Perovskite Solar Cells Employing Dopant-Free Organic Hole Transport Materials with Tunable Energy Levels
Journal article published in 2015 by
Yongsheng Liu 
,
Ziruo Hong,
Qi Chen,
Huajun Chen,
Wei-Hsuan Chang,
Yang Michael Yang,
Tze Bin Song,
Tze-Bin Song,
Yang Yang
,
Ziruo Hong,
Qi Chen,
Huajun Chen,
Wei-Hsuan Chang,
Yang Michael Yang,
Tze Bin Song,
Tze-Bin Song,
Yang Yang
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Abstract
Conjugated small molecule hole transport materials (HTMs) with tunable energy levels have been designed and synthesized for efficient perovskite solar cells. A champion device with efficiency of 16.2% has been demonstrated using our 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 valence band of perovskite film.