Technical development in dye-sensitized solar cells with product costs of 50 Yen/W

为了降低染料敏化太阳能电池（DSSCs）的生产成本，提高光电转换效率和使用廉价的电池部件是必要的。为了解决这些问题，我们进行了以下研究：(1)双层工作电极的技术开发，在纳米多孔二氧化钛衬底上以空隙作为离子路径构建多孔二氧化钛衬底。(2)串联型DSSCs的技术发展，该串联型DSSCs的顶层由三联吡啶络合染料（黑色染料）吸附，底层由联吡啶络合染料（N719）吸附。(3)由铂替代碳层构成的对电极技术发展。通过第一次和第二次技术开发，制造出了效率为9%、孔径面积为50平方毫米的DSSC。

The improvement of the efficiency in converting the sunlight into electricity and the use of inexpensive cell parts are necessary to reduce product costs of dye-sensitized solar cells (DSSCs). For resolving these issues, we carried out studies as follows: (1) Technical development of bilayer working electrodes, which constructed porous titanium dioxide overlayers with voids as ion path on nanoporous titanium dioxide underlayers. (2) Technical development of tandem type DSSCs, which consist of the top layer adsorbed by terpyridine complex dye (black dye) and the bottom layer adsorbed by bipyridine complex dye (N719). (3) Technical development of counter electrodes, which consist of platinum-substitute carbon layer. A 9% efficient DSSC with an aperture area of 50 mm square was fabricated from the first and second techical developments.