화학공학소재연구정보센터
학회 한국화학공학회
학술대회 2020년 가을 (10/14 ~ 10/16, e-컨퍼런스)
권호 26권 1호, p.645
발표분야 재료
제목 Enhancement of Photoluminescence Quantum Yield of Lead Halide Perovskite using Passivation Layer of Lead Sulfate
초록 Lead halide perovskite (LHP) has drawn attention in the optoelectronic field because of its bandgap tunability, strong luminescence and a narrow emission wavelength width. However, the application of LHP is still limited because of poor stability, especially in the presence of water. In this work, we report a simple strategy of passivating perovskite with lead sulfate layer by introducing sulfuric acid solution. The synthesized lead halide perovskite, MAPbBr3, reacted with sulfate ion and the perovskite surfaces were passivated with lead sulfate. The bright green-emitting perovskite maintained its luminescence in the liquid water for weeks because water-insoluble lead sulfate strongly bound to the perovskite surfaces by chemical bonds. The passivated LHPs were characterized using scanning electron microscopy (SEM), X-ray diffractometer (XRD) and photoluminescence (PL) spectroscopy. The photoluminescence quantum yield of passivated LHPs was remarkably increased from 2.6% to 80% with narrow full width at half maximum of about 20 nm.
저자 고은영, 김도현
소속 한국과학기술원
키워드 화공재료
E-Mail dohyun.kim@kaist.edu
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