Perovskite Solar Cells Employing Dopant-Free Organic Hole Transport Materials with Tunable Energy Levels

Yongsheng Liu; Ziruo Hong; Qi Chen; Huajun Chen; Wei-Hsuan Chang; Yang Michael Yang; Tze-Bin Song; Yang Yang

doi:10.1002/adma.201504293

Perovskite Solar Cells Employing Dopant-Free Organic Hole Transport Materials with Tunable Energy Levels

Adv Mater. 2016 Jan 20;28(3):440-6. doi: 10.1002/adma.201504293. Epub 2015 Nov 20.

Authors

Yongsheng Liu^{1

2}, Ziruo Hong¹, Qi Chen^{1

2}, Huajun Chen¹, Wei-Hsuan Chang^{1

2}, Yang Michael Yang¹, Tze-Bin Song^{1

2}, Yang Yang^{1

2}

Affiliations

¹ Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
² California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.

PMID: 26588665
DOI: 10.1002/adma.201504293

Abstract

Conjugated small-molecule hole-transport materials (HTMs) with tunable energy levels are designed and synthesized for efficient perovskite solar cells. A champion device with efficiency of 16.2% is demonstrated using a dopant-free DERDTS-TBDT HTM, while the DORDTS-DFBT-HTM-based device shows an inferior performance of 6.2% due to its low hole mobility and unmatched HOMO level with the valence band of perovskite film.

Keywords: charge transport; dopant-free small molecules; hole conductors; perovskite; solar cells.