화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.88, 137-147, August, 2020
DOI10.1016/j.jiec.2020.03.040  Export Citation
Enhanced colloidal stability of perovskite quantum dots via split-ligand re-precipitation for efficient bi-functional interlayer in photovoltaic application
Minseong Kim, Byung Gi Kim, Jin Young Kim, Woongsik Jang, and Dong Hwan Wang†
  • School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
E-mail:
A split-ligand mediated re-precipitation (Split-LMRP) technique for colloidal perovskite quantum dots (QDs) was designed by separately dissolving rich oleic acid (OA) and amine ligands in the synthesis process. OA was used to control the polarity of the nucleation environment and was simultaneously employed as a stabilizer. The Split-LMRP technique allowed purification via the precipitation of QDs from a colloidal solution. The fabrication process is performed under ambient conditions, and the resulting CH3NH3PbX3 (X = Br, I) QDs exhibited strong photoluminescence (PL) emission with a maximum PL quantum yield of 91.5%. The size of the resulting perovskite QDs is tuned in the range of 2-5 nm by varying the ligand concentration and type of halide. We also investigated the charge-transport properties of the synthesized QDs using space-charge-limited current analysis and confirmed stable charge carrier mobility even when the QDs solution was spin-coated on a hydrophilic poly (3,4-ethylenedioxythio- phene) polystyrene sulfonate film. Furthermore, the enhanced stability of CH3NH3PbX3 (X = Br, I) QDs improved the power conversion efficiency by the uniform surface passivation of the perovskite active layer which induces efficient exciton generation and charge transport.
Keywords:Quantum dots;Halide perovskite;Semiconductor nanocrystals;Nanoparticle;Perovskite solar cells
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