Chemical structures of the Cu (In,Ga) Se2 /Mo and Cu (In,Ga) (S,Se) 2 /Mo interfaces

Physical Review B - Condensed Matter and Materials Physics

Volumn 78, Issue 7, 2008, Pages

  Bar M ^a   Weinhardt, L ^a   Heske, C ^a   Nishiwaki, S ^b   Shafarman, W N ^b  

^a UNIVERSITY OF NEVADA   (United States)

^b UNIVERSITY OF DELAWARE   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 49249091475     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.075404     Document Type: Article

References (44)

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35. According to the densities (ρ) and molar masses (M) for Mo, MoSe2, and MoS2 taken from the 87th Edition of the CRC Handbook of Chemistry and Physics 2006-2007 (http://www.hbcpnetbase.com/), the respective molar densities (n=ρ/M) can be calculated to 0.106, 0.027, and 0.032 mol/ cm3, respectively. Multiplication of the molar density of MoSe2 [MoS2] with the intensity ratio of the Mo3d XPS signal of the "CIGSe [CIGSSe] back" and the Mo side (0.016 [0.026], see text) leads to the "Mo-doping" concentration (under the assumption that the doping profile is homogeneous within the information depth of XPS).
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38. The Gibbs energy of formation for MoSe2 (MoS2) was determined for T=298.16 K according to Δ Gf0 =Δ Hf0 -T ΔS. The enthalpy Δ Hf0 for MoSe2 (MoS2) used for the calculations was -243.2 kJ/mol [-275.3 kJ/mol] taken from V. Ya. Leonidov and P. A. G. O'Hare, Fluorine Calorimetry (Begell House, New York, 1999), p. 194
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40. The change in entropy Δ S MoSe2 / MoS2 = S MoSe2 / MoS2 0 - S Mo 0 -2 S Se/S 0 was calculated from the standard entropies for the respective elements taken from http://www.qivx.com/ispt/ptw_st.php and S MoSe2 0 =83.3 J/Kmol [S MoS2 0 =62.6 J/Kmol]
41. taken from A. V. Blinder, A. S. Bolgar, and Zh. A. Trofimova, Poroshk. Metall. (Kiev) PMANAI 0032-4795 363, 52 (1993)
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43. resulting in Δ S MoSe2 =-30.2 J/Kmol [Δ S MoS2 =-29.7 J/Kmol].
44. For the Mo3d signal intensity reference of the bare (metallic) Mo layer (I0, see Sec. 2), we used the Mo3d intensity of the S-rich Mo (SZ Se1-Z) 2 contribution to the Mo-side spectrum [corrected by the molar ratio nMo / n MoS2 =3.3 (see Ref. for details)].