The calculated band gap in comparison with the available experimental and theoretical data, effective masses of conductive electron and hole and reduced effective mass in the unit of free electron mass (m_e), static dielectric constant (ε_s), and exciton properties including exciton binding energy (E_b) and exciton radius for HDPs Cs₂AgBX₆ (B = In, Sb; X = F, Cl, Br, I). The values in the brackets indicate the previous data.

Compound	E g (eV)	Effective mass			ε s	Exciton property
						E b (meV)	(nm)
Cs2AgInF6	4.74	0.409	1.332	0.313	2.170	904	0.367
Cs2AgInCl6	3.02 (3.3a)	0.272 (0.29a)	0.520 (0.28a)	0.178	2.760	319	0.819
Cs2AgInBr6	1.78 (1.5b)	0.161	0.381	0.113	3.750	110	1.750
Cs2AgInI6	0.06	0.106	0.297	0.078	7.321	20	4.958
Cs2AgSbF6	4.94	0.588	0.760	0.332	2.119	1005	0.338
Cs2AgSbCl6	3.32 (3.43c)	0.354	0.429	0.194	2.639 (4.77c)	379 (434c)	0.719 (0.56c)
Cs2AgSbBr6	2.30 (2.74c)	0.269	0.373	0.156	3.345 (5.96c)	190 (247c)	1.132 (0.76c)
Cs2AgSbI6	1.40	0.194	0.325	0.121	4.634	77	2.020

^aExperiment and PBE0 calculation.⁵¹

^bExperiment.⁶⁸

^cGW calculation.³⁰