Improved photocurrents in hybrid solar cells: suppression of recombination reaction in the presence of SWNT
W. Lee, R.S. Mane, S-K. Min, S-H. Han
Hanyang University, KR
Keywords: photovoltaics, SWNT, hybrid, recombination
Abstract:The polyacetylene photosensitizer with quaternary pyridinium salts were layered on CdS nanocrystalline film by in situ polymerization of 2-ethynylpyridine and 4-bromobutyric acid. The in situ polymerization enhances an interfacial contact between inorganic semiconductors and conjugated polymers. The hydrophilicity of polymer photosensitizers was controlled by the anion exchange to deposit good quality P3HT layers by spin coating. The hybrid cell shows a power conversion efficiency of 2.19% under air mass (AM) 1.5 condition (I = 30 mW/cm2). The presence of single-walled carbon nanotubes (SWCNTs) on indium-doped tin oxide (ITO) substrate enhanced the charge collection and reduced recombination reaction in the cell. Nanocomposite system of In2S3/In2O3/SWCNTs, which was assembled using spray coating and wet chemical processes, shows 52.9% increment of power conversion efficiency in the presence of SWNT.