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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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Morphological-Electrical Property Relation in Cu(In,Ga)(S,Se)(2) Solar Cells: Significance of Crystal Grain Growth and Band Grading by Potassium Treatment

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Title
Morphological-Electrical Property Relation in Cu(In,Ga)(S,Se)(2) Solar Cells: Significance of Crystal Grain Growth and Band Grading by Potassium Treatment
Author
Kim, Joo-HyunKim, Min KyuGadisa, AbayStuard, Samuel J.Nahid, Masrur MorshedKwon, SoyeongBae, SoohyunKim, ByoungwooPark, Gi SoonWon, Da HyeLee, Dong KiKim, Dong-WookShin, Tae JooDo, Young RagKim, JihyunChoi, Won JunAde, HaraldMin, Byoung Koun
Issue Date
2020-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v.16, no.48, pp.2003865
Abstract
Solution-processed Cu(In,Ga)(S,Se)(2) (CIGS) has a great potential for the production of large-area photovoltaic devices at low cost. However, CIGS solar cells processed from solution exhibit relatively lower performance compared to vacuum-processed devices because of a lack of proper composition distribution, which is mainly instigated by the limited Se uptake during chalcogenization. In this work, a unique potassium treatment method is utilized to improve the selenium uptake judiciously, enhancing grain sizes and forming a wider bandgap minimum region. Careful engineering of the bandgap grading structure also results in an enlarged space charge region, which is favorable for electron-hole separation and efficient charge carrier collection. Besides, this device processing approach has led to a linearly increasing electron diffusion length and carrier lifetime with increasing the grain size of the CIGS film, which is a critical achievement for enhancing photocurrent yield. Overall, 15% of power conversion efficiency is achieved in solar cells processed from environmentally benign solutions. This approach offers critical insights for precise device design and processing rules for solution-processed CIGS solar cells.
URI
https://scholarworks.unist.ac.kr/handle/201301/48781
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/smll.202003865
DOI
10.1002/smll.202003865
ISSN
1613-6810
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