TY - JOUR
T1 - Highly efficient copper-rich chalcopyrite solar cells from DMF molecular solution
AU - Jiang, Jingjing
AU - Giridharagopal, Rajiv
AU - Jedlicka, Erin
AU - Sun, Kaiwen
AU - Yu, Shaotang
AU - Wu, Sanping
AU - Gong, Yuancai
AU - Yan, Weibo
AU - Ginger, David S.
AU - Green, Martin A.
AU - Hao, Xiaojing
AU - Huang, Wei
AU - Xin, Hao
N1 - Publisher Copyright:
© 2019
PY - 2020/3
Y1 - 2020/3
N2 - Theoretical calculation suggests Cu-rich chalcopyrite absorbers contain less defects and have potential to achieve better performance than Cu-poor absorbers. However, this has not been demonstrated due to the detrimental Cu2-xSe impurity remaining in the absorber. Here, we report highly efficient Cu-rich chalcopyrite solar cells by selenizing dimethylformamide molecular precursor solution processed precursor films under high Ar pressure. Characterizations using XRD, Raman, SEM, TEM, c-AFM, PL, and glow discharge optical emission spectroscopy (GDOES) show high pressure selenization enables high quality Cu-rich chalcopyrite absorber materials with stoichiometric composition, smooth surface, high conductivity, and Cu2-xSe free grain boundaries, leading to efficient CuIn(S,Se)2 and Cu(In,Ga)(S,Se)2 devices with power conversion efficiency of 14.5% and 15.2%, both are the best performing chalcopyrite solar cells from non-hydrazine solutions. Our results demonstrate high Ar pressure selenization is a new strategy to fabricate high quality Cu-rich absorber which has great potential to further improve chalcopyrite solar cell efficiency.
AB - Theoretical calculation suggests Cu-rich chalcopyrite absorbers contain less defects and have potential to achieve better performance than Cu-poor absorbers. However, this has not been demonstrated due to the detrimental Cu2-xSe impurity remaining in the absorber. Here, we report highly efficient Cu-rich chalcopyrite solar cells by selenizing dimethylformamide molecular precursor solution processed precursor films under high Ar pressure. Characterizations using XRD, Raman, SEM, TEM, c-AFM, PL, and glow discharge optical emission spectroscopy (GDOES) show high pressure selenization enables high quality Cu-rich chalcopyrite absorber materials with stoichiometric composition, smooth surface, high conductivity, and Cu2-xSe free grain boundaries, leading to efficient CuIn(S,Se)2 and Cu(In,Ga)(S,Se)2 devices with power conversion efficiency of 14.5% and 15.2%, both are the best performing chalcopyrite solar cells from non-hydrazine solutions. Our results demonstrate high Ar pressure selenization is a new strategy to fabricate high quality Cu-rich absorber which has great potential to further improve chalcopyrite solar cell efficiency.
KW - Chalcopyrite
KW - CIGS
KW - Cu-rich
KW - DMF
KW - High pressure
KW - Selenization
UR - http://www.scopus.com/inward/record.url?scp=85077942559&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2019.104438
DO - 10.1016/j.nanoen.2019.104438
M3 - 文章
AN - SCOPUS:85077942559
SN - 2211-2855
VL - 69
JO - Nano Energy
JF - Nano Energy
M1 - 104438
ER -
