Anisotropic hole-mass tensor of CuIn1-xGax(S,Se)2: Presence of free carriers narrows the energy gap

Persson, Clas
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p072106
Academic Journal
Analysis of the band edges of CuIn1-xGax(S,Se)2 with x=0.0, 0.5, and 1.0 reveals that (i) CuIn1-xGaxS2 has larger effective electron mc and hole mv masses than CuIn1-xGaxSe2; (ii) whereas Ga content affects band curvatures only slightly, the sign of the crystal-field split Δcf as well as the spin-orbit coupling affect mv strongly; (iii) the optical response [variant_greek_epsilon]2(hω) is comparable for all six compounds; and (iv) band filling of electrons (n=1019 cm-3) and holes (p=n) narrows the band gap by Eg≈Eg0-0.1 eV and generates an optical band gap of Egopt≈Eg+0.2 eV.


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