Six-Junction Concentrator Solar Cells

被引：20

作者：

Geisz, John F. ^{[1
]}

Steiner, Myles A. ^{[1
]}

Schulte, Kevin L. ^{[1
]}

Young, Matthew ^{[1
]}

France, Ryan M. ^{[1
]}

Friedman, Daniel J. ^{[1
]}

机构：

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

来源：

14TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-14) | 2018年 / 2012卷

关键词：

JUNCTION;

D O I：

10.1063/1.5053512

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

We report on six-junction inverted metamorphic (6J IMM) solar cells developed for concentrator applications. Monolithic III-V structures are grown by metal organic vapor phase epitaxy with junction bandgaps of 2.06, 1.70, 1.40, 1.16, 0.94, and 0.70 eV. The top three junctions are lattice-matched to the GaAs substrate, but the bottom three junctions use three consecutive metamorphic compositionally graded buffers to transition the lattice constant to GaxIn1-xAs compositions with the previously listed bandgaps. Performance of 6J IMM devices at one-sun AM1.5 Direct conditions gives V-OC = 5.301 V, J(SC) = 8.05 mA/cm(2), fill factor = 83.9%, and efficiency = 35.8%. Promising operation at high concentration is achieved but the spectrum was not controlled to AM1.5D. Tunnel junctions do not limit until at least several hundred suns. High concentration performance appears to be limited by internal heterojunction barriers created by zinc diffusion that decreases the fill factor. The properties of each junction within the 6J IMM have been separately characterized through electroluminescence and luminescent coupling measurements.

引用

页数：7

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