Local built-in potential on grain boundary of Cu(In,Ga)Se2 thin films

被引：175

作者：

Jiang, CS ^{[1
]}

Noufi, R ^{[1
]}

AbuShama, JA ^{[1
]}

Ramanathan, K ^{[1
]}

Moutinho, HR ^{[1
]}

Pankow, J ^{[1
]}

Al-Jassim, MM ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 18期

关键词：

D O I：

10.1063/1.1737796

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on a direct measurement of two-dimensional potential distribution on the surface of photovoltaic Cu(In,Ga)Se-2 thin films using a nanoscale electrical characterization of scanning Kelvin probe microscopy. The potential measurement reveals a higher surface potential or a smaller work function on grain boundaries of the film than on the grain surfaces. This demonstrates the existence of a local built-in potential on grain boundaries, and the grain boundary is positively charged. The local built-in potential on the grain boundary is expected to increase the minority-carrier collection area from one to three dimensional. In addition, a work function decrease induced by Na on the film surface was observed. (C) 2004 American Institute of Physics.

引用

页码：3477 / 3479

页数：3

共 17 条

[1] Cross-sectional atomic force microscopy imaging of polycrystalline thin films [J].

Ballif, C ;

Moutinho, HR ;

Hasoon, FS ;

Dhere, RG ;

Al-Jassim, MM .

ULTRAMICROSCOPY, 2000, 85 (02) :61-71

[2] SURFACE STATES AND RECTIFICATION AT A METAL SEMI-CONDUCTOR CONTACT [J].

BARDEEN, J .

PHYSICAL REVIEW, 1947, 71 (10) :717-727

[3] Spatially resolved photoluminescence measurements on Cu(In,Ga)Se2 thin films [J].

Bothe, K ;

Bauer, GH ;

Unold, T .

THIN SOLID FILMS, 2002, 403 :453-456

[4] Estimation of diffusion lengths in CuInSe2-based cells using the photocurrent-capacitance method [J].

Champness, CH .

CONFERENCE RECORD OF THE TWENTY-NINTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE 2002, 2002, :732-735

[5]

Contreras MA, 1999, PROG PHOTOVOLTAICS, V7, P311, DOI 10.1002/(SICI)1099-159X(199907/08)7:4<311::AID-PIP274>3.0.CO

[6]

2-G

[7] Solar cell efficiency tables (version 17) [J].

Green, MA ;

Emery, K ;

King, DL ;

Igari, S ;

Warta, W .

PROGRESS IN PHOTOVOLTAICS, 2001, 9 (01) :49-56

[8] Na-induced effects on the electronic structure and composition of Cu(In,Ga)Se-2 thin-film surfaces [J].

Heske, C ;

Fink, R ;

Umbach, E ;

Riedl, W ;

Karg, F .

APPLIED PHYSICS LETTERS, 1996, 68 (24) :3431-3433

[9] Measurement of built-in electrical potential in III-V solar cells by scanning Kelvin probe microscopy [J].

Jiang, CS ;

Moutinho, HR ;

Friedman, DJ ;

Geisz, JF ;

Al-Jassim, MM .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (12) :10035-10040

[10] Changes in the dominant recombination mechanisms of polycrystalline Cu(In,Ga)Se2 occurring during growth [J].

Keyes, BM ;

Dippo, P ;

Metzger, WK ;

AbuShama, J ;

Noufi, R .

JOURNAL OF APPLIED PHYSICS, 2003, 94 (09) :5584-5591

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