Understanding of the Relationship between the Properties of Cu(In,Ga)Se2 Solar Cells and the Structure of Ag Network Electrodes

Author:

Yoo Hyesun1ORCID,Van Quy Hoang2,Lee Inpyo13,Jo Seung Taek13,Hong Tae Ei4,Kim JunHo4,Yoo Dae‐Hwang1,Shin Jinwook13,Commerell Walter5,Kim Dae‐Hwan2,Roh Jong Wook136ORCID

Affiliation:

1. Regional Leading Research Center (RLRC) of Smart Energy System Kyungpook National University Gyeongsangbuk‐do 37224 Korea

2. Division of Energy Technology Daegu−Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Korea

3. Department of Hydrogen and Renewable Energy Kyungpook National University Daegu 47922 Korea

4. Nano Photoelectronic Device Lab, Department of Physics Incheon National University Incheon 22012 Korea

5. Institute for Energy and Drive Technology Technische Hochschule Ulm (THU) Ulm 89081 Germany

6. Department of Nano & Advanced Materials Science and Engineering Kyungpook National University Gyeongsangbuk‐do 37224 Korea

Abstract

The relation between the structure of the silver network electrodes and the properties of Cu(In,Ga)Se2 (CIGS) solar cells is systemically investigated. The Ag network electrode is deposited onto an Al:ZnO (AZO) thin film, employing a self‐forming cracked template. Precise control over the cracked template's structure is achieved through careful adjustment of temperature and humidity. The Ag network electrodes with different coverage areas and network densities are systemically applied to the CIGS solar cells. It is revealed that predominant fill factor (FF) is influenced by the figure of merit of transparent conducting electrodes, rather than sheet resistance, particularly when the coverage area falls within the range of 1.3–5%. Furthermore, a higher network density corresponds to an enhanced FF when the coverage areas of the Ag networks are similar. When utilizing a thinner AZO film, CIGS solar cells with a surface area of 1.0609 cm2 exhibit a notable performance improvement, with efficiency increasing from 10.48% to 11.63%. This enhancement is primarily attributed to the increase in FF from 45% to 65%. These findings underscore the considerable potential for reducing the thickness of the transparent conductive oxide (TCO) in CIGS modules with implications for practical applications in photovoltaic technology.

Funder

National Research Foundation of Korea

Korea Institute of Energy Technology Evaluation and Planning

Publisher

Wiley

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