DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Shin, Byung Ha | - |
dc.contributor.advisor | 신병하 | - |
dc.contributor.author | Shin, Min Gue | - |
dc.date.accessioned | 2019-09-03T02:46:01Z | - |
dc.date.available | 2019-09-03T02:46:01Z | - |
dc.date.issued | 2017 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=867028&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/266475 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2017.8,[v, 47 p. :] | - |
dc.description.abstract | Perovskite has a solar cell power conversion efficiency of 22.1% as emerging photovoltaic material. Perovskite has potential as light emitting material because good solar cell materials can be a good light emitting material. Perovskite LEDs has attracted attention as a high color purity display with a narrow FWHM of 20 nm of emission spectrum due to its inherent defect density. However, since the exciton binding energy is low, the excitons easily dissociate to free-carriers and causes low efficiency. So we have formed a low-dimensional perovskite structure which has high exciton binding energy through stoichiometry control. In this study we have spin-coated organic-inorganic hybrid perovskite ($MAPbBr_3$) thin films by controlling molar ratio of MABr/$PbBr_2$ from 1 to 2 in precursor solution. When MABr was excessed than PbBr2, films emit the brightest photoluminescence (PL) light. For MABr/$PbBr_2$ = 2, a new crystal phase found from XRD and FT-IR. It indicates low-dimensional perovskite ($MA_nPbX_{2+n}$) was formed. Moreover we have deposited all-inorganic perovskite ($CsPbBr_3$) thin films by thermal co-evaporation which is vacuum process. And we controlled flux ratio of CsBr/$PbBr_2$ to 0.5, 1 and 2. When flux ratio of CsBr/$PbBr_2$ = 2, films showed the high photoluminescence quantum yield (PLQY) of 70% and it has pure phase of zero-dimensional $Cs_4PbBr_6$ from XRD and Raman spectrum. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Perovskite▼alight-emitting diodes▼ahigh color purity▼alow-dimensional perovskite▼astructure modification | - |
dc.subject | 페로브스카이트▼a발광 다이오드▼a고 색순도▼a저차원 페로브스카이트▼a구조 변화 | - |
dc.title | Structure modification of halide perovskite to low-dimensions for efficient Light-Emitting Diodes | - |
dc.title.alternative | 발광다이오드를 위한 할라이드계 페로브스카이트의 저차원 구조 변화 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 신민규 | - |
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