Layer transfer of Cu(In,Ga)Se&lt;inf&gt;2&lt;/inf&gt; thin-film to alternative substrate and application to solar cells

Minemoto, Takashi; Anegawa, Takaya; Osada, Shintaro; Takakura, Hideyuki

doi:10.1109/pvsc.2009.5411694

Cited by 1 publication

(5 citation statements)

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“…The low LBIC signal would be attributed to the poor electric property of the back contact/CIGS layers due to an insufficient adhesion or the increase in the CIGS crystal defects introduced by the stress. In our previous report on the lift-off CIGS cell on the SLG alternative substrate, 12) a cracklike LBIC distribution was observed. However, there was no apparent crack in this study.…”

Section: Resultsmentioning

confidence: 76%

“…The double diode behavior in this study was less prominent than that indicated in our previous report on the lift-off CIGS solar cell with the Mo back contact. 12) However, the lift-off CIGS solar cells with the Au back contact still suffered from the back contact property. From a material point of view, Au should make an ohmic contact with CIGS; thus, the double diode behavior may be induced by the insufficient coverage of the Au layer on the CIGS surface or the contact between Au and the conductive epoxy.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, we deposited Mo as a back contact of a liftoff cell, but the device showed a severely low fill factor because of a double diode behavior due to the Schottky contact between nonreacted Mo/CIGS interfaces. 12) Thus, in this study, Au was used as a back contact material. After the Au deposition, sintering at 250 C for 30 min in N 2 ambient was performed.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Lift-off CIGS solar cells with an alternative-substrate/ epoxy/Au/CIGS/CdS/ZnO/ITO/NiCr-Al-grid structure based on the stacked layers were completed using our baseline process. 12) The active cell area was 0.12 cm 2 (0:2 Â 0:6 cm 2 ). The process temperature for the CdS deposition was 80 C. ZnO, In 2 O 3 :Sn (ITO), and NiCr-Algrid were deposited without intentional substrate heating, resulting in process temperatures below 100 C. Thus, the process temperatures after the attachment of the alternative substrates were below 100 C, indicating the possibility of the use of low-thermal-tolerance substrate materials as low as 100 C. As a reference, a CIGS solar cell with an SLG/ Mo/CIGS/CdS/ZnO/ITO/NiCr-Al-grid structure, i.e., a standard cell without the lift-off process, was also prepared.…”

Section: Au Evaporationmentioning

confidence: 95%

“…In our previous study, we developed a simple lift-off process without an intentional sacrificial layer between the back contact and CIGS layers, and also showed preliminary working devices. 11,12) In this paper, we report on the first results for a flexible CIGS solar cell based on a PTFE film with a low thermal tolerance of $260 C.…”

Section: Introductionmentioning

confidence: 99%

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Lift-Off Process for Flexible Cu(In,Ga)Se₂ Solar Cells

Minemoto¹,

Abe²,

Anegawa

et al. 2010

Jpn. J. Appl. Phys.

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A lift-off process for flexible Cu(In,Ga)Se2 (CIGS) solar cells was developed. After the growth of a CIGS thin film on a Mo/glass substrate at 550 °C, the CIGS film was transferred to polyimide and poly(tetrafluoroethylene) films. Process temperatures for the device fabrication after the transfer were less than 100 °C. The conversion efficiencies of the lift-off CIGS solar cells were similar and were almost one-half that of a CIGS solar cell prepared by a standard process. The difference was mainly due to the low fill factor caused by a poor back-contact property and the low short-circuit current caused by an inappropriate band gap profile in the CIGS layer. There still remain problems related to the improvement in efficiency; however, this is the first report on flexible CIGS solar cells on a low-thermal-tolerance substrate. We demonstrated the possibility of freedom of substrate material choice in CIGS solar cells.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Au Evaporationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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