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Highly fluorescent anthracene derivative as a non-fullerene acceptor in OSCs with small non-radiative energy loss of 0.22 eV and high PCEs of over 13%
- Yao, Chao, Liu, Bin, Zhu, Yanan, Hong, Ling, Miao, Jingsheng, Hou, Jianhui, He, Feng, Meng, Hong
- Journal of materials chemistry A 2019 v.7 no.17 pp. 10212-10216
- anthracenes, chemistry, energy, fluorescence
- Herein, we designed and synthesized a highly fluorescent non-fullerene acceptor (ANT-4F) based on an anthracene (ANT) core. OSCs based on ANT-4F/PBDB-TF exhibited a significantly decreased Vₗₒₛₛ,ₙₒₙ₋ᵣₐd of 0.22 V (calculated from high EQEEL = 1.7 × 10⁻⁴). Simultaneously, high charge-transfer state energy (ECT = 1.54 eV) was obtained. Compared with OSCs based on IT-4F/PBDB-TF, a reduced Vₗₒₛₛ,ₙₒₙ₋ᵣₐd and higher ECT concurrently contributed to an increased Vₒc of 0.93 V. Consequently, despite the lower Jₛc of 19.0 mA cm⁻², an overall high PCE of 13.1% can be obtained. This work exemplified the great potential for highly fluorescent NFSAs in decreasing Vₗₒₛₛ,ₙₒₙ₋ᵣₐd and improving PCEs.