Herman Lia Agustine, Yip Chan Hoe, Wong Chee Cheong
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798.
J Nanosci Nanotechnol. 2010 Jul;10(7):4657-62. doi: 10.1166/jnn.2010.1683.
Photonic crystals are ordered nanostructures that are designed to manipulate the propagation of light. The periodicity of a photonic crystal can be engineered to be highly reflective at selected wavelengths. In this work, a mono-layer and double-layer colloidal photonic crystal film were self-assembled on a glass substrate to be used as backreflectors in a dye-sensitized solar cell (DSSC). The colloidal photonic crystal film consists of different polystyrene monodispersed particles with sizes between 200 nm and 290 nm. Making use of flow controlled vertical deposition (FCVD) method, opaline films of Bragg's reflection wavelength between 450 nm to 750 nm were achieved. These wavelengths were designed to match the absorption spectrum of the Ruthenium-complex dye used in DSSC. An enhancement in incident photon-to-current conversion efficiency (IPCE) of the opaline backreflector DSSC of about 30% at Bragg's peak wavelength has been achieved.
光子晶体是一种有序的纳米结构，旨在控制光的传播。光子晶体的周期性可以设计成在选定波长下具有高反射率。在这项工作中，单层和双层胶体光子晶体薄膜在玻璃基板上自组装，用作染料敏化太阳能电池（DSSC）的背反射器。胶体光子晶体薄膜由尺寸在200纳米至290纳米之间的不同聚苯乙烯单分散颗粒组成。利用流动控制垂直沉积（FCVD）方法，获得了布拉格反射波长在450纳米至750纳米之间的蛋白石薄膜。这些波长的设计与DSSC中使用的钌配合物染料的吸收光谱相匹配。在布拉格峰值波长处，蛋白石背反射器DSSC的入射光子到电流转换效率（IPCE）提高了约30%。
