Post-deposition treatment of Cu2ZnSnSe4 with alkalis

THIN SOLID FILMS

卷:633

Article; Proceedings Paper

Rey, G.¹  Babbe, F.¹  Weiss, T. P.¹  Elanzeery, H.¹  Melchiorre, M.¹  Valle, N.²  El Adib, B.²  Siebentritt, S.¹ 

[1] Lab Photovolta LPV, Phys & Mat Sci Res Unit, 41 Rue Brill, L-4422 Belvaux, Luxembourg

[2] LIST, 41 Rue Brill, L-4422 Belvaux, Luxembourg

关键词: Kesterite;    Copper zinc tin selenide;    Sodium;    Potassium;    Post-deposition treatment;   

DOI  :  10.1016/j.tsf.2016.11.021

来源: Elsevier

【 摘 要 】

Low temperature post-deposition treatment of Cu2ZnSnSe4 with NaF and KF significantly improved the solar cell efficiency (from 6.4% to 7.8% and 7.7% on average, respectively) due to enhanced fill factor (from 0.58 to 0.61 and 0.62), open-circuit voltage (V-oc) (from 314 mV to 337 mV and 325 mV) and short-circuit current density (from 35.3 mA.cm(-2) to 38.3 mA.cm(-2) and 38.6 mA.cm(-2)). V-oc improvement was higher for solar cells with NaF treatment due to an increase in radiative efficiency at room temperature and shallower defect activation energy as determined by photoluminescence (PL) and temperature dependent admittance spectroscopy, respectively. In the case of KF treatment, red-shift of the PL, higher band tail density of state and donor activation energy deeper in the band gap were limiting further improvement of the V-oc compared to NaF treatment. (C) 2016 The Authors. Published by Elsevier B.V.

【 授权许可】

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