Sulfonyldibenzene-based hole-transporting materials for efficient n-i-p perovskite solar cells

• Published in: Science China. Chemistry 2021, Vol.64 (1), p.127-133
• Main Authors: Qin, Tian, Wu, Fei, Mu, Yingxiao, Long, Yubo, Zhu, Linna, Zhao, Juan, Chi, Zhenguo
• Format: Article
• Language: English
• Subjects: Carbazoles; Chemical synthesis; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Control equipment; Efficiency; Electrodes; Energy conversion efficiency; Hole mobility; Perovskites; Photovoltaic cells; Solar cells
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-020-9899-x

Organic hole-transporting materials (HTMs) are an essential component in conventional perovskite solar cells (PSCs). In this work, two sulfonyldibenzene-based molecules, named CS-04 and CS-05 , are synthesized and employed as HTMs in n-i-p PSCs. In comparison with CS-04 , the carbazole-substituted methoxytriphenylamine (CzMOTPA) group in CS-05 exhibits an increased degree of molecular distortion, thus endowing CS-05 with excellent solvent solubility and film-formation ability. Moreover, CS-05 shows a high hole mobility, superior hole extraction and hole transporting properties. As a result, CS-05 yields impressive device performances with a high power conversion efficiency (PCE) of 20.15%, while that of CS-04 based device is 19.50%, which is comparable to that of the Spiro-OMeTAD based control device (19.59%). This finding illustrates the potential of sulfonyldibenzene-based molecules for the applications in PSCs, and also provides a novel avenue to improve the performances and stability of PSCs by tailoring the sulfonyldibenzene-based molecules.