Robust surface passivation of trap sites in PbS q-dots by controlling the thickness of CdS layers in PbS/CdS quantum dot solar cells
| Autor: | Jayasundera Bandara, Arumukham Manjceevan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Passivation Renewable Energy Sustainability and the Environment Open-circuit voltage Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cadmium sulfide 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound Adsorption chemistry Chemical engineering Quantum dot law Solar cell Lead sulfide 0210 nano-technology Deposition (law) |
| Zdroj: | Solar Energy Materials and Solar Cells. 147:157-163 |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/j.solmat.2015.12.014 |
| Popis: | The PbS quantum dot sensitized solar cells were prepared on 3-mercaptoproponic acid (MPA) anchored mesoporous TiO2 films by a successive ionic layer adsorption and reaction (SILAR) process and the fabricated PbS q-dots were passivated by deposition of a CdS layer. In SILAR process, MPA solution was mixed with sulfide precursor solution and used it in every SILAR cycle for rapid conversion of Pb and Cd into their respective sulfides form. Performances of surface passivated and non-passivated PbS q-dot solar cells were compared where solar cells fabricated with q-dots of PbS, PbS/CdS, CdS showed best efficiencies (η) of 1.0, 5.7, 0.9% with current densities (Jsc) of 10.1, 22.8, 2.7 mA cm−2 and open circuit voltages (Voc) of 280, 501, 498 mV respectively. The enhanced efficiency of PbS/CdS q-dot solar cell was mainly due to increase in Jsc and Voc compared to PbS q-dot solar cells. The outstanding performance of PbS/CdS sensitized solar cell was found to be due to reduction of trap states in PbS particle by the surface passivation effect of CdS q-dots and the surface passivation effect of CdS in PbS/CdS sensitized solar cell is reported by EIS and voltage decay investigations. |
| Databáze: | OpenAIRE |
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