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Molecules 2013, 18(3), 3107-3117; doi:10.3390/molecules18033107
Article

Solution-Processed Organic Photovoltaics Based on Indoline Dye Molecules Developed in Dye-Sensitized Solar Cells

1,2, 1, 1, 1, 2 and 1,*
1 Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata University, Yonezawa, Yamagata 992-8510, Japan 2 State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
* Author to whom correspondence should be addressed.
Received: 4 January 2013 / Revised: 25 February 2013 / Accepted: 26 February 2013 / Published: 7 March 2013
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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 short-circuit 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).
Keywords: solution processed; indoline dye; organic solar cells; dye-sensitized solar cells solution processed; indoline dye; organic solar cells; dye-sensitized solar cells
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liu, Z.; Ojima, H.; Hong, Z.; Kido, J.; Tian, W.; Wang, X.-F. Solution-Processed Organic Photovoltaics Based on Indoline Dye Molecules Developed in Dye-Sensitized Solar Cells. Molecules 2013, 18, 3107-3117.

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