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RISS 인기검색어
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- 저자 : Hideyuki Takakura (검색결과 6 건)
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Cu(In,Ga)Se2 superstrate-type solar cells with Zn1−xMgxO buffer layers
Takashi Minemoto,Shinya Harada,Hideyuki Takakura 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Superstrate-type Cu(In,Ga)Se2 (CIGS) thin film solar cells were fabricated using Zn1-xMgxO buffer layers. Due to the diffusion of Cd into CIGS during the growth of the CIGS layer, the conventional buffer material of CdS is not suitable. ZnO is a good candidate because of higher thermal tolerance but the conduction band offset (CBO) of ZnO/CIGS is not appropriate. In this study, the Zn1-xMgxO buffer layers were used to fulfill both the requirements. The superstrate-type solar cells with a soda-lime glass/In2O3:Sn/Zn1-xMgxO/CIGS/Au structure were fabricated with different band gap energies of the Zn1-xMgxO layer. The CIGS layers [Ga/(In + Ga)~0.25] were deposited by co-evaporation method. The substrate temperature during the CIGS deposition of 450 ℃ did not cause the intermixing of the Zn1-xMgxO and CIGS layers. The conversion efficiency of the cell with Zn1-xMgxO was higher than that with ZnO due to the improvement of open-circuit voltage and shunt resistance. The results well corresponded to the behavior of the adjustment of CBO, demonstrating that the usefulness of the Zn1-xMgxO layer for the CBO control in the superstrate-type CIGS solar cells. Superstrate-type Cu(In,Ga)Se2 (CIGS) thin film solar cells were fabricated using Zn1-xMgxO buffer layers. Due to the diffusion of Cd into CIGS during the growth of the CIGS layer, the conventional buffer material of CdS is not suitable. ZnO is a good candidate because of higher thermal tolerance but the conduction band offset (CBO) of ZnO/CIGS is not appropriate. In this study, the Zn1-xMgxO buffer layers were used to fulfill both the requirements. The superstrate-type solar cells with a soda-lime glass/In2O3:Sn/Zn1-xMgxO/CIGS/Au structure were fabricated with different band gap energies of the Zn1-xMgxO layer. The CIGS layers [Ga/(In + Ga)~0.25] were deposited by co-evaporation method. The substrate temperature during the CIGS deposition of 450 ℃ did not cause the intermixing of the Zn1-xMgxO and CIGS layers. The conversion efficiency of the cell with Zn1-xMgxO was higher than that with ZnO due to the improvement of open-circuit voltage and shunt resistance. The results well corresponded to the behavior of the adjustment of CBO, demonstrating that the usefulness of the Zn1-xMgxO layer for the CBO control in the superstrate-type CIGS solar cells.
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Photo current metastability in Cu(In,Ga)Se2 solar cells with controlled conduction band alignment
Hiroaki Hori,Takashi Minemoto,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
A metastability of current density–voltage characteristics, so called a light soaking (LS) effect, in (Zn,Mg)O (ZMO)/Cu(In,Ga)Se2 (CIGS) solar cells with the controlled conduction band offset (CBO) between window and CIGS layers was measured. The strong LS effect was observed with increasing the CBO value from +0.03 eV to +0.35 eV. Here, plus sign of CBO indicate the conduction band minimums of the window layers above that of the CIGS layers. When the CBO is positive, the CBO acts as a barrier for photo-generated electrons in the CIGS layer. On the other hand, the CIGS solar cells with Cd partial electrolyte treatment for the CIGS surface before the ZMO deposition showed the negligible LS effect. These results indicate that the LS effect would relate to the photo current which is affected by CBO and surface condition of the CIGS film, and the external quantum efficiency measurements support this hypothesis.
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Fabrication of Cu(In, Ga)Se2 thin film solar cell absorbers from electrodeposited bilayers
Yusuke Oda,Masakazu Matsubayashi,Takashi Minemoto,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
CuInSe2 (CIS) and Cu(In, Ga)Se2 (CIGS) films as solar cell absorbers have been fabricated from electrodeposited (ED) In–Se/CIS and CIS/CuGaSe2 (CGS) bilayers, respectively. Firstly, In–Se/CIS bilayers were intermixed by annealing at 600 ℃ for 10 min and it followed that CIS films with large grains and controlled compositional ratios were realized. CIS solar cells using these films showed around 2.2% efficiency. Next,CIS/CGS bilayers were annealed at 600 ℃ for 60 min for intermixing. Here, oxygen-free CGS films prepared from Cu–Ga–Se solution added Li2SO4 as the supporting electrolyte were used because Ga–O compound formed in ED-CGS films worked as the defects. As the results, around 2.9% efficiency CIGS solar cell using the films was realized. Especially, 29.7 mA/㎠ and 36.1 mA/㎠ high short-circuit current density were obtained in the CIS and CIGS solar cells, respectively. These results indicate that ED-bilayers technique is useful to realize low-cost and high efficiency solar cell.
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Outdoor performance evaluation of photovoltaic modules using contour plots
Takashi Minemoto,Hiroaki Takahashi,Yasuhito Nakada,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The impact of environmental parameters on different types of Si-based photovoltaic (PV) modules (single crystalline Si (sc-Si), amorphous Si (a-Si) and a-Si/ microcrystalline Si (μc-Si)) which have different spectral responses were characterized using contour plots. The contour plots of PV performance as a function of module temperature and spectral irradiance distribution were created to separate the impact of the two environmental parameters. The performance of the sc-Si PV module was dominated by the module temperature while those of a-Si and a-Si/lc-Si ones were mainly influenced by the spectral irradiance distribution. Furthermore, the frequency of outdoor conditions and the reliability of the contour plots of the PV performance were discussed for the evaluation of PV modules by means of energy production.
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Yasuhito Nakada,Hiroaki Takahashi,Kyoko Ichida,Takashi Minemoto,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Influences of clearness index (Kt) and air mass (AM) on both the sunlight and the outdoor performance of photovoltaic (PV) modules were analyzed. The Kt and AM strongly affect the intensity of solar irradiation and spectral irradiance distribution. In this study, the impacts of Kt and AM on an index for spectral irradiance distribution of average photon energy (APE) are analyzed using a contour maps and then the impacts of the environmental factors on the outdoor performance of single crystalline Si (sc-Si) and amorphous Si (a-Si) PV modules is discussed. As the result, it was found that APE increases with decreasing the Kt and AM. Furthermore, it was found that the outdoor performance of a-Si PV modules strongly depended on APE compared to sc-Si PV modules. Thus, APE can be estimated from the contour map with the Kt and AM.
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