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Three small molecule organic dyes (SMODs) with bis(4‐styryl)phenyl amino (BSPA) donor FWD4∼FWD6 are synthesized easily and applied as sensitizers for dye‐sensitized solar cells (DSSCs). The dipole moments (µ) of FWD4∼FWD6 are calculated by using density functional theory (DFT) to be 7.49, 9.64, and 9.22 D, respectively. The DSSCs based on FWD4∼FWD6 exhibit high power conversion efficiencies (η) of 5.83%, 7.62%, and 7.39%, respectively. The linear regression equation η = 0.817 µ–0.370 is created with R2 = 0.999 that reveals the equation owned high accuracy. Highly reliable linear equations are also obtained under different fabrication conditions, which indicates that the power conversion efficiency tendency is influenced only by these dyes’ intrinsic property, the dipole moment. The excellent linear correlation between the dipole moment and power conversion efficiency indicates that it is very likely to predict the power conversion efficiency precisely by calculating the dipole moment, which gives a convenient way to connect the experimental results with theoretical calculations for dyes with similar molecular structures.

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In article no. http://doi.wiley.com/10.1002/solr.201900066, Aiying Pang, Guang Shao, Yingjun Zhang, Jing‐Kun Fang, and co‐workers report three small molecule organic dyes (SMODs). For these SMODs, a linear correlation between the dipole moments (μ) and power conversion efficiency (η) are observed to be η = 0.817μ − 0.370 with R2 = 0.999. This allows for a facile way to predict the power conversion efficiency of dyes with similar molecular structure.