You may find the answer for your question in the following link:

https://www.meta-synthesis.com/webbook/36_eneg/electroneg.html

Dear wang

Conduction band (CB) and valence band (VB) potentials of semiconductors are calculated using the following empirical equations:

ECB = χ – Ee ‏– 0.5Eg (1)

EVB = ECB + Eg (2)

Where EVB and ECB are the VB and CB potentials, respectively. Moreover, Ee is the energy of free electrons vs. hydrogen (4.5 eV). Finally, χ is the electronegativity of semiconductor and it was calculated by the following equation:

χ = [x(A)ax(B)bx(C)c]1/(a+b+c) (3)

In which a, b, and c are the number of atoms in the compounds. For example, in the case of Cu2CoS4, the calculation procedure is as follows:

χ calculation for Cu2CoS4

For Cu: EIE = 745.5 kj/mol ÷ 96.48 = 7.73 eV

EEA = 119.2 kj/mol ÷ 96.48 = 1.23 eV

XBi = 1/2(7.73+1.23) = 4.48

For Co: EIE = 760.4kj/mol ÷ 96.48 = 7.88 eV

EEA = 64 kj/mol ÷ 96.48 = 0.66 eV

XI = 1/2(7.88+0.66) = 4.27

For S: EIE = 999.6 kj/mol ÷ 96.48 = 10.36 eV

EEA = 200.4 kj/mol ÷ 96.48 = 2.08eV

XS = 1/2(10.36+2.08) = 6.22

XCu2CoS4 = (4.48×4.48×4.27×6.22×6.22×6.22×6.22)1/7 = 5.36

Try this paper for Mark R. Leach :)

https://www.meta-synthesis.com/webbook/documents/LEACH_Basic_Elemental_Property.pdf

Hi, which is the meaning of the values EIE and EEA?