Rose's webpage
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Stability of Perovskite films for Solar Cells: Ellipsometry and FTIR study. |
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Rose Najar..
Texas State University at San Marcos, Department of Physics, RFM 2225, 601 University Drive, San Marcos, TX78666.
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Focus is on the stability of perovskite thin films deposited by spin-casting and slot-die printing. Optical methods including FTIR, ellipsometry, and XRD are used to learn more about the stability of wide bandgap perovskite thin films. Films are made in the Alex Zakhidov organic semiconductor lab. The lab is furnished with a LC Tech glovebox cluster consisting of a wet glovebox with spin coating and annealing capabilities for solvent based deposition of organic semiconductor thin films and a dry glovebox housing a Trovato 300 thermal deposition system used for the deposition of electron and hole transport layers through shadow masks up to 1 square inch and a UV-expoxy dispensing and curing robot to encapsulate samples and devices. In addition the lab contains an nTact slot die printer for coating of samples up to 4 inch wide in a controlled atmosphere (temperature, pressure, humidity). Specific characterization equipment include two solar simulator setups, and a setup to measure the external quantum efficiency of the photovoltaic devices and optical detectors. These systems support research on organic semiconductor thin films and devices interesting for applications in LEDs, displays, solar panels, and electronic devices. Research in this lab relies greatly on characterization equipment available through the SRO including electron microscopy, EDS, XPS, AFM, XRD, UV/VIS, FTIR, ellipsometry, and various electrical characterization setups including linear 4pp, CV setup, PPMS electrical characterization tool, and the semiconductor parameter analyzer/wafer prober station. Publications: [1] C.H. Swartz, N. Khakurel, S.R. Najar, M.I. Hossain, A. Zakhidov, “Temperature‐ and Bias‐Dependent Degradation and Regeneration of Perovskite Solar Cells with Organic and Inorganic Hole Transport Layers”, PSS A, 2000721 (2021).Presentations/Posters: [1] Selena Rose Najar, Joselyn Lesikar, Binod D.C., Luisa Scolfaro, Wilhelmus J. Geerts, “Temperature Dependence of the Magnetic Properties of Reactive RF Sputtered NiFeO Thin Films”, Fall-2018 TSAPS presentation, October 15, Houston.[2] Selena Rose Najar, Joselyn Lesikar, Binod D.C., Luisa Scolfaro, Wilhelmus Geerts, “Preliminary Temperature Dependence of the Magnetic Properties of Reactive RF Sputtered NiFeO Thin Films”, Symposium for Undergraduate Research Exploration 2018, University of Texas at Austin, October 4, 2018. [3] Selena R. Najar, Craig H. Swartz, Alex Zakhidov, “The Solubility Parameters of Methylammonium Acetate Ionic Liquid For Perovskite Photovoltaic Application, virtual poster presentation XXIX International Materials Research Congress, MRS meeting Cancun, August 2021. [4] Selena Rose Najar, Nischal Khakurel, Drew Amyx, Alex Zakhidov, Wilhelmus J. Geerts, “Wide Range Optical Stability Study of Ionic Based Hybrid Perovskites for Solar Cells”, 2022-TSAPS, Rice University Houston, October 13-15 2022. Rose is enrolled in our MSc. Physics graduate program
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