Effect of different alkali (Li, Na, K, Rb, Cs) metals on Cu2ZnSnSe4 solar cells

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Article; Proceedings Paper

Mule, Aniket^1,2,3  Vermang, Bait^1,3,4  Sylvester, M.^1,3,4  Brammertz, Guy^4,5  Ranjbar, Samaneh^1,3,6  Schnabel, Thomas⁷  Gampa, Nikhil^1,3,8  Meuris, Marc^4,5  Poortmans, Jef^1,3,5 

[1] Imec Partner Solliance, Kapeldreef 75, B-3001 Leuven, Belgium

[2] ETH, LEE K, Dept Mech & Proc Engn D MAVT, Leonhardstr 21, CH-8092 Zurich, Switzerland

[3] Katholieke Univ Leuven, Dept Elect Engn ESAT, Kasteelpk Arenberg 10, B-3001 Heverlee, Belgium

[4] Imec Div IMOMEC Partner Solliance, Wetenschapspk 1, B-3590 Diepenbeek, Belgium

[5] Hassell Univ, Inst Mat Res IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium

[6] Univ Aveiro, Dept Fis I3N, Campus Univ Santiago, P-3810193 Aveiro, Portugal

[7] Zentrum Sonnenenergie & Wasserstoff Forsch ZSW, Ind Str 6, D-70565 Stuttgart, Germany

[8] Ecole Cent Lyon, 36 Ave Guy de Collongue, F-69134 Ecully, France

关键词: CZTSe solar cells;    Alkali metals;    Spin coating;    Sodium;    Potassium;    Kesterites;   

DOI  :  10.1016/j.tsf.2016.11.027

来源: Elsevier

【 摘 要 】

It is well established that the addition of sodium (Na) to chalcopyrite or kesterite based solar cells markedly increases the solar cell performance. In this work, we explore the effect of Na and other alkali metals like potassium (K), rubidium, caesium and lithium (Li) - on pure selenide Cu2ZnSnSe4 (CZTSe) solar cells. We demonstrate the deposition of alkali metals using spin coating on e-beam evaporated metal precursors. The stack of metal precursors with alkali layer was then selenised at high temperatures to obtain a good quality CZTSe absorber. The diffusion of alkali metals into the absorber layer was confirmed using glow discharge optical emission spectroscopy. Samples doped with Na or K have shown improvement in the open circuit voltage. A maximum power conversion efficiency of 8.3% (without anti-reflection coating) and a top open circuit voltage 430 mV was achieved for combination of K and Na. Amongst the rest of alkali metals, Li looks the most promising dopant as far as optoelectronic properties are concerned. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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