Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Study for Improved Photocurrent via High Concentrated Tin-lead Perovskite Precursor Solution

주석-납 기반 페로브스카이트 고농도 전구체 용액을 이용한 광전류 향상 연구

  • Hyojin Hong (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Seungmin Lee (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Jeong Min Im (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Jun Hong Noh (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 홍효진 (건축사회환경공학부, 고려대학교) ;
  • 이승민 (건축사회환경공학부, 고려대학교) ;
  • 임정민 (건축사회환경공학부, 고려대학교) ;
  • 노준홍 (건축사회환경공학부, 고려대학교)
  • Received : 2023.08.07
  • Accepted : 2023.09.04
  • Published : 2023.09.30
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Abstract

Sn-Pb narrow-bandgap perovskite solar cells, which is a light-harvesting layer thicker than 1.3 micrometers, is needed to enhance the low photocurrent. The fabrication of such a thick film through solution processing is a key challenge. Here, we studied and characterized the film by using a precursor solution of increased concentration, comparing it with the universally used 1-micrometer Sn-Pb perovskite film. The increase in molar concentration clearly induced thickness enhancement, but we observed that it also created numerous voids at the interface with bottom charge transporting layer. We hypothesized that these voids might hinder the increase in photocurrent associated with thickness enhancement. By introducing methylammonium chloride (MACl), we successfully fabricated Sn-Pb perovskite film with a thickness of 1.3 micrometer and no voids. Void-controlled Sn-Pb perovskite solar cells not only demonstrated superior short-circuit current density compared to those with voids but also operated smoothly under light exposure.

Keywords

Acknowledgement

This work was also supported by the Challengeable Future Defense Technology Research and Development Program through the Agency for Defense Development (ADD), funded by the Defense Acquisition Program Administration (DAPA) in 2022 (No. UI220006TD). This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (grant nos. RS-2023-00208467 and NRF-2022M3J1A1063226) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Trade, Industry, and Energy (grant nos. 20214000000680).

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