• Title/Summary/Keyword: Mesoporous material

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Improved Photoelectric Conversion Efficiency of Perovskite Solar Cells with TiO2:TiCl4 Electron Transfer Layer (TiO2:TiCl4 전자수송층을 도입한 페로브스카이트 태양전지의 광전변환효율 향상)

  • Ahn, Joon-sub;Kang, Seung-gu;Song, Jae-gwan;Kim, Jin-bong;Han, Eun-mi
    • Journal of the Microelectronics and Packaging Society
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    • v.24 no.4
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    • pp.85-90
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    • 2017
  • The $TiCl_4$ as a blocking material is adsorbed in the mesoporous $TiO_2$ electron transfer layer(ETL) of the Perovskite solar cell to prevent the direct contact between the FTO electrode and the photoactive layer(AL), and facilitate the movement of the electrons between $TiO_2:TiCl_4$ ETL and Perovskite AL to improve the photoelectric conversion efficiency(PCE). The structure of the perovskite solar cell is FTO/$TiO_2:TiCl_4$/Perovskite($CH_3NH_3PbI_3$)/spiro-OMeTAD/Ag. It was investigated that the dipping time of the $TiO_2$ into $TiCl_4$ aqueous solution affects on the photoelectric characteristics of the device. By the dipping for 30 minutes, the PCE of the perovskite solar cell with the $TiO_2:TiCl_4$ ETL was the highest 10.46%, which is 27% higher than the cell with $TiO_2$ ETL. From SEM, EDS, and XRD characterization on the $TiO_2:TiCl_4$ ETL and the perovskite AL, it was measured that the decrease of the porosity of the $TiO_2$ layer, the detection of the Cl component by the $TiCl_4$ adsorption, the cube-type morphology of perovskite AL, and shift of the $PbI_2$ peak of the perovskite AL. From these results, it was confirmed that the $TiO_2:TiCl_4$ ETL and the perovskite AL were formed.