Laser Terahertz Emission Microscope for Imaging Grain Heterogeneity: A Case Study of CH3NH3PbI3 Perovskite Semiconductors

Journal Article · Mon Oct 17 00:00:00 EDT 2022 · Crystals

DOI:https://doi.org/10.3390/cryst12101462· OSTI ID:1893228

Liu, Zhaoyu ; Luo, Liang ; Park, Joongmok; Kim, Richard H. J. ; Song, Zhaoning ; Turan, Deniz; Jarrahi, Mona; Yan, Yanfa; Wang, Jigang

Strong terahertz (THz) emission from the methylammonium lead iodide (MAPbI₃) perovskite semiconductors has been observed following above-bandgap photoexcitation, yet local THz responses of crystalline microstructures are absent. We implement laser THz emission microscope (LTEM), yet-to-be applied to the perovskite semiconductors, as a novel and complementary tool to evaluate the electronic and grain heterogeneity of MAPbI₃ thin films. Two MAPbI₃ samples with different grain sizes are studied. Using this approach, we show that the one with a larger grain size gives more uniform THz radiation. More significant spatial THz intensity fluctuation is observed for the sample with a smaller grain size.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States); Univ. of California, Los Angeles, CA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
• Grant/Contract Number: AC02-07CH11358; SC0016925; 1611454; DMR 1400432
• OSTI ID: 1893228
• Alternate ID(s): OSTI ID: 1895101; OSTI ID: 2001451
• Report Number(s): IS-J-10,917; CRYSBC; PII: cryst12101462
• Journal Information: Crystals, Journal Name: Crystals Vol. 12 Journal Issue: 10; ISSN 2073-4352
• Publisher: MDPI AG
• Country of Publication: Germany
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
laser terahertz emission microscope
perovskite
terahertz imaging
36 MATERIALS SCIENCE