Solution-processed organic photovoltaics based on indoline dye molecules developed in dye-sensitized solar cells

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Abstract

A donor-acceptor (D-A) type indoline dye, D149, was used as an electron donor in solution-processed organic solar cells (OSCs). For bulk-heterojunction (BHJ) type OSCs with PC70BM as electron acceptor, the power conversion efficiency (PCE) is sensitive to the amount of D149 in the D149/PC70BM blend film. When the concentration of D149 in the blend film was as low as 5%, the highest PCE of up to 1.29%, together with a shortcircuit current density (Jsc) of 4.58 mA·cm-2, an open-circuit voltage (Voc) of 0.90 V and a fill factor (FF) of 0.31, was achieved. In order to improve the PCE of D149-based OSCs, a bilayer-heterojunction configuration with C70 as electron acceptor has been employed. By optimizing the thickness of the D149 layer and varying the electron- and hole-transport layers, a highest PCE of up to 2.28% with a Jsc of 4.38 mA·cm-2, a Voc of 0.77 V, and an FF of 0.62 was achieved under AM 1.5G solar illumination (100 mW·cm -2).

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Liu, Z., Ojima, H., Hong, Z., Kido, J., Tian, W., & Wang, X. F. (2013). Solution-processed organic photovoltaics based on indoline dye molecules developed in dye-sensitized solar cells. Molecules, 18(3), 3107–3117. https://doi.org/10.3390/molecules18033107

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