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Photovoltaic properties of LixCo3-xO4/TiO2 heterojunction solar cells with high open-circuit voltage
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Mat, Wuhan 430062, Hubei, Peoples R China.;Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden..
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Mat, Wuhan 430062, Hubei, Peoples R China..
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Mat, Wuhan 430062, Hubei, Peoples R China.;Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden..
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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
Abstract [en]

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
2016. Vol. 157, 126-133 p.
Keyword [en]
Planar heterojunction solar cells, Li-doped Co3O4, Open-circuit voltages, Carrier recombination, Energy band structure
National Category
Materials Engineering Environmental Engineering
Identifiers
URN: urn:nbn:se:uu:diva-306234DOI: 10.1016/j.solmat.2016.05.036ISI: 000384391700017OAI: oai:DiVA.org:uu-306234DiVA: diva2:1040359
Funder
Swedish Research Council, 621-2011-4983
Available from: 2016-10-27 Created: 2016-10-26 Last updated: 2016-11-02Bibliographically approved

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