Two facile thiophene–arylamine hole‐transporting materials, obtained by varying the substitution position of arylamine moieties on the thiophene π linker, are reported. The substitution position effect of two hole‐transporting materials on the performance of perovskite solar cells is further investigated theoretically and experimentally. The compound in which arylamine moieties are located on the 2,5‐substitution position of thiophene shows better conjunction than that with the 3,4‐substituent. When used as hole‐transporting materials in CH3NH3PbI3‐based solar cells, the 2,5‐substituent exhibits a power conversion efficiency (PCE) of 15.13 %, which is over 40 % higher than that of the 3,4‐substituent. Moreover, the PCE of 2,5‐substituent based device is comparable with that of 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD).
A novel and efficient method has been developed for the synthesis of highly functionalized benzo[g]- and dihydropyrano[2,3-g]chromene derivatives via addition and subsequently cyclization of 2-hydroxynaphthalene-1,4-dione or 2,5-dihydroxycyclohexa-2,5-diene-1,4-dione to the condensation product of an aldehyde with malononitrile in the presence of a catalytic amount of Et(3)N in CH(3)CN at ambient temperature. The procedures are very facile. The products can be obtained with simple filtration in high yields, and no more purification is needed. These compounds are closely related to ring systems such as beta-lapachone, alpha-xiloidone, lambertellin, pyranokunthone B, and WS-5995A, which have a broad spectrum of biological activities.
A new facile fused tetraphenylethylene–triphenylamine hole transporting material has been developed, which shows obviously higher performance than the non-fused counterpart in perovskite solar cells.
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