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Optimization of The Absorber/Buffer Interface Region of Cu(In,Ga)Se2 Photovoltaic Devices: A Numerical Simulation Study

Patikirige, Yasas R A
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562432266285967

Abstract Details

2019, Master of Science (MS), Bowling Green State University, Physics.
Solar cells based on the compound Copper Indium Gallium Diselenide, Cu(InxGa1-x)Se2, (or CIGS) are commercially important. The electronic properties of CIGS can be controlled by varying the composition. This thesis presents the numerical simulation to optimize the absorber (CIGS)/buffer (CdS) interface region of Cu(In,Ga)Se2 thin-film photovoltaic devices. Experimental data and theory indicate that a Cu-poor CIGS region exists near interface between the CIGS and CdS. It has been implied that the Cu-poor region forms an ordered vacancy compound (OVC) that has significant effects on device performance. In this work, we start with a benchmark device simulation compared to data, then add the OVC layer with variable properties, including the thickness, band gap, electron affinity, doping, and defect concentrations to study the effects on overall device performance. Since the band gap of CIGS can be spatially graded, we also consider the effects of common single and double graded structures. Simulations were carried out using one-dimensional simulation program SCAPS-1D and results reached maximum efficiencies of 20.1% - 20.5% for double graded composition and 22.0% - 22.2% for single graded composition. The electronic properties of the Cu-poor region do not appear to directly improve the device efficiency, yet secondary benefits should be noted, such as reducing surface defects at the CIGS/CdS heterojunction and shunting that may occur with Cu-rich deposition.
Marco Nardone, Dr. (Advisor)
Lewis Fulcher, Dr. (Committee Member)
Haowen Xi, Dr. (Committee Member)
61 p.
Physics
Ordered vacancy compound layer; Cu poor layer; Absorber; Buffer; Interface; Numerical simulations; CIGS

Recommended Citations

Citations

  • Patikirige, Y. R. A. (2019). Optimization of The Absorber/Buffer Interface Region of Cu(In,Ga)Se2 Photovoltaic Devices: A Numerical Simulation Study [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562432266285967

    APA Style (7th edition)

  • Patikirige, Yasas. Optimization of The Absorber/Buffer Interface Region of Cu(In,Ga)Se2 Photovoltaic Devices: A Numerical Simulation Study. 2019. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562432266285967.

    MLA Style (8th edition)

  • Patikirige, Yasas. "Optimization of The Absorber/Buffer Interface Region of Cu(In,Ga)Se2 Photovoltaic Devices: A Numerical Simulation Study." Master's thesis, Bowling Green State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562432266285967

    Chicago Manual of Style (17th edition)

bgsu1562432266285967
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This open access ETD is published by Bowling Green State University and OhioLINK.