Title :
Experimental and theoretical study on band gap tuning of Cu2ZnSn(S1−xSex)4 absorbers for thin-film solar cells
Author :
Weiwei Sun ; Xiumei Geng ; Armstrong, J.C. ; Jingbiao Cui ; Tar-Pin Chen
Author_Institution :
Dept. of Phys. & Astron., Univ. of Arkansas at Little Rock, Little Rock, AR, USA
Abstract :
A non-hydrazine solution followed by spin-coating has been used to produce Cu2ZnSnS4 (CZTS) precursor. After annealed with sulfur or selenium powders in tube furnace at 530°C, Cu2ZnSn(S1-x Sex)4 (CZTSSe) thin films were obtained. Both theoretical calculation and experimental results showed that band gap can be tuned from 1.48 to 1.04eV by replacing S with Se in CZTSSe. Solar cell devices were fabricated using nominally CZTS and CZTSe absorbers with thickness around 500 nm. The device based on CZTSSe shows better performance than the CZTS device owing to the larger grain size and better electronic transport.
Keywords :
copper compounds; energy gap; solar cells; spin coating; thin film devices; tin compounds; zinc compounds; Cu2ZnSn(S1-xSex)4; Cu2ZnSnS4; absorbers; band gap tuning; electron volt energy 1.48 eV to 1.04 eV; electronic transport; grain size; nonhydrazine solution; precursor; spin-coating; temperature 530 degC; thin-film solar cells; tube furnace; Annealing; Green products; Indexes; Photonic band gap; Photovoltaic cells; Substrates; Zinc; Band gap; CZTSSe; Solar cells; Solution;
Conference_Titel :
Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th
Conference_Location :
Denver, CO
DOI :
10.1109/PVSC.2014.6924949
