Choi Lab

Department of Chemical Engineering,
University of Virginia
Em
ail: jjc6z[at]virginia[dot]edu
Phone: 434-243-1822
Webmaster: Alex Chen
102 Engineers' Way
P.O. Box 400741
Charlottesville, VA
22904-4741
102 Engineers' Way
P.O. Box 400741
Charlottesville, VA
22904-4741
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Choi Laboratory for Optoelectronic Nanomaterials
Department of Chemical Engineering
September 2014: Prof. Choi gave an invited talk at the UVa Department of Physics.

September 2014: Ben passed his Q exam. Congratulations!

August, 2014: Daniel Marlowe, a 4th year undergraduate student, joins the lab. Welcome!!

August, 2014: Prof. Choi starts at UVa after finishing his postdoctoral stint at Columbia Univ.

May, 2014: Ben Foley (1st year graduate student) joins the research group even before Prof. Choi arrives at UVa. He will be performing experiments in our collaborator Prof. Mool Gupta lab until our lab is set up & also perform DFT calculations. Welcome, Ben!! (celebration at a cigar bar in NYC. The first group pic!)
October, 2014: Our new glovebox system is up and running now!
November, 2014: Ben and Tianran (A collaborator in group of Prof. Seung-Hun Lee in UVa physics department) successfully finished experiments at NIST National Center for Neutron Research. Lots of very intriguing results!

November, 2014: Matt Alpert and Alex Chen, 1st year graduate students, join the research group. Welcome!! (celebration at the Boylan Heights)
March, 2015: Prof. Choi presents an invited talk at the American Physical Society March Meeting 2015, San Antonio, TX.

February, 2015: Prof. Choi gave an invited seminar at the Department of Electrical and Computer Engineering of UVa.

January, 2015: Justin Girard, a 2nd year undergraduate student, joins the lab. Welcome!!

December, 2014: Ben gave an oral presentation on his work on temperature dependent energy levels of methylammonium lead iodide perovskite at MRS Fall 2014 meeting to an audience of hundreds of researchers.
March 2015: Alex the solar cell master!
April, 2015: Prof. Joshua Choi wins the NASA Virginia Space Grant Consortium New Investigator Award! We are very grateful for the support.
May 2015: Daniel graduated from the UVa ChE undergraduate program. Congratulations! (celebration at the World of Beer)
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June, 2015: Ben’s paper “Temperature dependent energy levels of methylammonium lead iodide perovskite” is published in Applied Physics Letters.

June 2015: High school students and Choi group members had lots of fun learning about solar cells & making our own black berry solar cells. (through the Introduction to Engineering program of the Center for Diversity in Engineering)
July, 2015: Ben, Justin and Josh completed an extremely successful & exciting 1 week beamtime run at D-1 line of the Cornell High Energy Synchrotron Source.
July, 2015: Sarah gave a presentation on her summer REU research. Great job!
August, 2015: Prof. Joshua Choi is selected for a NASA Early Career Faculty Award! This funding will enable our research group to work on next generation solar cell technologies for future space missions. We are very grateful for the support.
September, 2015: Alex and Matt passed their Q exams and have become PhD candidates. Congratulations!

September, 2015: 4 new undergraduate researchers join the lab: Shelby Cuthriell, Jonathan Lee, Jennifer Ma and Sina Yazdi. Welcome!

August, 2015: Choi lab celebrates the beginning of a new academic year & receiving the NASA ECF award at Orzo.
October, 2015: In collaboration with Prof. Seunghun Lee (UVa, physics) and Tianran Chen, Ben's co-first author paper on rotational dynamics of organic cations in CH3NH3PbI3 perovskites has been accepted for publication in Physical Chemistry Chemical Physics. Congratulations!

October, 2015: Xiaoyu Deng, 1st year graduate student, joined the research group. Welcome!

October, 2015: Choi group, in collaboration with Lee group in UVa Department of Physics, performed another successful experiment at NIST National Center for Neutron Research. lots of interesting results!

September, 2015: Prof. Choi presented an invited seminar at the Department of Chemical and Biomolecular Engineering at University of Houston.
January, 2016: In collaboration with Gupta lab, a paper on charge transport in bulk CH3NH3PbI3 perovskites has been accepted for publication in Journal of Applied Physics.

January, 2016: Michelle Shiu joined the group as an undergraduate researcher. Welcome!

January, 2016: Dr. Scott Niezgoda joined the group as a postdoctoral researcher. Welcome!

December, 2015: Ben, Alex and Matt have finished another successful a week-long X-ray beamtime run at the Cornell High Energy Synchrotron Source. Lots of very exciting results! Papers to come!

November, 2015: Ben and Prof. Choi gave oral presentations at the 2015 AIChE annual meeting, Salt Lake City, UT.

November, 2015: The group celebrates the new members and paper publication at the World of Beer.
May, 2016: Congratulations to Shelby Cuthriell for winning nanoSTAR undergraduate summer research award! The award will enable Shelby to perform research on perovskite solar cells in our lab during the summer.

May, 2016: Prof. Choi gave an invited talk at the Oak Ridge National Laboratory.

March, 2016: Prof. Choi gave an invited talk at the American Chemical Society Annual Meeting at San Diego, CA.

March, 2016: Prof. Choi and Prof. Simon Billinge (at Columbia Univ.) served as guest editors for a special themed issue titled "Perovskites at the nanoscale: from fundamentals to applications" in Nanoscale. The editorial can be read
here.
June, 2016: Our joint research grant with Prof. Seunghun Lee (in UVa physics department) will be funded from the Department of Energy Basic Energy Sciences! This funding will enable our team to investigate the impact of organic cation structure and dynamics on solar cell performance of hybrid organic-inorganic perovskites. We are very grateful for the support.
June, 2016: Choi group celebrated beginning of the summer at the World of Beer. Good times!
June, 2016: Prof. Choi gave an invited talk at the CHESS-U Workshop 2016, Materials Design and Processing from Nano to Mesoscale.
June, 2016: Ben, Alex, Xiaoyu (Choi group) and Stephanie, Nan (Giri group) had a very successful & fun 1 week long beamtime at CHESS. Lots of interesting results and fun memories!
June, 2016: In 2nd year in a row, high school students and Choi group members had lots of fun making our own black berry solar cells and learn about solar cells. (through the Introduction to Engineering program of the Center for Diversity in Engineering)
July, 2016: Prof. Choi gave an invited talk “Understanding and controlling the preferential orientation of metal halide perovskite thin films for high performance solar cells” at the 66th Annual Meeting of the American Crystallographic Association, Denver, CO.
July, 2016: Our research on metal halide perovskite thin film growth has been featured in news articles.
September, 2016: In collaboration with Prof. Wissam Saidi at the U. of Pittsburgh, our paper on "“Nature of the Cubic to Tetragonal Phase Transition in Methylammonium Lead Iodide Perovskite” has been accepted for publication in the Journal of Chemical Physics.
September, 2016: In collaboration with Prof. Seunghun Lee, our paper on “Entropy Driven Structural Transition and Kinetic Trapping in Formamidinium Lead Iodide Perovskite” has been accepted for publication in Science Advances!!
September, 2016: Choi group welcomes 2 new Ph.D. students (Katelyn Dagnall and Lucy Yoon) and 2 new undergraduate researchers (Xu He and Sydney Stenseth) to the group. Welcome!!
October, 2016: Choi group celebrates the new group members and paper publications. Good times!
October, 2016: Our research recently published in Science Advances is featured in UVA Today article.



October, 2016: Ben's paper titled "
Controlling Nucleation, Growth, and Orientation of Metal Halide Perovskite Thin Films with Rationally Selected Additives" has been accepted for publication in Journal of Materials Chemistry A!! Congratulations!
April, 2017: Scott's paper titled "Improved Charge Collection in Highly Efficient CsPbBrI2 Solar Cells with Light-Induced Dealloying" has been accepted for publication in ACS Energy Letters!! Congratulations!

April, 2017: Alex's paper titled
"Crystallographic Orientation Propagation in Metal Halide Perovskite Thin Films" has been accepted for publication in Journal of Materials Chemistry A!! Congratulations!

March, 2017: Ben has won the DOE SCGSR award! Congratulations! This award will enable Ben to spend the summer of 2017 at the Oak Ridge National Laboratory to perform advanced ultrafast optical measurements. Exciting things to come.

March, 2017: Prof. Choi gave an invited talk at the Department of Chemical Engineering, University of New Mexico.


November, 2016: Ben's paper titled "
Controlling Nucleation, Growth, and Orientation of Metal Halide Perovskite Thin Films with Rationally Selected Additives" has been featured in an inside front cover!!
May, 2017: Our undergraduate researchers Jen and Justin graduated. Congratulations!
The group celebrated at Mellow Mushroom
June, 2017: Choi group had ~1 week long beamtime at CHESS. It was a very productive run. Papers to come! Also, Prof. Choi gave an invited talk at the CHESS Users' Meeting 2017.
June, 2017: Our postdoc Dr. J. Scott Niezgoda will be an Assistant Professor in the Dept. of Chemistry, St. Joseph's University! Congratulations! It was fantastic to have him in our group and we wish him the best. The group celebrated at the World of Beer.
July, 2017: In collaboration with Gupta group, Xiaoyu and George's paper titled "Room-Temperature Processing of TiOx Electron Transporting Layer for Perovskite Solar Cells" has been accepted for publication in the Journal of Physical Chemistry Letters!! Congratulations!

July, 2017: In collaboration with Lee group, our paper titled "
Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites" has been accepted for publication in Proceedings of the National Academy of Sciences!!