Tsai, Ming-Shan and Hsu, Ying-Chan and Lin, Jiann T. and Chen, Hung-Cheng and Hsu, Chao-Ping (2007) Organic dyes containing 1H-phenanthro[9,10-d]imidazole conjugation for solar cells. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (50). pp. 18785-18793.
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Official URL: http://pubs.acs.org/doi/abs/10.1021/jp075653h
Series of dyes based on 1H-phenanthro[9,10-d]imidazole chromophores were developed and characterized. Dye-sensitized solar cells (DSSCs) using the dyes as the sensitizers exhibited good efficiencies, ranging from 2.95 to 4.68%, which reached 45-70% with respect to that of an N719-based device fabricated under similar conditions. Incorporation of arylamine moieties at 1H-phenanthro[9,10-d]imidazole was found to retard charge recombination of the electrons in the conduction band of TiO2 with the oxidized dyes. In contrast, incorporation of hydrophobic dodecanyl chains at 1H-phenanthro[9,10-d]imidazole reduced the dark current and improved the device efficiency. Results of TDDFT computation on the compounds are in support of the charge-transfer character of the compounds and consistent with the device performance. A cascade of charge separation is possible for compounds with arylamine moieties via an internal conversion from a bright higher excited state to a long-range charge separated state. Our results indicate that the extent of charge separation in the excited state is an important factor for DSSC efficiency.
|Uncontrolled Keywords:||organic dyes - Dye-sensitized solar cells - TiO2|
|Subjects:||Technology > Nanotechnology and energy applications|
Material Science > Nanochemistry
|Deposited On:||01 Sep 2009 12:22|
|Last Modified:||01 Sep 2009 12:22|
Repository Staff Only: item control page