Abstract
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.
| Original language | English |
|---|---|
| Article number | 195203 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 89 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 2014 May 20 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Slow intraband relaxation and localization of photogenerated carriers in CuIn1-x Gax Se2 thin films : Evidence for the existence of long-lived high-energy carriers. / Okano, Makoto; Takabayashi, Yutaro; Sakurai, Takeaki; Akimoto, Katsuhiro; Shibata, Hajime; Niki, Shigeru; Kanemitsu, Yoshihiko.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 19, 195203, 20.05.2014.Research output: Contribution to journal › Article
}
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.
UR - http://www.scopus.com/inward/record.url?scp=84901478272&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901478272&partnerID=8YFLogxK
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 -