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E ffect of Mn 2+ d op ing on the performance of quantum dots sensitized solar cells

RENBAO WANG1,2, SHAORUI WANG1, HAIHONG NIU3, SHIDING MIAO1, LEI WAN1, JINZHANG XU1,*

Affiliation

  1. School of Electrical Engineering and Automationutomation, Hefei University of Technology, Hefei 230009, P. R. China
  2. School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan 232001, P. R. China
  3. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, P. R. China

Abstract

Mn2+ doped of CdS is employed to improv e quantum dots sensitized solar cells (QDSSCs) performance. The effects of Mn2+ doped on the performance of QDSSCs a re investigated. QDSSCs that are fabricat ed with doped CdS/CdSe deposited on meso porous TiO2-nano-SiO2 hybrid film as photoanode have higher power conversion efficiency under the illumination of one sun (AM1.5, 100mW/cm2), and exhibit higher activity especially in the short circuit current density (Jsc) as compared to the undoped QDSSCs. It is found that certain amou nt of Mn2+ doped in CdS is crucial to make photoelectrons to be trapped and protect them from charge recombination with oxidized polysulfide and/or holes. The 60mM Mn 2+ doped concentration is optimal to obtain the highest conversion efficiency (2.45%) in the experiment. The introduced Mn2+ as mid gap states give s a significant enhancement in the performance of corresponding QDSSCs in terms of photocurrent density and power conversion efficiency..

Keywords

Mn2+-doped, Quantum dots, Solar cells.

Citation

RENBAO WANG, SHAORUI WANG, HAIHONG NIU, SHIDING MIAO, LEI WAN, JINZHANG XU, E ffect of Mn 2+ d op ing on the performance of quantum dots sensitized solar cells, Optoelectronics and Advanced Materials - Rapid Communications, 8, 1-2, January-February 2014, pp.57-62 (2014).

Submitted at: March 4, 2013

Accepted at: Jan. 22, 2014