Optimization of the properties of the molybdenum back contact deposited by radiofrequency sputtering for Cu(In1−xGax)Se2solar cells
| Autor: | Hervé Peyre, Antoine Tiberj, A. Sagna, Sylvie Contreras, Camille Barbier, Matthieu Moret, Olivier Briot |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Renewable Energy Sustainability and the Environment business.industry Doping chemistry.chemical_element Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Copper indium gallium selenide solar cells Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Aluminium Sputtering Molybdenum Electrical resistivity and conductivity 0103 physical sciences Optoelectronics Electrical measurements 0210 nano-technology business Non-radiative recombination |
| Zdroj: | Solar Energy Materials and Solar Cells. 174:418-422 |
| ISSN: | 0927-0248 |
| Popis: | In this work, we report on using RF sputtering technique for the deposition of the molybdenum back contact for CIGS solar cells. This allows to realize the back and front contact (Aluminum doped ZnO is used for the front contact) with the same deposition system. We demonstrate that deposition pressure controls the morphology and resistivity of the Mo back contact. This latter point has been the subject of apparently contradicting reports in the literature, but an analysis of the deposition parameters versus sputtering mechanisms allow to understand this spread of results. Full cells have been grown onto the various sets of Mo films, and their electrical properties (efficiencies, Voc, Jcc and fill factors) are analyzed and modeled. From this, we obtain the ideality factors (reflecting the amount of carrier recombination) and with the shunt resistances we find these to be the main parameters which explains the different cells performances versus Mo back contact growth conditions. Low temperature photoluminescence is used as a tool to get a deeper insight on the recombination paths in the samples and support the conclusions drawn from electrical measurements: the molybdenum films grown at 1 Pa yields the best cells results, owing to minimized non radiative recombination. Finally, using the optimum Mo films and improving the quality of the top contact allow us to obtain CIGS solar cells with efficiencies of 17%, although the CIGS, CdS and ZnO layers are not still fully optimized. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect