Search

Abstract: The synthesis and characterization of two related families of star‐shaped thiophene‐containing hole‐transporting materials (HTMs) based on fused tetrathienoanthracene and nonfused tetrathienylbenzene cores are reported. All of them are endowed with four terminal (4,4′‐dimethoxy)diphenylamino groups that are either linked directly to the core or showed a different type of bridges (i.e., thiophene‐phenyl or phenyl rings). The novel HTMs are tested in mixed‐ion perovskite (Cs0.1FA0.74MA0.13PbI2.48Br0.39) solar cells, and power conversion efficiencies of up to 18.8% are measured under 1 sun irradiation, comparable with the efficiency obtained for the reference cell using 2,2′,7,7′‐tetrakis(N,N′‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene as an HTM. [ABSTRACT FROM AUTHOR]

Amino donor groups-substituted zinc(II) phthalocyanines (ZnPcs) BI25 , BL07 and BL08 were obtained via cyclotetramerization of suitable phthalonitriles that were synthesized by Pd catalyzed amination reaction between 4-iodophthalonitrile and a selected secondary amine. The BI25 , BL07 and BL08 ZnPcs were characterized using spectroscopic and electrochemical methods, and used as hole transporting layer in perovskite solar cells. The open circuit voltage (V OC ) of perovskite solar cell devices reached close to 1 V, and the short-circuit current density (J SC ) values evaluated from J-V curves were 16.2, 8.42, and 16.9 mA/cm 2 , respectively, demonstrating influence of the HOMO levels of ZnPcs. A power conversion efficiency of 11.75% was obtained in the case of BI25 , which is the highest value ever reported using ZnPcs as HTMs in perovskite solar cells with traditional device geometry. [ABSTRACT FROM AUTHOR]