화학공학소재연구정보센터
Solar Energy, Vol.146, 150-160, 2017
High-efficiency dye-sensitized solar cells fabricated using D-D-pi-A (donor-donor/pi-spacer-acceptor) architecture
Herein, we designed and synthesized two new metal-free organic dyes CCC ((E)-2-cyano-3-(6-((E)-(9-e thy1-9H-carbazol-3-ylimino)methyl)-9-hexyl-9H-carbazol-3-y1)acrylic acid) and CTC ((E)-2-cyano-3-(44(44(E)-(9-ethyl-9H-carbazol-3-ylimino)methyl) phenyl)(phenyl)amino)phenyl)acrylic acid) of D-D-pi-A (donor-donor/pi-spacer-acceptor) architecture. N-hexyl carbazole and triphenylamine were introduced as a donor as well as pi-spacer, N-ethyl carbazole as an additional donor and cyano acrylic acid as acceptor. To evaluate photovoltaic properties of dye-sensitized solar cells (DSSCs), their photophysical, electrochemical and theoretical calculations were performed. The overall conversion efficiencies of the sensitizers CCC and CTC were 3.12% and 2.63%, respectively. Upon co-sensitized with N719 dye, fabricated solar cell with CCC dye showed highest short circuit current density of 19.33 mA/cm(2), open circuit voltage of 0.745 V and fill factor of 0.473 resulting in highest power conversion efficiency (PCE) of 8.01%, which is higher than DSSCs based on individual dyes may be due to greater incident photon current conversion efficiency and broader visible light absorption. (C) 2017 Elsevier Ltd. All rights reserved.