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  • Perovskite Solar Cells Empl...
    Liu, Yongsheng; Hong, Ziruo; Chen, Qi; Chen, Huajun; Chang, Wei-Hsuan; Yang, Yang (Michael); Song, Tze-Bin; Yang, Yang

    Advanced materials, January 20, 2016, Volume: 28, Issue: 3
    Journal Article

    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.