Engineering the A-site cations in (Na/K/Rb)<sub>3</sub>InBr<sub>6</sub> halides for enhanced optoelectronic and thermoelectric performance in renewable energy devices.

For the studied halides, the electrical conductivity shows an increasing trend as the temperature is increased, and the maximum values for Na 3 InBr 6, K 3 InBr 6 and Rb 3 InBr 6 are obtained as 1.44 × 10 19 1 Ω −1 m −1 , 1.02 × 10 19 1 Ω −1 m −1 and 8.21 × 10 18 1 Ω −1 m −1 at 800 K, respectively, as depicted in Fig. 7(a) .

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The reported bulk modulus suggests a decreasing trend in the materials resilience towards external strain when the A-site cation is replaced as Na → K → Rb.

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