@article{6a40245950084660b84d8d03211aa8de,
title = "Enhanced exciton separation through negative energy band bending at grain boundaries of Cu2ZnSnSe4 thin-films",
abstract = "Local surface potential of Cu2ZnSnSe4 thin-films was investigated by Kelvin probe force microscopy. The surface potential profile across grain boundaries (GBs) shows a rise of 200-600 meV at GBs in a Cu-poor and Zn-poor film with 3.8 efficiency, which means positively charged GBs. In contrast, the GBs in a Cu-poor and Zn-rich film with 2 efficiency exhibit lowering of surface potential by 40 meV. The results indicate that GBs of Cu2ZnSnSe4 films play a role for exciton separation and governing defects for high efficiency could be not only CuZn but also VCu as explained theoretical predictions.",
author = "Jeong, {A. R.} and W. Jo and S. Jung and J. Gwak and Yun, {J. H.}",
note = "Funding Information: This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea (No. 10037233), by KRCF (Korea Research Council of Fundamental Science & Technology), and KIER (Korea Institute of Energy Research) for “NAP (National Agenda Project) program.” This work was supported in part by MEST and DGIST (10-BD-0101, Convergence Technology with New Renewable Energy and Intelligent Robot).",
year = "2011",
month = aug,
day = "22",
doi = "10.1063/1.3626848",
language = "English",
volume = "99",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics",
number = "8",
}