Date

Place

Room H (Room Hall 1, 1F)
P2. Poster Session II
August 21, 2015 (Friday)
14:00 ~ 15:30

[P2-152]
14:00 ~ 15:30
Title:Influence of Donors Units in Organic Photosensitizers Based on Heterocyclic Derivatives for Dye-Sensitized Solar Cells
Hyo Jeong Jo, Jung Eun Nam, Dae-Hwan Kim, and Jin-Kyu Kang (DGIST, Korea)
Abstract: ?Dye-sensitized solar cells (DSSCs) based on Ru-complexes have been achieved fairly high solarenergy-to-conversion efficiencies above 11 %. However, the Ru-complexes have some problems such as manufacturing costs and environmental issues. Recently, organic dye molecules have been employed as promising alternatives to the Ru-complexes because of potential advantages (highmolar extinction coefficient, convenient, customized molecular design) for photophysical and photochemical properties, as well as low-cost production. In this paper, we synthesized organic photosensitizing dyes have a push-pull structure and are composed of a donor, conjugated bridge, and acceptor. This work reports a metal-free sensitizer using a phenothiazine unit as the donor, thiophene and 3,4-ethylenedioxythiophene unit as the ��-conjugated bridge and a cyanoacetic acid that acts as the anchoring group for attachment on themetal oxide and as the electron acceptor. Although their structures are almost identical, we found that this originates from the diverse position of the HOMO energy levels, leading to different driving forces for regeneration. Their photovoltaic properties were measured I-V curves, incident photon-to-current (IPCE) efficiencies, impedance analysis, electron lifetimes (��) by comparison with that of ruthenium dye in same manufacturing condition.
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