Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/ijms232415529
Keywords
Sb2Se3; thin-film solar cells; Cu doping; pulsed electron deposition
Funding
- 'Departments of Excellence' program of the Italian Ministry for Education, University and Research (MIUR, 2018-2022)
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Copper-doped antimony selenide thin films were deposited using low-temperature pulsed electron deposition technique, resulting in improved open circuit voltage and carrier density in photovoltaic solar cells.
Copper-doped antimony selenide (Cu-doped Sb2Se3) thin films were deposited as absorber layers in photovoltaic solar cells using the low-temperature pulsed electron deposition (LT-PED) technique, starting from Sb2Se3 targets where part of the Sb was replaced with Cu. From a crystalline point of view, the best results were achieved for thin films with about Sb1.75Cu0.25Se3 composition. In order to compare the results with those previously obtained on undoped thin films, Cu-doped Sb2Se3 films were deposited both on Mo- and Fluorine-doped Tin Oxide (FTO) substrates, which have different influences on the film crystallization and grain orientation. From the current-voltage analysis it was determined that the introduction of Cu in the Sb2Se3 absorber enhanced the open circuit voltage (V-OC) up to remarkable values higher than 500 mV, while the free carrier density became two orders of magnitude higher than in pure Sb2Se3-based solar cells.
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