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Macroscopic and microscopic electrical properties of Cu(In,Ga)Se-2 thin-film solar cells with various Ga/(In plus Ga) contents

Title
Macroscopic and microscopic electrical properties of Cu(In,Ga)Se-2 thin-film solar cells with various Ga/(In plus Ga) contents
Authors
Kim, Gee YeongJo, WilliamJo, Hyun-JunKim, Dae-HwanKang, Jin-Kyu
DGIST Authors
Kim, Dae-HwanKang, Jin-Kyu
Issue Date
2015-09
Citation
Current Applied Physics, 15, S44-S50
Type
Article
Article Type
Article; Proceedings Paper
Keywords
Atomic Force MicroscopyConductive Atomic Force MicroscopyConductive FilmsConversion EfficiencyCopperCu(In, Ga)SeCu(In, Ga)Se2Device PropertiesEfficiencyElectric ResistanceElectrical BehaviorsEnergy GapGa/(In + Ga)GalliumGrain BoundariesMacroscopic and MicroscopicSemiconducting Selenium CompoundsSeries ResistancesShunt ResistancesSolar CellsThin-Film Solar CellsThin-Films
ISSN
1567-1739
Abstract
CuIn1-xGaxSe2 (CIGS) thin-films were deposited by a three-stage co-evaporation process. We obtained an optimum value for the Ga/(In + Ga) ratio of CIGS solar cells of 0.29, which exhibits a band-gap of 1.14 eV and has the highest conversion efficiency. The Ga/(In + Ga) ratio in CIGS solar cells is one of main characteristics that can improve efficiency, but the optimum value is still uncertain. In this study, we investigated the local electrical properties, which are closely related to the device properties, of CIGS according to the Ga/(In + Ga) ratio. We measured the local current of the films using conductive atomic force microscopy. The local current indicates relatively small values for the current ratio and the average current on the film surface, which has a high shunt resistance and a low series resistance in high-efficiency CIGS thin-films. However, low efficiency CIGS exhibits the opposite electrical behavior. Thus, the macroscopic and microscopic electrical behaviors are closely correlated with the conversion efficiency and with the device factors of CIGS thin-film solar cells with a varying Ga/(In + Ga) ratio. These results suggest that the control of carrier transport over the grains will improve the conversion efficiency of CIGS thin-film solar cells. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/5172
DOI
10.1016/j.cap.2015.04.036
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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