Title :
Compositional dependence photoluminescence study of polycrystalline CuGaSe2 thin films
Author :
Muhammad Monirul Islam;Hajime Shibata;Koji Matsubara;Shigeru Niki;Takeaki Sakurai;Katsuhiro Akimoto
Author_Institution :
Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Ibaraki 305-8573, Japan
fDate :
6/1/2015 12:00:00 AM
Abstract :
CuGaSe2 thin films with different Cu/Ga ratio were studied using photoluminescence (PL) method. Measurement at 1.4 K shows asymmetrically broadened PL spectra for all the samples where PL-peaks shift to lower energy with a decrease of the Cu/Ga ratio. Excitation power and temperature dependent PL spectra were explained using donor to acceptor pair transition under the influence of potential fluctuation. Magnitude of the potential fluctuation was calculated from lower energy tail of the emission spectra. Effect of Cu-deficiency on the properties of the CuGaSe2 films and fabricated solar cells were discussed in relation to the potential fluctuation at the band-edge.
Keywords :
"Fluctuations","Temperature measurement","Films","Photovoltaic cells","Semiconductor device measurement","Photonic band gap","Photoluminescence"
Conference_Titel :
Photovoltaic Specialist Conference (PVSC), 2015 IEEE 42nd
DOI :
10.1109/PVSC.2015.7355791
