Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 7, Issue 5, Pages 982-991Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201100967
Keywords
dyes; pigments; electrochemistry; electron transfer; heterocycles; solar cells
Categories
Funding
- NSFC/China [2116110444, 21172073, 61006048]
- National Basic Research 973 Program [2011CB808400]
- Fundamental Research Funds for the Central Universities [WJ0913001, WJ1014025]
- Ph.D. Programs Foundation of the Ministry of Education of China [20090074110004]
- Scientific Committee of Shanghai [10520709700]
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Two new benzotriazole-bridged sensitizers are designed and synthesized (BTA-I and BTA-II) containing a furan moiety for dye-sensitized solar cells (DSSCs). Two corresponding dyes (BTA-III and BTA-IV) with a thiophene spacer were also synthesized for comparison. All of these dyes performed as sensitizers for DSSCs, and the photovoltaic performance data of these benzotriazole-bridged dyes showed a high open-circuit voltage (Voc: 804834 mV). Among the four dyes, DSSCs based on BTA-II, with a furan moiety and branched alkyl chain, showed the highest Voc (834 mV), a photocurrent density (Jsc) of 12.64 mA?cm-2, and a fill factor (FF) of 0.64, corresponding to an overall conversion efficiency (?) of 6.72?%. Most importantly, long-term stability of the BTA-IIV-based DSSCs with ionic-liquid electrolytes under 1000 h light-soaking was demonstrated, and BTA-II exhibited better photovoltaic performance of up to 5.06?% power conversion efficiency.
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