Planar core based starburst triphenylamine molecules as hole transporting materials for high-performance perovskite solar cells

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 5-6
• 页数: 2页
• 语种: 英文

摘要

Starburst triphenylamine molecules are generally used as hole transporting materials (HTMs) for optoelectronic devices like solar cells,light emitting diode and field effect transistors [1].The use of starburst triphenylamine molecules like spiro-OMeTAD HTM initiated the construction of solid state perovskite solar cells (PSCs) [2,3].Currently,based on triphenylamine HTMs,the highest power conversion efficiency (PCE) of PSCs is up to 22.1％ [4].Nowadays,spiroOMeTAD is the most frequently used HTM for PSCs (Figure 1).However,the large steric hindrance of spirofluorene reduced the conjugation in molecules and impact the molecular packing,giving rise to small hole mobility.As a result,the fabrication of a smooth and thin film by a delicate process is necessary to achieve high solar cells efficiency.On the other hand,the synthesis of spiro-OMeTAD is complicated and costly.