Higher open-circuit voltage set by cobalt redox shuttle in SnO2 nanofibers-sensitized CdTe quantum dot solar cells
| Autor: | Soorya Sasi, A. Sreekumaran Nair, Gautam E. Unni |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Photocurrent
Auxiliary electrode Photoluminescence Materials science Open-circuit voltage Energy Engineering and Power Technology Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cadmium telluride photovoltaics 0104 chemical sciences law.invention Fuel Technology Chemical engineering Quantum dot law Nanofiber Solar cell Electrochemistry 0210 nano-technology Energy (miscellaneous) |
| Zdroj: | Journal of Energy Chemistry. 25:481-488 |
| ISSN: | 2095-4956 |
| DOI: | 10.1016/j.jechem.2016.02.008 |
| Popis: | In this study, we report an efficient CdTe-SnO 2 quantum dot (QD) solar cell fabricated by heat-assisted drop-casting of hydrothermally synthesized CdTe QDs on electrospun SnO 2 nanofibers. The as-prepared QDs and SnO 2 nanofibers were characterized by dynamic light scattering (DLS), UV–Vis spectroscopy, photoluminescence (PL) spectra, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The SnO 2 nanofibers deposited on fluorine-doped tin oxide (SnO 2 ) and sensitized with the CdTe QDs were assembled into a solar cell by sandwiching against a platinum (Pt) counter electrode in presence of cobalt electrolyte. The efficiency of cells was investigated by anchoring QDs of varying sizes on SnO 2 . The best photovoltaic performance of an overall power conversion efficiency of 1.10%, an open-circuit voltage ( V oc ) of 0.80 V, and a photocurrent density ( J SC ) of 3.70 mA/cm 2 were obtained for cells with SnO 2 thickness of 5–6 µm and cell area of 0.25 cm 2 under standard 1 Sun illumination (100 mW/cm 2 ). The efficiency was investigated for the same systems under polysulfide electrolyte as well for a comparison. |
| Databáze: | OpenAIRE |
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