Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
To obtain the high efficiency of D-π-A sensitizer-ased dye sensitized solar cells (DSSCs), the structural modifications of a π-bridge, including tuning the energy levels and the improvement of intramolecular charge transfer (ICT) from D to A of the sensitizer, are particularly essential. On the basis of this concept, we have already reported SGT-137 of using 4-hexyl-4H-thieno[3,2-b]indole (Hexyl-TI) moiety as the π-bridge unit to enhance the π-bridge capability of SGT organic sensitizers [1], but their energy level are much lower than those of electrolytes (Co(bpy)32+/3+ and I−/I3−). Therefore, to further improve the donating ability of SGT-137, we have designed and synthesized a new series of Hexyl-TI based organic sensitizers with fluorene electron donor groups that are attached with alkoxy (SGT-147, SGT-148) and alkoxy phenyl substituents SGT-149), with reference dye (SGT-146). By systematically exploring the effects of the alkoxy and alkoxy phenyl substituents, a significant influence of the dyes in light absorption is observed, which is showed up-shift of the HOMO energy level of dyes compared with SGT-137. The SGT-149 based DSSCs exhibits higher short-circuit current densities and achieved a high power conversion efficiency (PCE) of 11.9%. Notably, by utilizing co-sensitization with SGT-149 and SGT-021 [2], the PCEs for co-sensitization cells are reached >14.1% in conjunction of Co(bpy)32+/3+ redox electrolyte and >11.5 % in conjunction of I−/I3− redox electrolyte.
This work was supported by the Korean government (Ministry of Science, ICT and Future Planning) through the Mid‐career Researcher Program (NRF 2017R1A2A1A17069374), the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF‐2016M1A2A2940912) and “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (KETEP‐20184030201910).
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