Energy-band alignment of II-VI/Zn3P2 heterojunctions from x-ray photoemission spectroscopy

被引：23

作者：

Bosco, Jeffrey P. ^{[1
,2
,3
]}

Scanlon, David O. ^{[4
]}

Watson, Graeme W. ^{[5
,6
]}

Lewis, Nathan S. ^{[1
,2
,3
]}

Atwater, Harry A. ^{[1
,2
,3
]}

机构：

[1] CALTECH, Watson Lab, Pasadena, CA 91125 USA

[2] CALTECH, Noyes Lab, Beckman Inst, Pasadena, CA 91125 USA

[3] CALTECH, Kavli Nanosci Inst, Pasadena, CA 91125 USA

[4] UCL, Kathleen Lonsdale Mat Chem, Dept Chem, London WC1H 0AJ, England

[5] Trinity Coll Dublin, Sch Chem, Coll Green, Dublin 2, Ireland

[6] Trinity Coll Dublin, CRANN, Coll Green, Dublin 2, Ireland

来源：

JOURNAL OF APPLIED PHYSICS | 2013年 / 113卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

MOLECULAR-BEAM EPITAXY; PRECISE DETERMINATION; COMPOUND-SOURCE; ZN3P2; GROWTH; SEMICONDUCTORS; CONDUCTIVITY; EVAPORATION; LIMITS; EDGE;

D O I：

10.1063/1.4807646

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The energy-band alignments for zb-ZnSe(001)/alpha-Zn3P2(001), w-CdS(0001)/alpha-Zn3P2(001), and w-ZnO(0001)/alpha-Zn3P2(001) heterojunctions have been determined using high-resolution x-ray photoelectron spectroscopy via the Kraut method. Ab initio hybrid density functional theory calculations of the valence-band density of states were used to determine the energy differences between the core level and valence-band maximum for each of the bulk materials. The ZnSe/Zn3P2 heterojunction had a small conduction-band offset, Delta E-C, of -0.03+/-0.11 eV, demonstrating a nearly ideal energy-band alignment for use in thin-film photovoltaic devices. The CdS/Zn3P2 heterojunction was also type-II but had a larger conduction-band offset of Delta E-C = -0.76+/-0.10 eV. A type-III alignment was observed for the ZnO/Zn3P2 heterojunction, with Delta E-C = -1.61+/-0.16 eV indicating the formation of a tunnel junction at the oxide-phosphide interface. The data also provide insight into the role of the II-VI/Zn3P2 band alignment in the reported performance of Zn3P2 heterojunction solar cells. (C) 2013 AIP Publishing LLC.

引用

页数：8

共 52 条

[21] Passivation of Zn3P2 substrates by aqueous chemical etching and air oxidation [J].

Kimball, Gregory M. ;

Bosco, Jeffrey P. ;

Mueller, Astrid M. ;

Tajdar, Syed F. ;

Brunschwig, Bruce S. ;

Atwater, Harry A. ;

Lewis, Nathan S. .

JOURNAL OF APPLIED PHYSICS, 2012, 112 (10)

[22] MG DOPING AND ALLOYING IN ZN3P2 HETEROJUNCTION SOLAR CELLS [J].

Kimball, Gregory M. ;

Lewis, Nathan S. ;

Atwater, Harry A. .

35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 2010, :1039-1043

[23] Photoluminescence-based measurements of the energy gap and diffusion length of Zn3P2 [J].

Kimball, Gregory M. ;

Mueller, Astrid M. ;

Lewis, Nathan S. ;

Atwater, Harry A. .

APPLIED PHYSICS LETTERS, 2009, 95 (11)

[24]

Kittel C., 2004, INTRO SOLID STATE PH

[25] PRECISE DETERMINATION OF THE VALENCE-BAND EDGE IN X-RAY PHOTOEMISSION SPECTRA - APPLICATION TO MEASUREMENT OF SEMICONDUCTOR INTERFACE POTENTIALS [J].

KRAUT, EA ;

GRANT, RW ;

WALDROP, JR ;

KOWALCZYK, SP .

PHYSICAL REVIEW LETTERS, 1980, 44 (24) :1620-1623

[26] SEMICONDUCTOR CORE-LEVEL TO VALENCE-BAND MAXIMUM BINDING-ENERGY DIFFERENCES - PRECISE DETERMINATION BY X-RAY PHOTOELECTRON-SPECTROSCOPY [J].

KRAUT, EA ;

GRANT, RW ;

WALDROP, JR ;

KOWALCZYK, SP .

PHYSICAL REVIEW B, 1983, 28 (04) :1965-1977

[27] AB-INITIO MOLECULAR-DYNAMICS SIMULATION OF THE LIQUID-METAL AMORPHOUS-SEMICONDUCTOR TRANSITION IN GERMANIUM [J].

KRESSE, G ;

HAFNER, J .

PHYSICAL REVIEW B, 1994, 49 (20) :14251-14269

[28] Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set [J].

Kresse, G ;

Furthmuller, J .

COMPUTATIONAL MATERIALS SCIENCE, 1996, 6 (01) :15-50

[29] Comparison of CdS films deposited by different techniques: Effects on CdTe solar cell [J].

Lee, J .

APPLIED SURFACE SCIENCE, 2005, 252 (05) :1398-1403

[30] Alternative sources of p-type conduction in acceptor-doped ZnO [J].

Limpijumnong, Sukit ;

Gordon, Luke ;

Miao, Maosheng ;

Janotti, Anderson ;

Van de Walle, Chris G. .

APPLIED PHYSICS LETTERS, 2010, 97 (07)

← 1 2 3 4 5 6 →