Solvent-free synthesis of organometallic halides CH3NH3PbI3 and (CH3NH3)3Bi2I9 and their thermoelectric transport properties
Abstract
Organometallic halides are great candidates for optoelectronics. As an important family of semiconductors, understanding their thermoelectric transport properties is also important. This has been a challenging task as many of such compounds are highly intrinsic. In this work, we synthesized two halides, CH3NH3PbI3 and (CH3NH3)3Bi2I9, using a solvent-free method. We found an extraordinarily high Seebeck coefficient of +2600 ± 200 μV/K in (CH3NH3)3Bi2I9. For CH3NH3PbI3, our synthesis method led to a negative Seebeck coefficient of –1350 ± 50 μV/K, in contrast to positive values observed in solvent synthesized samples. We also found the thermal conductivity of CH3NH3PbI3 to be 0.38 W/m K, largely independent of temperature from 300 K to 450 K, despite a tetragonal-to-cubic phase transition. (CH3NH3)3Bi2I9 has an even lower thermal conductivity of 0.21 W/m K (also temperature independent) which is due to its soft phonon dispersion and weak bonds.
- Authors:
-
- Illinois Inst. of Technology, Chicago, IL (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). The Molecular Foundry
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1567169
- Alternate Identifier(s):
- OSTI ID: 1557028
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 115; Journal Issue: 7; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Long, Xiang, Pan, Zhenyu, Zhang, Zhuolei, Urban, Jeffrey J., and Wang, Heng. Solvent-free synthesis of organometallic halides CH3NH3PbI3 and (CH3NH3)3Bi2I9 and their thermoelectric transport properties. United States: N. p., 2019.
Web. doi:10.1063/1.5113535.
Long, Xiang, Pan, Zhenyu, Zhang, Zhuolei, Urban, Jeffrey J., & Wang, Heng. Solvent-free synthesis of organometallic halides CH3NH3PbI3 and (CH3NH3)3Bi2I9 and their thermoelectric transport properties. United States. https://doi.org/10.1063/1.5113535
Long, Xiang, Pan, Zhenyu, Zhang, Zhuolei, Urban, Jeffrey J., and Wang, Heng. 2019.
"Solvent-free synthesis of organometallic halides CH3NH3PbI3 and (CH3NH3)3Bi2I9 and their thermoelectric transport properties". United States. https://doi.org/10.1063/1.5113535. https://www.osti.gov/servlets/purl/1567169.
@article{osti_1567169,
title = {Solvent-free synthesis of organometallic halides CH3NH3PbI3 and (CH3NH3)3Bi2I9 and their thermoelectric transport properties},
author = {Long, Xiang and Pan, Zhenyu and Zhang, Zhuolei and Urban, Jeffrey J. and Wang, Heng},
abstractNote = {Organometallic halides are great candidates for optoelectronics. As an important family of semiconductors, understanding their thermoelectric transport properties is also important. This has been a challenging task as many of such compounds are highly intrinsic. In this work, we synthesized two halides, CH3NH3PbI3 and (CH3NH3)3Bi2I9, using a solvent-free method. We found an extraordinarily high Seebeck coefficient of +2600 ± 200 μV/K in (CH3NH3)3Bi2I9. For CH3NH3PbI3, our synthesis method led to a negative Seebeck coefficient of –1350 ± 50 μV/K, in contrast to positive values observed in solvent synthesized samples. We also found the thermal conductivity of CH3NH3PbI3 to be 0.38 W/m K, largely independent of temperature from 300 K to 450 K, despite a tetragonal-to-cubic phase transition. (CH3NH3)3Bi2I9 has an even lower thermal conductivity of 0.21 W/m K (also temperature independent) which is due to its soft phonon dispersion and weak bonds.},
doi = {10.1063/1.5113535},
url = {https://www.osti.gov/biblio/1567169},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 7,
volume = 115,
place = {United States},
year = {Tue Aug 13 00:00:00 EDT 2019},
month = {Tue Aug 13 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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