The effects of staggered bandgap in the InP/CdSe and CdSe/InP core/shell quantum dots

Kim, Sunghoon; Park, Jaehyun; Kim, Sungwoo; Jung, Won; Sung, Jaeyoung; Kim, Sang-Wook

doi:10.1016/j.jcis.2010.03.030

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The effects of staggered bandgap in the InP/CdSe and CdSe/InP core/shell quantum dots

Kim, Sunghoon;
Park, Jaehyun;
Kim, Sungwoo;
Jung, Won;
Sung, Jaeyoung;
외 1명

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12

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13

초록

New type-II structures of CdSe/InP and InP/CdSe core-shell nanocrystals which have staggered bandgap alignment were fabricated. Using a simple model for the wave function for electrons and holes in InP/CdSe and CdSe/InP core/shell nanocrystals showed the wave function of the electron and hole spread into the shell, respectively. The probability density of the InP/CdSe and CdSe/InP core/shell QDs also showed a similar tendency. As a result, the structure exhibits increased delocalization of electrons and holes, leading to a red-shift in absorption and emission. Quantum yield increased in the InP/CdSe, however decreased in the CdSe/InP. The reason may be due to the surface trap and high activation barrier for de-trapping in the InP shell. (C) 2010 Elsevier Inc. All rights reserved.

키워드

Type-II quantum dots; Core-shell; InP; CdSe; Bandgap; CORE-SHELL NANOCRYSTALS; HIGH-QUALITY INP; INP/ZNS NANOCRYSTALS; RAPID SYNTHESIS; PHOTOPHYSICS; GROWTH

제목: The effects of staggered bandgap in the InP/CdSe and CdSe/InP core/shell quantum dots

저자: Kim, Sunghoon; Park, Jaehyun; Kim, Sungwoo; Jung, Won; Sung, Jaeyoung; Kim, Sang-Wook

DOI: 10.1016/j.jcis.2010.03.030

발행일: 2010-06

유형: Article

저널명: Journal of Colloid and Interface Science

권: 346

호: 2

페이지: 347 ~ 351

언어: ENG

출판사: ACADEMIC PRESS INC ELSEVIER SCIENCE

발행국가: 미국

분량: 5 페이지

ISSN: E 1095-7103
P 0021-9797