Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Four 2D-π-A dyes (OMS4-7), comprising various diarylamine groups as donor units, dibenzofulvene-thiophene or dibenzofulvene-furan as the π-conjugation segment, and a cyanoacrylic acid as anchor, have been synthesized. The dyes displayed board UV-vis absorption ranging from 300-500 nm. Rather red-shifted as dibenzofulvene-thiophene bridge replaced to dibenzofulvene-furan one. In addition, the OMS5 and OMS7 containing 1-naphthylphenylamine donor exhibited higher molar excitation coefficient than the corresponding OMS4 and OMS6. The cell performance based on those dyes exhibited efficiencies ranging from 0.28-1.82%, as comparing to the standard N719-based device (PCE = 7.28%) fabricated under similar conditions. The cell of OMS5 based sensitizer exhibited the highest short current (Jsc) at 5.09 mA/cm2, the highest open-circuit (VOC) at 0.60 V, together with the best cell performance at 1.82%. These dyes were mixed with co-adsorbents (CDCA) for better cell performance. In addition, dim light condition was also be conducted for indoor applications.
Financial support from the Ministry of Science and Technology (MOST 106-2221-E-151 -046 -MY2), Taiwan ROC are gratefully acknowledged.
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