Antimony-Based Ligand Exchange To Promote Crystallization in Spray-Deposited Cu2ZnSnSe4 Solar Cells

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• 作者：Alex Carrete ; Alexey Shavel ; Xavier Fontan茅 ; Joana Montserrat ; Jiandong Fan ; Maria Ib谩帽ez ; Edgardo Saucedo ; Alejandro P茅rez-Rodr铆guez ; Andreu Cabot
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：October 30, 2013
• 年：2013
• 卷：135
• 期：43
• 页码：15982-15985
• 全文大小：342K
• 年卷期：v.135,no.43(October 30, 2013)
• ISSN：1520-5126

文摘

A multistrategy approach to overcome the main challenges of nanoparticle-based solution-processed Cu₂ZnSnSe₄ thin film solar cells is presented. We developed an efficient ligand exchange strategy, using an antimony salt, to displace organic ligands from the surface of Cu₂ZnSnS₄ nanoparticles. An automated pulsed spray-deposition system was used to deposit the nanoparticles into homogeneous and crack-free films with controlled thickness. After annealing the film in a Se-rich atmosphere, carbon-free and crystalline Cu₂ZnSnSe₄ absorber layers were obtained. Not only was crystallization promoted by the complete removal of organics, but also Sb itself played a critical role. The Sb-assisted crystal growth is associated with the formation of a Sb-based compound at the grain boundaries, which locally reduces the melting point, thus promoting the film diffusion-limited crystallization.