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《Progress in Natural Science:Materials International》 2018年05期
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Blue TiO_2 polymorph: An efficient material for dye-sensitized solar cells fabricated using a low-temperature sintering process

Huy Hao Nguyen  Gobinda Gyawali  Tae Ho Kim  Sami Bin Humam  Soo Wohn Lee  
【摘要】:Recently,surface-disordered or non-stoichiometric TiO_2,such as blue TiO_2(B-TiO_2),has received much attention owing to its unique properties,such as structural disorder near the surface and the existence of Ti~(3+)ions and oxygen vacancies.Therefore,surface-disordered TiO_2has been applied for microwave absorption,photocatalysis,in photoelectrochemical sensors and rechargeable lithium-ion batteries.In this work B-TiO_2,a polymorph consisting of nanoparticles,nanotubes and nanosheets,was successfully synthesized and employed as a semiconductor layer in dye-sensitized solar cells(DSSCs)fabricated using a low-temperature heat treatment process(120°C).Based on the analyses of the experimental results regarding the structure and those from the characterization of B-TiO_2,and its application to DSSCs,it has been found that the B-TiO_2 material has an effect on electron-hole pair separation.The conversion efficiency of the B-TiO_2 DSSC(BTiO_2-DSSC)was 6.18%,whereas that of the TiO_2-P25 DSSC(P25-DSSC)was 3.61%,and that of the TiO_2 polymorph DSSC(PTiO_2-DSSC)which is the precursor of B-TiO_2 was 4.51%.

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