Wet-Transfer of Freestanding Dense Colloidal Quantum Dot Films and Their Photonic Device Application

被引：8
作者：
Han, Changhyun [1 ,2 ]
Jung, Hyunho [1 ,2 ]
Lee, Jongho [1 ,2 ]
Lee, Myungjae [1 ,2 ]
Park, Yeonsang [3 ]
Cho, Kyung-Sang [3 ]
Jeon, Heonsu [1 ,2 ]
机构：
[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea
[2] Seoul Natl Univ, Interuniv Semicond Res Ctr, Seoul 08826, South Korea
[3] Samsung Adv Inst Technol, Suwon 16678, South Korea
来源：
ADVANCED MATERIALS TECHNOLOGIES | 2018年 / 3卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
colloidal quantum dots; distributed feedback lasers; freestanding films; wet-transfer methods; LIGHT-EMITTING-DIODES; AUGER RECOMBINATION; OPTICAL GAIN; SEMICONDUCTOR NANOCRYSTALS; LASERS; SUPPRESSION; EMISSION;
D O I：
10.1002/admt.201700291
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A method of wet-transferring a densely packed colloidal quantum dot (CQD) film is reported herein. Layers of poly(vinyl alcohol) (sacrificial layer) and poly(methyl methacrylate) (temporary mechanical support) are spin-coated below and above the CQD film, respectively; the two layers are eventually removed, resulting in a single CQD film on an alien substrate. CQD films as large as 1 cm x 1 cm are transferred to any substrate, including flexible and prepatterned ones, with very little mechanical or optical damage. The wet-transfer method can be repeated to form a CQD heterostructure. A CQD distributed feedback (DFB) laser is also demonstrated by transferring a thick CdSe-based CQD layer (for both optical gain and waveguiding) on top of a surface grating structure. The resultant CQD structure exhibits a single-mode DFB lasing action, with a high spontaneous emission factor (beta approximate to 10(-3)), owing to a strong vertical mode confinement and smooth surface morphologies on both sides of the CQD waveguide layer.
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收藏
页数：6
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