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Monolithic DSSC/CIGS tandem solar cell fabricated by a solution process.

Moon SH, Park SJ, Kim SH, Lee MW, Han J, Kim JY, Kim H, Hwang YJ, Lee DK, Min BK - Sci Rep (2015)

Bottom Line: Tandem architecture between organic (dye-sensitized solar cell, DSSC) and inorganic (CuInGaSe2 thin film solar cell, CIGS) single-junction solar cells was constructed particularly based on a solution process.Arc-plasma deposition was employed for the Pt interfacial layer to minimize the damage to the layers of the CIGS bottom cell.Solar cell efficiency of 13% was achieved, which is significant progress from individual single-junction solar cells (e.g., 7.25 and 6.2% for DSSC and CIGS, respectively).

View Article: PubMed Central - PubMed

Affiliation: Clean Energy Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul. 136-791, Republic of Korea.

ABSTRACT
Tandem architecture between organic (dye-sensitized solar cell, DSSC) and inorganic (CuInGaSe2 thin film solar cell, CIGS) single-junction solar cells was constructed particularly based on a solution process. Arc-plasma deposition was employed for the Pt interfacial layer to minimize the damage to the layers of the CIGS bottom cell. Solar cell efficiency of 13% was achieved, which is significant progress from individual single-junction solar cells (e.g., 7.25 and 6.2% for DSSC and CIGS, respectively).

No MeSH data available.


Related in: MedlinePlus

Cross-sectional scanning electron microscope (SEM) image of bottom CIGS cell (AZO/i-ZnO/CdS/CIGS/Mo) (a), top-view SEM images of the CIGS film only (b) and AZO/i-ZnO/CdS/CIGS film (c), and TEM image of Pt nanoparticles deposited on AZO/i-ZnO/CdS/CIGS film by APD.
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f3: Cross-sectional scanning electron microscope (SEM) image of bottom CIGS cell (AZO/i-ZnO/CdS/CIGS/Mo) (a), top-view SEM images of the CIGS film only (b) and AZO/i-ZnO/CdS/CIGS film (c), and TEM image of Pt nanoparticles deposited on AZO/i-ZnO/CdS/CIGS film by APD.

Mentions: Fig. 3a shows the cross-sectional configuration of the CIGS bottom cell. As shown in the figure, the CIGS thin film shows large-sized grains (~1 μm) with a very low degree of porosity (Figs. 3a and b). Moreover, we could observe an amorphous layer with a thickness of 540 nm at the interfacial region of the Mo substrate, as marked by the dashed lines in Fig. 3a. This amorphous layer could be a residual carbon layer of the type often observed in solution-processed CIGS thin films2627. This hypothesis was further substantiated by Auger electron spectroscopy (AES) for an elemental analysis, which confirmed the presence of carbon near the Mo layer (Supplementary Information, Fig. S2). In addition, the selenization of the Mo substrate resulted in the formation of a MoSe2 layer with a thickness of 580 nm. Furthermore, as shown in Fig. 3a, a CdS buffer layer and i-ZnO and AZO window layers were deposited onto the top surface of the CIGS absorber film. Owing to the deposition of the AZO film, the top surface of the CIGS bottom cell appears to be very dense (Fig. 3c). In particular, we deposited a thicker AZO film (2500 nm), approximately five times thicker than the conventional CIGS solar cell (500 nm), in order to protect the underneath CdS/CIGS layers during the deposition of Pt. Pt deposition by APD (40 pulses) resulted in the formation of smaller Pt nanoparticles on the top of the AZO surface, corresponding to the single-layer thickness of Pt particles (Fig. 3d). The representative single-junction CIGS thin film solar cell (closest one to the average efficiency value, 6.1 ± 0.5%, among the five cells) formed using the ZnO/CdS/CIGS films deposited onto Mo-coated glass shows a power conversion efficiency of 6.2%, with JSC, VOC, and FF values of 26.3 mA/cm2, 450 mV, and 52.3%, respectively (see Fig. 4).


Monolithic DSSC/CIGS tandem solar cell fabricated by a solution process.

Moon SH, Park SJ, Kim SH, Lee MW, Han J, Kim JY, Kim H, Hwang YJ, Lee DK, Min BK - Sci Rep (2015)

Cross-sectional scanning electron microscope (SEM) image of bottom CIGS cell (AZO/i-ZnO/CdS/CIGS/Mo) (a), top-view SEM images of the CIGS film only (b) and AZO/i-ZnO/CdS/CIGS film (c), and TEM image of Pt nanoparticles deposited on AZO/i-ZnO/CdS/CIGS film by APD.
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Related In: Results  -  Collection

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Show All Figures
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f3: Cross-sectional scanning electron microscope (SEM) image of bottom CIGS cell (AZO/i-ZnO/CdS/CIGS/Mo) (a), top-view SEM images of the CIGS film only (b) and AZO/i-ZnO/CdS/CIGS film (c), and TEM image of Pt nanoparticles deposited on AZO/i-ZnO/CdS/CIGS film by APD.
Mentions: Fig. 3a shows the cross-sectional configuration of the CIGS bottom cell. As shown in the figure, the CIGS thin film shows large-sized grains (~1 μm) with a very low degree of porosity (Figs. 3a and b). Moreover, we could observe an amorphous layer with a thickness of 540 nm at the interfacial region of the Mo substrate, as marked by the dashed lines in Fig. 3a. This amorphous layer could be a residual carbon layer of the type often observed in solution-processed CIGS thin films2627. This hypothesis was further substantiated by Auger electron spectroscopy (AES) for an elemental analysis, which confirmed the presence of carbon near the Mo layer (Supplementary Information, Fig. S2). In addition, the selenization of the Mo substrate resulted in the formation of a MoSe2 layer with a thickness of 580 nm. Furthermore, as shown in Fig. 3a, a CdS buffer layer and i-ZnO and AZO window layers were deposited onto the top surface of the CIGS absorber film. Owing to the deposition of the AZO film, the top surface of the CIGS bottom cell appears to be very dense (Fig. 3c). In particular, we deposited a thicker AZO film (2500 nm), approximately five times thicker than the conventional CIGS solar cell (500 nm), in order to protect the underneath CdS/CIGS layers during the deposition of Pt. Pt deposition by APD (40 pulses) resulted in the formation of smaller Pt nanoparticles on the top of the AZO surface, corresponding to the single-layer thickness of Pt particles (Fig. 3d). The representative single-junction CIGS thin film solar cell (closest one to the average efficiency value, 6.1 ± 0.5%, among the five cells) formed using the ZnO/CdS/CIGS films deposited onto Mo-coated glass shows a power conversion efficiency of 6.2%, with JSC, VOC, and FF values of 26.3 mA/cm2, 450 mV, and 52.3%, respectively (see Fig. 4).

Bottom Line: Tandem architecture between organic (dye-sensitized solar cell, DSSC) and inorganic (CuInGaSe2 thin film solar cell, CIGS) single-junction solar cells was constructed particularly based on a solution process.Arc-plasma deposition was employed for the Pt interfacial layer to minimize the damage to the layers of the CIGS bottom cell.Solar cell efficiency of 13% was achieved, which is significant progress from individual single-junction solar cells (e.g., 7.25 and 6.2% for DSSC and CIGS, respectively).

View Article: PubMed Central - PubMed

Affiliation: Clean Energy Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul. 136-791, Republic of Korea.

ABSTRACT
Tandem architecture between organic (dye-sensitized solar cell, DSSC) and inorganic (CuInGaSe2 thin film solar cell, CIGS) single-junction solar cells was constructed particularly based on a solution process. Arc-plasma deposition was employed for the Pt interfacial layer to minimize the damage to the layers of the CIGS bottom cell. Solar cell efficiency of 13% was achieved, which is significant progress from individual single-junction solar cells (e.g., 7.25 and 6.2% for DSSC and CIGS, respectively).

No MeSH data available.


Related in: MedlinePlus