Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (6): 627-633.DOI: 10.15541/jim20150518

• Orginal Article • Previous Articles     Next Articles

Boron and Sulfur Co-doped TiO2 Nanofilm as High Efficiency CdS Quantum-dot-sensitized Solar Cells

LI Ling1, XIAO Jun-Ying1, CUI Mi-Dou1, TAI You-Yi2, PANG Yong-Wen1, HAN Song1, LI Xiao-Wei1   

  1. (1. Hebei Key Lab of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China; College of Materials and Engineering, Sichuan University, Chengdu 610064, China)
  • Received:2015-10-23 Revised:2015-12-01 Online:2016-06-20 Published:2016-05-19
  • About author:LI Ling. E-mail: lilinghbu@163.com
  • Supported by:
    National Natural Science Foundation of China (21201053);Specialized Research Fund for the Doctoral Program of Higher Education (20121301120005);Fund in Hebei Province Natural Science (F2014201078, 2015201050);Applied Basic Research Plan Key Basic Research Project in Hebei Province(14964306D);Youth Fund in Hebei Province Department of Education China (ZD2016055, QN2014057);College Students' Innovative Entrepreneurial Training Program in Hebei Province(2015066;2015161;201510075047, 026);Students' Comprehensive Quality Training Program in Hebei University (2015zh0442;2015zh0443);Outstanding Youth Fund of Hebei University(2015JQ02)

Abstract:

B and S co-doped TiO2 was prepared by a typical hydrothermal synthesis. Then the obtained B-S-TiO2 was dissolved in organic solvent to form paste and then coated on FTO conducting glass by screen printing to prepare nanofilm. The CdS/B-S-TiO2 composite electrodes was obtained by chemical bath deposition (CBD) using B-S-TiO2 nanofilm and CdS quantum dots (QDs). The obtained samples were characterized by EDS, XRD, TEM and UV-Vis. The results show that B and S do not change the structure of anatase TiO2. Noticeable shifts of absorbance edge towards longer wavelength were observed and the absorbance intensity of the B-S-TiO2 nanofilm increases significantly. Furthermore, NiS was prepared as counter electrode by CBD and a modified polysulfide redox couple, ((CH3)4N)2S/((CH3)4N)2Sn, was employed as electrolyte to assemble CdS quantum-dots (QDs)-sensitized solar cells. The measurements show that the cells have an enhanced energy conversion efficiency under AM 1.5 G illuminations which increased from 3.21% to 3.69%, about 14.9% increment, with a significantly high open voltage (Voc) of 1.218 V, a high filled factor (ff) of 88.7%, and a short-circuit photocurrent (Jsc) of 3.42 mA/cm2.

Key words: CdS quantum dots sensitized solar cells, B/S co-doped TiO2, chemical bath deposition (CBD), NiS counter electrode, ((CH3)4N)2S/((CH3)4N)2Sn electrolyte

CLC Number: