Collaboration with Nischal Khakurel (Dr. Miyahara's lab)
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Widebandgap perovskite films for application in underwater and tandem solar cells: scanning probe microscopy on slot-die printed films. |
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Nischal Khakurel.
Texas State University at San Marcos, Department of Physics, RFM 2225, 601 University Drive, San Marcos, TX78666.
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Focus in this project is on developing wide band-gap inks that can be used to slot-die print continuous pin-hole free perovskite films that when incorporated in devices result in a large PCE and a long lifetime. Study focusses on the
optimization of slot-die coating of various lead (Pb) based hybrid perovskite solutions in ambient conditions and use of scanning probe techniques to study nucleation and growth of the printed films and stability of the cells including halide
segregations. 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 300C 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] Nischal Khakurel, Drew Amyx,Maggie Yihong Chen, Yoichi Miyahara, Wilhelmus J. Geerts, "Slot-die coating of Formamidinium-cesium mixed halide perovskites in ambient conditions with FAAc additive", MRS Communications, February 7, 2024, https://doi.org/10.1557/s43579-024-00522-x.[2] C.Q. Howlader, B. Mishra, N. Khakurel, D.W. Amyx, W. Geerts. G. Gibson, M. Chen, “Fabricate anti-solvent free tin-lead based perovskite solar cells with MAAc additives”, SPIE conference proceedings vol. 12209, 1220905-1 1220905-6, (October 4 2022), https://www.spiedigitallibrary.org/proceedings/Download?urlId=10.1117%2F12.2634371&downloadType=proceedings%20article&isResultClick=True [3] C.Q. Howlader, N. Khakurel, D.W. Amyx, W. Geerts, G. Gibson, M. Chen, Pin-Hole free MAPb0.75Sn0.25(I0.5Br0.5)3 films spin casted without anti-solvent by adding MAAc additive to Perovskite ink, Renewable Energy and Power Quality Journal 20, September 2022, pp. X-1-5, ISSN 2172-038 X, https://www.icrepq.com/icrepq22/284-22-howlader.pdf. [4] Jha, Sauraj and Hasan, Mehedhi and Khakurel, Nischal and Ryan, Conor A. and McMullen, Reema and Mishra, Aditya and Malko, Anton V. and Zakhidov, Alexander A. and Slinker, Jason D. "Electrochemical characterization of halide perovskites: Stability & doping" Materials Today Advances , v.13 , 2022. [5] 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] Nischal Khakurel, Craig Swartz, Alex Zakhidov, “Scalable fabrication of perovskite solar cells using the slot-die technique” poster presented at- XXIX International Materials Research Congress, 2021 Aug 15-20, Cancun, Mexico.[2] Chandan Howlader, Nischal Khakurel, Wilhelmus Geerts, Greg Gibson, Maggie Chen, Continuous MASnI3 Perovsite thin films deposited by spin coating without antisolvent treatment, MRS Fall 2022 meeting Boston, November 27 – December 2, 2022. [3] Chandan Q Howlader, B. Mishra, N. Khakurel, D.W. Amyx, W. Geerts, G. Gibson, Maggy Y. Chen, “Fabricate anti-solvent free tin-lead based perovskite solar cells with MAAc additives”, Organic, Hybrid, and Perovskite Photovoltaics XXIII, 23-25 August 2022, 21-21 August 2022, SPIE Optics + Photonics Conference, San Diego, California. [4] C.Q. Howlader, N. Khakurel, D.W. Amyx, W. Geerts, G. Gibson, M. Chen, Pin-Hole free MAPb0.75Sn0.25(I0.5Br0.5)3 films spin casted without anti-solvent by adding MAAc additive to Perovskite ink, poster presentation 20th International Conference on Renewable Energies and Power Quality (ICREPQ’22), Vibo (Spain), 27th to 29th July 2022. [5] 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. [6] Nischal Khakurel, Drew Amyx, Greg Gibson, Yoichi Miyahara, Wilhelmus Geerts, “Formamidinium Acetate additive for antisolvent-free crystallization of wide bandgap hybrid perovskites”, 2022-TSAPS, Rice University Houston, October 13-15 2022. [7] Nischal Khakurel, Greg Gibson, Yoichi Miyahara, Wilhelmus Geerts, “Formamidine Acetate Assisted Antisolvent Free Crystallization of Wide Band-Gap Hybrid Perovskites for Slot-Die Coating”, poster presentation MRS Fall 2022 conference Boston, November 27 -December 2, 2022. [8] Nischal Khakurel, Drew Amyx, Yoichi Miyahara, Wilhelmus J. Geerts, “Additive assisted one-step crystallization of various MA free wide bandgap perovskites”, poster presented at DOE-EM meeting October 17, 2023, TxState University, San Marcos, TX78666. [9] Sujan Pyakurel, Nischal Khakurel, Wilhelmus J. Geerts, “Fabricate Perovskite Solar Cells using Poly-TPD as a Hole Transport Layer with Surfactant PFN-Br”, poster presented at DOE-EM meeting October 17, 2023, TxState University, San Marcos, TX78666. [10] Sujan Pyakurel, Nischal Khakurel, Wilhelmus J. Geerts, “Hole Transport Layer Optimization for a Triple Halide Perovskite Solar Cell using Poly-TPD”, poster presented at the 2023-Fall meeting of the TSAPS, San Angelo State University, October 12-14, 2023. [11] Nischal Khakurel, Chandan Howlader, Greg Gibson, Yoichi Miyahara, Wilhelmus Geerts, “Formamidinium Acetate Assisted Antisolvent Free Crystallization of Wide Band-Gap Hybrid Perovskites for Slot-Die Coating”, poster presentation HOPE workshop, July 10, 2023. [12] Nischal Khakurel, Wilhelmus Geerts, Yoichi Miyahara, “Rapid slot-die coating of high-quality absorber thin films by optimizing DMF/DMSO solvent ratio of triple halide perovskites, poster presentation 2023 TXST STEM Conference, March 24 2023, LBJ Student Center, San Marcos, TX. Nischal graduated in August 2024 and is currently employed with SK Siltron CSS.
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