| Full text | |
| Author(s): Show less - |
Wang, Jian
[1, 2]
;
Motaharifar, Elaheh
[3]
;
Murthy, Lakshmi N. S.
[1]
;
Higgins, Marissa
[1]
;
Barrera, Diego
[1]
;
Daunis, Trey B.
[1]
;
Zheng, Yangzi
[3]
;
Malko, Anton V.
[3]
;
Ely, Fernando
[1, 4]
;
Quevedo-Lopez, Manuel
[1]
;
Lee, Mark
[3]
;
Hsu, Julia W. P.
[1]
Total Authors: 12
|
| Affiliation: | [1] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 - USA
[2] Univ Washington, Dept Chem, Seattle, WA 98195 - USA
[3] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 - USA
[4] CTI Renato Archer, IC Packaging Lab, Campinas, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of Applied Physics; v. 125, n. 2 JAN 14 2019. |
| Web of Science Citations: | 2 |
| Abstract | |
Hybrid organic-inorganic lead halide perovskite materials show great promise in a number of optoelectronic applications, including solar cells, light emitting diodes, and photodetectors. Understanding their intrinsic material properties is critical to enhancing device performance and enabling innovative material and device designs. Here, we study lattice dynamics using far infrared (FIR) reflectance and photogenerated carrier dynamics using surface photovoltage (SPV) measurements on high-quality methylammonium lead bromide (MAPbBr(3)) single crystals. FIR reflectance shows three coherent infrared-active phonon modes between 40 and 200 cm(-1) that result in reststrahlen bands with much higher peak reflectance than has been previously reported. The phonon mode strength and damping are comparable to classical oxide perovskite single crystals. However, the effects of defects on photogenerated carrier recombination are still evident in SPV measurements. By performing SPV over different spectral ranges, we are able to separate the effects of surface and bulk defects on the recombination dynamics of photo generated charge carriers. We further apply SPV measurements to obtain the minority carrier (electron) diffusion length for the MAPbBr3 crystal. This study demonstrates that both FIR reflectance and SPV measurements provide useful information on the electromagnetic response properties of halide perovskite single crystals. Published under license by AIP Publishing. (AU) | |
| FAPESP's process: | 15/14183-5 - Neutron detection system based on nanoparticle composites |
| Grantee: | Fernando Ely |
| Support Opportunities: | Scholarships abroad - Research |