文献类型：期刊文献

英文题名：Low cost and stable quinoxaline-based hole-transporting materials with a D-A-D molecular configuration for efficient perovskite solar cells

作者：Zhang, Hao[1];Wu, Yongzhen[1];Zhang, Weiwei[1];Li, Erpeng[1];Shen, Chao[1];Jiang, Huiyun[1];Tian, He[1];Zhu, Wei-Hong[1]

机构：[1]East China Univ Sci Technol, Joint Int Res Lab Precis Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem,Feringa Nobel Pri, Key Lab Adv Mat & Inst Fine Chem,Sch Chem & Mol E, Shanghai 200237, Peoples R China

年份：2018

卷号：9

期号：27

起止页码：5919

外文期刊名：CHEMICAL SCIENCE

收录：;EI(收录号：20182905560907);WOS:【SCI-EXPANDED(收录号:WOS:000438391900007)】；

基金：This work was supported by the NSFC for Creative Research Groups (21421004), Key Project (21636002), NSFC/China, the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Science and Technology Commission of Shanghai Municipality (15XD1501400, 17ZR1407400), and the Fundamental Research Funds for the Central Universities (WJ1416005, WJ1714007). The authors thank Prof. Z. Ning and T. Zhang of ShanghaiTech University for their useful discussions and technical support for device optimization.

语种：英文

外文关键词：Hole mobility - Single crystals - Costs - Perovskite

摘要：The use of expensive hole transporting materials (HTMs), such as spiro-OMeTAD, in perovskite solar cells (PSCs) is one of the critical bottlenecks to hinder their large-scale applications. Some low-cost alternatives have been developed by combining conjugated electron-rich cores with arylamine end-caps, usually in a donor- spacer-donor (D--D) molecular configuration. However, incorporation of electron-rich cores can lead to undesirable up-shift in the HOMO energy level and low stability, and few of these new HTMs can outperform spiro-OMeTAD in terms of device efficiency. Given that electron-deficient units have shown many advantages in developing efficient and stable photovoltaic dyes and polymers, we herein present a couple of novel molecular quinoxaline-based HTMs (TQ1 and TQ2) with a donor-acceptor-donor (D-A-D) configuration, especially for rationally modulating the HOMO level, improving the stability and decreasing the cost. The TQ2-based PSCs exhibit a maximum efficiency of 19.62% (working area of 0.09 cm(2)), unprecedentedly outperforming that of spiro-OMeTAD (18.54%) under the same conditions. In comparison, TQ1 based devices only showed moderate efficiencies (14.27%). The differences in hole extraction and transportation between TQ1 and TQ2 are explored by photoluminescence quenching, mobility and conductivity tests, and single crystal analysis. The scaling-up of the TQ2 based device to 1.02 cm(2) achieves a promising efficiency of 18.50%, indicative of high film uniformity and processing scalability. The significant cost advantage and excellent photovoltaic performance strongly indicate that the D-A-D featured TQ2 has great potential for future practical applications.