Titanium dioxide quantum dots: Magic materials for high performance underlayers inserted into dye-sensitized solar cells

Well crystalline TiO2 quantum dots with size about 3.6 nm are synthesized and used to fabricate high performance underlayers in dye-sensitized solar cells (DSCs). The TiO2 quantum dots underlayer (TiO2-QD-UL) covered FTO glasses show excellent transmittance as that of the non-covered one. The TiO2-Q...

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Veröffentlicht in:Journal of power sources 2014-12, Vol.268, p.670-676
Hauptverfasser: Que, Lanfang, Lan, Zhang, Wu, Wanxia, Wu, Jihuai, Lin, Jianming, Huang, Miaoliang
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Sprache:eng
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Zusammenfassung:Well crystalline TiO2 quantum dots with size about 3.6 nm are synthesized and used to fabricate high performance underlayers in dye-sensitized solar cells (DSCs). The TiO2 quantum dots underlayer (TiO2-QD-UL) covered FTO glasses show excellent transmittance as that of the non-covered one. The TiO2-QD-UL can efficiently suppress dark reaction in the cell by increasing the onset bias voltage for generating dark current to a higher value and shifting flat-band potential of the photoanodes to a more negative position. Moreover, the shorten electron transport time, lengthen electron life time, enhanced charge collection efficiency, and the decreased electron transport resistance between TiO2/FTO glass are obtained with TiO2-QD-UL in the cell. Power conversion efficiency of the DSC with TiO2-QD-UL in the photoanode is enhanced from 7.10% to 9.43%, corresponding to 32.82% increment. •Well crystalline 3.6 nm TiO2 quantum dots (QDs) were synthesized.•TiO2 QDs were used to fabricate blocking layers in dye-sensitized solar cells.•Power conversion efficiency was enhanced from 7.10% to 9.43%.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2014.06.104