Improvement of photoluminenscence quantum yield of halide perovskite through structrual modification and nanocrystal synthesis = 할라이드계 페로브스카이트의 구조적 변형 및 나노입자 합성을 통한 광 발광 효율 증대

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Perovskites are attractive for solar absorber materials, with extremely enhanced 22.1% of power conversion efficiency within 5 years. In theory, good solar absorbing materials also could be good light emitting materials, and in addition, the intrinsic property of narrow emission line width (~ 20nm) of perovskite material makes perovskite sas emerging materials for display application. But, the exciton binding energies of perovskite materials are quite low, so generated excitons are easily decomposed as free carriers, result in low PLQY. In this study, we improved PLQY of perovskite materials by structural modification through controlling stoichiometry, and crystal size modification. In $FAPbBr_3$ films with FABr/$PbBr_2$ = 2 nonstoichiometric precursor solutions, we obtained 25% of PLQY by formation of Low-dimensional/3D heterojunction. For nanocrystal synthesis, we achieved 76.2% of PLQY in $CsPbBr_3$, and 29% in lead-free $Cs_3Sb_2Br_9$ nanocrystal.
Advisors
Shin, Byung Haresearcher신병하researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2018.2,[v, 56 p. :]

Keywords

Perovskite▼ananocrystal▼aLight-Emitting Diodes▼aHigh color purity▼aLow-dimensional perovskite structure; 페로브스카이트▼a나노 입자▼a발광소자▼a광 발광 효율▼a고 색순도▼a저차원 구조적 변형

URI
http://hdl.handle.net/10203/266470
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734193&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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