期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 13, 页码 8598-8606出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta00315a
关键词
-
The study introduces a new low-cost hybrid methoxy-free donor and a triple pi-bridge strategy to enhance the performance of methoxy-free donor-based hole-transporting materials. The newly developed indeno[2,1-b]carbazole HTMs show significantly increased hole mobility and improved charge extraction, leading to top efficiencies for perovskite solar cells.
Methoxy-free donors are an emerging class of alternative methoxy triphenylamine materials toward stable organic hole-transporting materials (HTMs). However, low cost, stable and efficient methoxy-free donors are scarce. Moreover, the lack of a molecular design strategy limits the further development of methoxy-free donor-based HTMs. This study reports a newly developed low cost hybrid methoxy-free donor (viz., indeno[2,1-b]carbazole) as well as a triple pi-bridge strategy to enhance the performance of methoxy-free donor-based HTMs. Based on this strategy, two new indeno[2,1-b]carbazole HTMs, termed M136 and M138, were tailor-made and tested in perovskite solar cells (PSCs). Upon incorporating the triple pi-bridges (i.e. thiophene-dithieno[3,2-b:2 ',3 '-d]pyrrole-thiophene and thiophene-3,4-ethylenedioxythiophene-thiophene), the resulting indeno[2,1-b]carbazole HTMs (M136 and M138) exhibit a significantly increased hole mobility, improved charge extraction and minimized trap-assisted recombination as compared to M135 and M137 with unitary and binary bridges, respectively. Consequently, the optimized devices based on M138 achieved an efficiency of 21.37%, which is among the top efficiencies for PSCs based on methoxy-free donor HTMs. The findings demonstrate that indeno[2,1-b]carbazole is an excellent methoxy-free donor. In addition, this work underscores the effectiveness of pi-bridge engineering to improve the performance of methoxy-free donor-based HTMs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据