Quantum confinement in germanium nanocrystal thin films

被引：14

作者：

Holman, Zachary C. ^{[1
]}

Kortshagen, Uwe R. ^{[1
]}

机构：

[1] Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2011年 / 5卷 / 03期

关键词：

nanocrystals; germanium; band gap; absorption; SILICON NANOCRYSTALS; DOTS; GE; PHOTOLUMINESCENCE; SUPERLATTICES; MATRICES; GAP;

D O I：

10.1002/pssr.201105031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin films of semiconductor nanocrystals with tunable optical properties are promising materials for new device applications, but progress has been slow for group IV materials. We report absorption measurements near the absorption edge of thin films of germanium nanocrystals synthesized in a plasma and impacted onto substrates. Band gaps extracted from the absorption data vary from the near-bulk value of 0.73 eV for 9.0 nm nanocrystals to over 1.0 eV for 4.7 nm nanocrystals. These values are comparable to those reported for isolated, non-interacting germanium nanocrystals, indicating minimal loss of quantum confinement upon dense film formation. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：110 / 112

页数：3

共 18 条

[1]

Adachi S., 1999, Optical Constants of Crystalline and Amorphous Semiconductors

[2] CHARACTERIZATION OF A BULK SEMICONDUCTORS BAND-GAP VIA A NEAR-ABSORPTION EDGE OPTICAL-TRANSMISSION EXPERIMENT [J].

ESSICK, JM ;

MATHER, RT .

AMERICAN JOURNAL OF PHYSICS, 1993, 61 (07) :646-649

[3] MODIFYING STRUCTURE AND PROPERTIES OF OPTICAL FILMS BY COEVAPORATION [J].

FELDMAN, A ;

FARABAUGH, EN ;

HALLER, WK ;

SANDERS, DM ;

STEMPNIAK, RA .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 1986, 4 (06) :2969-2974

[4] Nonthermal plasma synthesis of size-controlled, monodisperse, freestanding germanium nanocrystals [J].

Gresback, Ryan ;

Holman, Zachary ;

Kortshagen, Uwe .

APPLIED PHYSICS LETTERS, 2007, 91 (09)

[5]

Heath JR, 1998, CHEM SOC REV, V27, P65

[6] A flexible method for depositing dense nanocrystal thin films: impaction of germanium nanocrystals [J].

Holman, Z. C. ;

Kortshagen, U. R. .

NANOTECHNOLOGY, 2010, 21 (33)

[7] Germanium and Silicon Nanocrystal Thin-Film Field-Effect Transistors from Solution [J].

Holman, Zachary C. ;

Liu, Chin-Yi ;

Kortshagen, Uwe R. .

NANO LETTERS, 2010, 10 (07) :2661-2666

[8] Solution-Processed Germanium Nanocrystal Thin Films as Materials for Low-Cost Optical and Electronic Devices [J].

Holman, Zachary C. ;

Kortshagen, Uwe R. .

LANGMUIR, 2009, 25 (19) :11883-11889

[9] Silicon nanocrystals with ensemble quantum yields exceeding 60% [J].

Jurbergs, David ;

Rogojina, Elena ;

Mangolini, Lorenzo ;

Kortshagen, Uwe .

APPLIED PHYSICS LETTERS, 2006, 88 (23)

[10] Colloidal Synthesis of Infrared-Emitting Germanium Nanocrystals [J].

Lee, Doh C. ;

Pietryga, Jeffrey M. ;

Robel, Istvan ;

Werder, Donald J. ;

Schaller, Richard D. ;

Klimov, Victor I. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2009, 131 (10) :3436-+

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