Journal
RSC ADVANCES
Volume 5, Issue 39, Pages 30617-30623Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra02091c
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Funding
- Hundred Talents Program of Chinese Academy of Sciences [Y20245YBR1]
- National Natural Science Foundation of China [21402215, 61474124]
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At present, the performance of quantum dot-sensitized solar cells (QDSCs) is still much lower than that of conventional dye-sensitized solar cells. Besides efforts on the development of photoanodes, a new generation of materials for counter electrodes is also urgently needed to optimize the structure of QDSCs and improve their power conversion efficiency (PCE). Here, fullerene (C-60) films on transparent conductive substrates have been prepared through a cost-effective doctor blade process, which were subsequently applied as counter electrodes in QDSCs. Compared to conventional counter electrodes composed of Pt or activated carbon (AC) electrodes, the C-60-based counter electrodes exhibit better electrocatalytic activity, lower charge-transfer resistance and higher exchange current density. Based on these merits, the QDSC with C-60-based counter electrode and a polysulfide electrolyte shows an improved PCE of 4.18% under simulated 100 mW cm(-2) AM 1.5 illumination. In contrast, the PCEs of the QDSC using Pt or activated carbon as counter electrode under the same conditions are only 1.17% and 3.48%, respectively. Stability test reveals that the C-60-based counter electrode has good stability at room temperature.
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