Photovoltaic properties of LixCo3-xO4/TiO2 heterojunction solar cells with high open-circuit voltage
2016 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 157, 126-133 p.Article in journal (Refereed) Published
All-oxide solar cells are presently attracting extensive research interest due to their excellent stability, low-cost and non-toxicity. However, the band gap of metal oxides is lack of effective optimization and results in poor photovoltaic performance, thus hindering their practical applications. In this work, Co3O4 was investigated for application as a photo-absorber in all-oxide solar cells, and its band gap was optimized by introducing Li dopant into the spinel structure. LixCo3-xO4 nanoparticles, prepared via the hydrothermal method, were homogenously coated onto TiO2 mesoporous films, which were then used to fabricate planar heterojunction TiO2/LixCo3-xO4 solar cells (SCs). The effects of Li-doping on the heterojunction solar cell performance were further investigated. The findings revealed that the incorporation of Li ions into Co3O4 led to a significant enhancement in short-circuit current density (J(sc)). Remarkably, a high open-circuit voltage (V-oc) of 0.70 V was also achieved. Besides, reasons for the enhanced cell performance are the narrower band gap, reduced photogenerated carrier recombination and the more favorable energy band structure as compared with SCs assembled from pure Co3O4.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 157, 126-133 p.
Planar heterojunction solar cells, Li-doped Co3O4, Open-circuit voltages, Carrier recombination, Energy band structure
IdentifiersURN: urn:nbn:se:kth:diva-194252DOI: 10.1016/j.solmat.2016.05.036ISI: 000384391700017ScopusID: 2-s2.0-84971350792OAI: oai:DiVA.org:kth-194252DiVA: diva2:1040760
QC 201610282016-10-282016-10-212016-11-03Bibliographically approved