The Journal of the Convergence on Culture Technology (문화기술의 융합)

The International Promotion Agency of Culture Technology (국제문화기술진흥원)
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Synthesis and Characteristic Evaluation of Downward Conversion Phosphor for Improving Solar Cell Performance

태양전지 성능향상을 위한 하향변환 형광체의 합성 및 특성평가

  • 김재호 (한라대학교 화학공학과) ;
  • 김가람 (한라대학교 화학공학과) ;
  • 최진토 (한라대학교 화학공학과) ;
  • 김수종 (한라대학교 화학공학과)
  • Received : 2023.07.12
  • Accepted : 2023.09.05
  • Published : 2023.09.30
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Abstract

The applicability as a material to improve solar cell performance was reviewed by synthesizing a phosphor that emits red wavelengths by a liquid synthesis method using a metal salt aqueous solution and a polymer medium as a starting material. An aqueous solution was prepared using nitrate of metals such as Ca, Zn, Al, and Eu, and a precursor impregnated with starch, a natural polymer, was sintered to synthesize CaZnAlO:Eu phosphor powder. The surface structure and composition analysis of the synthesized CaZnAlO:Eu phosphor powder were analyzed by scanning electron microscope(SEM) and energy-dispersed X-ray spectroscopy(EDS). The crystal structure of CaZnAlO:Eu phosphor particles was analyzed by an X-ray diffraction analyzer (XRD). As a result of measuring the photoluminescence(PL) characteristics of the phosphor, it was confirmed that a red phosphor with a light emitting wavelength of 650-780nm was successfully synthesized. According to SEM and EDS analysis, the synthesized Ca14Zn6Al9.93O35:Eu3+0.07 phosphor powder has a uniform particle size, and Eu ions used as an activator are present. The synthesized CZA:Eu3+ phosphor can be used as a material that can increase the light absorption efficiency of the solar cell by converting ultraviolet or visible light down conversion into a wavelength in the near-infrared region.

금속염 수용액과 고분자 매개체를 출발물질로 사용한 액상합성법으로 적색 파장을 방출하는 형광체를 합성하여, 태양전지 성능향상을 위한 소재로서의 적용 가능성을 검토하였다. Ca, Zn, Al, Eu 등 금속의 질산염을 사용하여 수용액을 제조하고 이것을 식물성 고분자인 전분에 함침시킨 전구체를 소결하여 CaZnAlO:Eu 형광체 분말을 합성하였다. 합성한 CaZnAlO:Eu 형광체 분말의 표면구조 및 성분분석을 주사전자현미경(SEM)과 에너지분산형 X-선분광법(EDS)으로 분석하였다. PL측정 결과 650-780nm의 근적외선영역의 발광파장을 가지는 적색형광체가 성공적으로 합성되었다. XRD 분석결과 단일상을 가진 순수한 CZA:Eu3+ 형광체가 합성된 것을 확인하였다. SEM, EDS 분석 결과 합성한 Ca14Zn6Al9.93O35:Eu3+0.07 형광체 분말의 입도가 균일하며, 부활제로 사용한 Eu 이온이 존재하고 있는 것을 알 수 있다. 합성된 CZA:Eu3+ 형광체는 자외선이나 가시광선을 근적외선영역의 파장으로 하향변환하여 태양전지의 광 흡수효율을 높일 수 있는 소재로 활용될 수 있다.

Keywords

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