Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Solid-state dye-sensitized solar cells (SDSCs) with inorganic p-type semiconductors as hole transfer materials (HTMs) have been actively researched for practical usage. We have previously developed SDSCs with p-type CuI as an HTM, because CuI has various advantageous characteristics such as higher stability and higher conductivity than organic HTMs and hence gives high efficient photovoltaics, and eventually achieved a conversion efficiency (x) of 6% using D149 red dye [1]. For further higher x, we have developed a novel donor-accepter type double porphyrin to widen the sensitivity range and enhance the short-circuit current density (Jsc) in the present study. In addition, we have improved the open-circuit voltage (Voc) by a post treatment using inorganic iodide after the dye adsorption. We have designed a novel molecular structure and synthesized the dye composed of donor-accepter type double porphyrin (DIPDAB2), which has higher absorption coefficient than conventional double porphyrins (DTBC) [2] in the long wavelength range from 700 nm to 800 nm. The incident photon-to-current conversion efficiency (IPCE) of the SDSC using DIPDAB2 was higher than that of DTBC. To achieve further higher Jsc by filling the dip between the Soret band and Q band in the absorption spectrum of DIPDAB2, we have combined DIPDAB2 with other organic dyes: indoline-type D131 and D358. The IPCE spectrum covered a notably wider wavelength range than that for the D149 DSC. As a result, Jsc was improved dramatically. On another front, we have found that Voc of the SDSCs with CuI was improved by dipping the porous TiO2 electrodes into inorganic iodide solutions such as LiI, CaI2, and KI after the dye adsorption. In addition, Voc of the fabricated cells increased during light soaking for 10 to 30 min. By these treatments, x of the SDSCs with CuI using the multi-dyes consisting of the novel porphyrin (DIPDAB2) and organic dyes (D131 and D358) reached 10%, substantially exceeded the highest value of 7.4% for the conventional SDSCs with CuI using N3 dye [3].
[1] S. Moribe, et al., Appl. Phys. Express 5, 112302 (2012). [2] Y. Liu et al., Chem. Commun. 47, 4010 (2011). [3] H. Sakamoto, et al., Organic Electronics, 13, 514 (2012).
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