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

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 aut...

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Published in:Journal of the American Chemical Society 2013-10, Vol.135 (43), p.15982-15985
Main Authors: Carrete, Alex, Shavel, Alexey, Fontané, Xavier, Montserrat, Joana, Fan, Jiandong, Ibáñez, Maria, Saucedo, Edgardo, Pérez-Rodríguez, Alejandro, Cabot, Andreu
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container_issue 43
container_start_page 15982
container_title Journal of the American Chemical Society
container_volume 135
creator Carrete, Alex
Shavel, Alexey
Fontané, Xavier
Montserrat, Joana
Fan, Jiandong
Ibáñez, Maria
Saucedo, Edgardo
Pérez-Rodríguez, Alejandro
Cabot, Andreu
description 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.
doi_str_mv 10.1021/ja4068639
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title Antimony-Based Ligand Exchange To Promote Crystallization in Spray-Deposited Cu2ZnSnSe4 Solar Cells
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