Subcategory: Materials Science
Room: Exhibit Hall A
Washat Ware - Fayetteville State University
Co-Author(s): Bhoj Gauta, Fayetteville State University, Fayetteville, NC; Antony Devita, Fayetteville State University, Fayetteville, NC
The solution-processable, earth-abundant organometallic perovskites are promising materials for photovoltaic applications, offering tunable electronic levels, excellent charge transport and simplicity of thin-film device fabrication. Two dimensional (2D) perovskites have emerged as promising candidates over three-dimensional (3D) due to their interesting optical and electrical properties. In this work, photophysics of the 2D Perovskite (MA)2Pb(SCN)2I2 using steady state and time resolved absorption and emission spectroscopy. Photoluminescence lifetime of this 2D perovskite is 21 ns, compared to 7.0 ns of 3D counterpart indicating less defect traps in the former one. Also, using ultrafast pump probe spectroscopy, we studied the charge carrier dynamics. Carrier dynamics monitored at ~2.3 eV indicates that charges are depopulated with characteristics time constants of 3.5 ps and 57 ps. This indicates that the charge carrier recombination is finished within 100 ps. This work provides an improved understanding of fundamental photophysical processes in perovskite structures and provides the guideline for the design, synthesis and fabrication of optoelectronic devices including solar cells.
Funder Acknowledgement(s): This work was supported by NSF PREM program DMR 1827731.
Faculty Advisor: Bhoj Gautam, firstname.lastname@example.org
Role: I did sample preparation, data collection, and analysis.