Bandgap tuning through the substitution of alkali metal cations in A<sub>2</sub>AlCuF<sub>6</sub> (A = K, Rb, and Cs) for optoelectronic and renewable energy applications.

RSC Adv · 2026 · PMC13227473 · PMID 42239578

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an increasing trendno p-value reported

The electronic bandgap reveals an increasing trend as the A-site is replaced by K → Rb → Cs, revealing indirect bandgaps of 2.80 eV, 2.78 eV and 3.10 eV for K 2 AlCuF 6 , Rb 2 AlCuF 6 and Cs 2 AlCuF 6 , respectively.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.

Bandgap tuning through the substitution of alkali metal cations in A&lt;sub&gt;2&lt;/sub&gt;AlCuF&lt;sub&gt;6&lt;/sub&gt; (A = K, Rb, and Cs) for optoelectronic and renewable energy applications.

The sentences

Bandgap tuning through the substitution of alkali metal cations in A<sub>2</sub>AlCuF<sub>6</sub> (A = K, Rb, and Cs) for optoelectronic and renewable energy applications.