TY - JOUR
T1 - Slow intraband relaxation and localization of photogenerated carriers in CuIn1-x Gax Se2 thin films
T2 - Evidence for the existence of long-lived high-energy carriers
AU - Okano, Makoto
AU - Takabayashi, Yutaro
AU - Sakurai, Takeaki
AU - Akimoto, Katsuhiro
AU - Shibata, Hajime
AU - Niki, Shigeru
AU - Kanemitsu, Yoshihiko
PY - 2014/5/20
Y1 - 2014/5/20
N2 - The dynamics of free carriers in polycrystalline CuIn1-xGaxSe2 (CIGS) thin films were studied using picosecond time-resolved photoluminescence (PL) and femtosecond transient-absorption (TA) measurements. The PL spectrum and the TA decay component due to the band-to-band recombination of free carriers were observed in the picosecond time region. From excitation-photon-energy-dependent TA measurements, we identified a slow intraband relaxation of free carriers in the CIGS thin films. Collectively, the combination of PL and TA experiments reveal a global feature of energy relaxation and recombination processes of free carriers in the femtosecond to nanosecond time regions.
AB - The dynamics of free carriers in polycrystalline CuIn1-xGaxSe2 (CIGS) thin films were studied using picosecond time-resolved photoluminescence (PL) and femtosecond transient-absorption (TA) measurements. The PL spectrum and the TA decay component due to the band-to-band recombination of free carriers were observed in the picosecond time region. From excitation-photon-energy-dependent TA measurements, we identified a slow intraband relaxation of free carriers in the CIGS thin films. Collectively, the combination of PL and TA experiments reveal a global feature of energy relaxation and recombination processes of free carriers in the femtosecond to nanosecond time regions.
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U2 - 10.1103/PhysRevB.89.195203
DO - 10.1103/PhysRevB.89.195203
M3 - Article
AN - SCOPUS:84901478272
VL - 89
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 19
M1 - 195203
ER -