Deep Level Transient Spectroscopy and Capacitance-Voltage Measurements of Cu(In,Ga)Se2: Preprint

    Research output: Contribution to conferencePaper


    This conference paper describes the electronic properties of ZnO/CdS/Cu(In,Ga)Se2 (CIGS)/Mo/SLG polycrystalline thin-film solar cells with compositions ranging from Cu-rich to In-rich were investigated by deep level transient spectroscopy and capacitance-voltage (C-V) measurements. This compositional change represents the evolution of the film during growth by the three-stage process. Fourthin-film CIGS samples with different Cu content were obtained. The Cu/(In+Ga) ratio ranges from 1.24 (Cu-rich)to 0.88 (In-rich), whereas the Ga/(In+Ga) ratio ranges from 0.19 (Cu-rich)to 0.28 (In-rich).The Cu-rich sample exhibits a shallow majority-carrier trap with an activation energy of 0.12 eV and another deeper trap with an activation energy of 0.28 eV, whereas the In-rich sample has ashallow minority-carrier trap with an activation energy of 0.12 eV. The two samples show evidence of a deeper trap at higher temperature. C-V measurements showed that the average carrier concentration (N values) around the junction of the cell changed as the film transitions from Cu-rich to In-rich. DLTS shows that acceptor-like traps are dominant in samples where CIGS grains did not go throughthe Cu-rich to In(Ga)-rich transition. While donor-like traps are dominant in the In(Ga)-rich samples.
    Original languageAmerican English
    Number of pages7
    StatePublished - 2002
    Event29th IEEE PV Specialists Conference - New Orleans, Louisiana
    Duration: 20 May 200224 May 2002


    Conference29th IEEE PV Specialists Conference
    CityNew Orleans, Louisiana

    Bibliographical note

    Prepared for the 29th IEEE PV Specialists Conference, 20-24 May 2002, New Orleans, Louisiana

    NREL Publication Number

    • NREL/CP-520-32205


    • capacitance voltage (CV)
    • carrier concentration (n values)
    • Cu(In,Ga)Se2 (CIGS)
    • deep level transient spectroscopy (DLTS)
    • donor-like traps
    • growth kinetics
    • majority-carrier
    • polycrystalline thin-film solar cells
    • PV
    • substrate temperature profile
    • three-stage process


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