Epitaxial 1D electron transport layers for high-performance perovskite solar cells

Gill Sang Han, Hyun Suk Chung, Dong Hoe Kim, Byeong Jo Kim, Jin Wook Lee, Nam Gyu Park, In Sun Cho, Jung Kun Lee, Sangwook Lee, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

We demonstrate high-performance perovskite solar cells with excellent electron transport properties using a one-dimensional (1D) electron transport layer (ETL). The 1D array-based ETL is comprised of 1D SnO2 nanowires (NWs) array grown on a F:SnO2 transparent conducting oxide substrate and rutile TiO2 nanoshells epitaxially grown on the surface of the 1D SnO2 NWs. The optimized devices show more than 95% internal quantum yield at 750 nm, and a power conversion efficiency (PCE) of 14.2%. The high quantum yield is attributed to dramatically enhanced electron transport in the epitaxial TiO2 layer, compared to that in conventional nanoparticle-based mesoporous TiO2 (mp-TiO2) layers. In addition, the open space in the 1D array-based ETL increases the prevalence of uniform TiO2/perovskite junctions, leading to reproducible device performance with a high fill factor. This work offers a method to achieve reproducible, high-efficiency perovskite solar cells with high-speed electron transport.

Original languageEnglish
Pages (from-to)15284-15290
Number of pages7
JournalNanoscale
Volume7
Issue number37
DOIs
Publication statusPublished - 2015 Oct 7
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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