Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 25, Pages 12665-12671Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp201853c
Keywords
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Funding
- National Basic Research Program of China [2011CB933302]
- National Natural Science Foundation of China [20971025, 90922004, 50903020]
- Shanghai Pujiang Project [09PJ1401300]
- Shanghai nongovernmental international cooperation program [10530705300]
- Jiangsu Major Program [BY2010147]
- Shanghai Leading Academic Discipline Project [B108]
- SRF for ROCS, SEM
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W(VI) is doped into TiO2 via a sol-gel method, and the crystalline anatase structure is well preserved with the W content ranging from 0.1% to 5%. The conduction band (CB) of TiO2 moves downward (i.e., positive shift) gradually with increasing the W content from 0.1% to 2% and then stays almost unchanged with increasing the W content from 2% to 5%. Dye-sensitized solar cells (DSSCs) based on the W-doped anatase TiO2 show an advantage in repressing the charge recombination. The electron lifetime in the DSSC is significantly improved by the W-doping. As a result of the positive shift of the CB and repressed charge recombination, the short-circuit photocurrent (J(sc)) of the DSSC is improved remarkably. The collective effect of the positive shift of the CB and the enhanced electron lifetime caused by the W-doping makes the open-circuit photovoltage (V-oc) remain almost unchanged below 0.5% W-doping and decrease above 0.5% W-doping. The highest power conversion efficiency (eta = 9.1%) is obtained at 0.2% W-doping, which shows increases by 17% in J(sc) and by 20% in eta, as compared with the undoped DSSC.
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