnO2 is critical for improving the power conversion efficiency (PCE) of halide perovskite-based solar cells. However, typically reported SnO2-based perovskite solar cells have inherent defects in the SnO2 layer, which lead to a lower PCE and hysteresis. Here, we report that a dual-coating approach for SnO2 with different annealing temperatures can simultaneously form a SnO2 layer with high crystallinity and uniform surface coverage. Along with these enhanced physical properties, the dual-coated SnO2 layer shows favorable band alignment with a mixed halide perovskite. After careful optimization of the dual-coating method, the average PCE of the perovskite solar cell based on the dual-coated SnO2 layer increases from 18.07 to 19.23% with a best-performing cell of 20.03%. Note that a facile two-step coating and annealing method can open new avenues to develop SnO2-based perovskite solar cells with stabilized and improved photovoltaic performances.

Original languageEnglish
Pages (from-to)6545-6550
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number21
Publication statusPublished - 2019 Nov 7

Bibliographical note

Publisher Copyright:
Copyright © 2019 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry


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