Open Access Nano Express

Improving scattering layer through mixture of nanoporous spheres and nanoparticles in ZnO-based dye-sensitized solar cells

Chohui Kim1, Hongsik Choi1, Jae Ik Kim1, Sangheon Lee1, Jinhyun Kim1, Woojin Lee1, Taehyun Hwang1, Suji Kang1, Taeho Moon2* and Byungwoo Park1*

Author Affiliations

1 WCU Hybrid Materials Program, Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, South Korea

2 Department of Materials Science and Engineering, Dankook University, Chungnam, Cheonan 330-714, South Korea

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Nanoscale Research Letters 2014, 9:295  doi:10.1186/1556-276X-9-295

Published: 11 June 2014

Abstract

A scattering layer is utilized by mixing nanoporous spheres and nanoparticles in ZnO-based dye-sensitized solar cells. Hundred-nanometer-sized ZnO spheres consisting of approximately 35-nm-sized nanoparticles provide not only effective light scattering but also a large surface area. Furthermore, ZnO nanoparticles are added to the scattering layer to facilitate charge transport and increase the surface area as filling up large voids. The mixed scattering layer of nanoparticles and nanoporous spheres on top of the nanoparticle-based electrode (bilayer geometry) improves solar cell efficiency by enhancing both the short-circuit current (Jsc) and fill factor (FF), compared to the layer consisting of only nanoparticles or nanoporous spheres.

Keywords:
Dye-sensitized solar cell; ZnO photoelectrode; Light trapping; Nanoparticle; Nanoporous sphere