The fox and the hound: In-depth and in-grain Na doping and Ga grading in Cu(In,Ga)Se2 solar cells

Diego Colombara*, Kevin Conley, Maria Malitckaya, Hannu Pekka Komsa, Martti J. Puska

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Cu(In,Ga)(S,Se)2 (CIGS) thin film solar cells require appropriate depth and lateral distributions of alkali metal dopants and gallium to attain world record photovoltaic energy conversion. The two requirements are interdependent because sodium is known to hamper In/Ga interdiffusion in polycrystalline films. However, such a fact is challenged by recent findings where sodium appears to enhance In/Ga interdiffusion in monocrystalline films. This contribution reviews closely the two cases to the benefits of grain boundary engineering in CIGS. A computational model reveals why Na induces In accumulation at CIGS grain boundaries, confining Ga to grain interiors. The positive technological implications for wider gap chalcopyrites are stressed.

Original languageEnglish
Pages (from-to)6471-6479
Number of pages9
JournalJournal of Materials Chemistry A
Issue number14
Publication statusPublished - 14 Apr 2020
MoE publication typeA1 Journal article-refereed

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