Grain-Boundary-Enhanced Carrier Collection in CdTe Solar Cells

被引：251

作者：

Li, Chen ^{[1
,2
]}

Wu, Yelong ^{[3
]}

Poplawsky, Jonathan ^{[2
,4
]}

Pennycook, Timothy J. ^{[5
,6
]}

Paudel, Naba ^{[3
]}

Yin, Wanjian ^{[3
]}

Haigh, Sarah J. ^{[7
]}

Oxley, Mark P. ^{[8
]}

Lupini, Andrew R. ^{[2
]}

Al-Jassim, Mowafak ^{[9
]}

Pennycook, Stephen J. ^{[4
]}

Yan, Yanfa ^{[3
]}

机构：

[1] Vanderbilt Univ, Dept Chem, Nashville, TN 37235 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[5] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[6] SuperSTEM Lab, Daresbury WA4 4AD, England

[7] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England

[8] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[9] Measurements & Characterizat Grp, Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

CDCL2; TREATMENT; THIN-FILMS; SINGLE-CRYSTAL; ELECTRON-BEAM; RECRYSTALLIZATION; INSULATORS; MICROSCOPY; DIFFUSION;

D O I：

10.1103/PhysRevLett.112.156103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When CdTe solar cells are doped with Cl, the grain boundaries no longer act as recombination centers but actively contribute to carrier collection efficiency. The physical origin of this remarkable effect has been determined through a combination of aberration-corrected scanning transmission electron microscopy, electron energy loss spectroscopy, and first-principles theory. Cl substitutes for a large proportion of the Te atoms within a few unit cells of the grain boundaries. Density functional calculations reveal the mechanism, and further indicate the grain boundaries are inverted to n type, establishing local p-n junctions which assist electron-hole pair separation. The mechanism is electrostatic, and hence independent of the geometry of the boundary, thereby explaining the universally high collection efficiency of Cl-doped CdTe solar cells.

引用

页数：5

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