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Cu 2 ZnSn(S,Se) 4 solar cell absorbers processed from Na‐containing solutions in DMSO
Author(s) -
Werner M.,
SutterFella C. M.,
Hagendorfer H.,
Romanyuk Y. E.,
Tiwari A. N.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431146
Subject(s) - doping , dimethyl sulfoxide , solar cell , materials science , sodium , salt (chemistry) , metal , layer (electronics) , chemical engineering , optoelectronics , chemistry , nanotechnology , organic chemistry , metallurgy , engineering
Cu 2 ZnSn(S,Se) 4 absorbers were processed from metal salt solutions in dimethyl sulfoxide (DMSO) and annealed in reactive Se atmosphere. A simple way to introduce sodium doping by adding NaCl to the initial precursor solution is presented. The additional sodium has no significant effect on the absorber morphology, but it improves the device performance from 5.01% to 6.09%. The sodium doping clearly reduces the recombination rate as manifested in a higher J sc. and enhanced carrier collection. It is also shown that the absorber layer thickness should be optimized to ∼1.5 µm. By reducing the absorber thickness we found a facile way to extend the well crystallized top crust over the whole absorber and thus improve the solar cell performance.