Collaboration with Chandan Howlader (Dr. Chen's lab)

Binod DC: Magnetic Characterization.

Sn based pervoskite solar cells for printable electronics.

Chandan Howlader

Chandan Howlader.

Texas State University at San Marcos, Department of Physics, RFM 2225, 601 University Drive, San Marcos, TX78666.

Focus is on tin-based perovskite films that can be deposited by one-step spin-casting and/or printing. Preliminary experiments in our lab have shown that substitution of Pb with Sn can result in perovskite films that are less susceptible for halide segregation. Focus is on ink and device development of novel perovskite precursor solutions. 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] 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
[2] 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.
[3] C. Howlader, M. Hasan, A. Zakhidov, M.Y. Chen, “Determining the refractive index and the dielectric constant of PPDT2FBT thin film using spectroscopic ellipsometry“, Opt. Mat. 110, 110445 (2020).
[4] Arjun Sapkota, Leo Rodriguez, Binod D.C, Kolton Dieckow, Chandan Howlader, Jitendra Tate, Wilhelmus Geerts, "On the origin of systematic errors in VSM Torque Curves", AIP Advances 14, 1, 015048, 2024, On the origin of systematic errors in VSM torque curves | AIP Advances | AIP Publishing (impact factor 1.697).
[5] Chandan Howlader, Maggie Chen, Wilhelmus J. Geerts, "Antisolvent free deposition of lead-tin-based MAPbxSn1-x(I0.75Br0.25)3 perovskite with a wide range of bandgap variation", submitted to MRS Communications, September 15 2023.
[6] C.Q. Howlader, W. Geerts, Y.M. Chen, “Selection of hole transport layer for Pb-Sn binary perovskite solar cells”, Proceedings of the SPIE 12659 (2023) 1265908, pp. 1-9, Organic, Hybrid, and Perovskite Photovoltaics XXIII, https://doi.org/10.1117/12.2678004 (impact factor 0.37).

Presentations/Posters:

[1] 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.
[2] 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.
[3] 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.
[4] Arjun Sapkota, Leo Rodriguez, Binod D.C, Kolton Dieckow, Chandan Howlader, Jitendra Tate, Wilhelmus Geerts, "On the origin of systematic errors in VSM Torque Curves", poster presentation MMM-2023 conference, 10/30/2023-11/3/2023, Dallas.
[5] Chandan Howlader, W. Geerts, Y. M. Chen, “Selection of hole transport layer for Pb-Sn binary perovskite solar cells”, SPIE Organic Photonics + Electronics, 20-25 August 2023, San Diego, California.

Chandan graduated from our MSEC PhD. program at Texas State University in spring 2023 and is currently working for ElectronInk in Austin.