title: Perovskite Solar Cells Employing Dopant-Free Organic Hole Transport Materials with Tunable Energy Levels.
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.
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.|California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Ziruo
authors.initials: Z
authors.lastname: Hong
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.|California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Huajun
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.|California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Wei-Hsuan
authors.initials: WH
authors.lastname: Chang
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Yang Michael
authors.initials: YM
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.|California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Tze-Bin
authors.initials: TB
authors.lastname: Song
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.|California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
keywords: charge transport; dopant-free small molecules; hole conductors; perovskite; solar cells