Direct observation of mode-specific phonon-band gap coupling in methylammonium lead halide perovskites

被引：73

作者：

Kim, Heejae ^{[1
]}

Hunger, Johannes ^{[1
]}

Canovas, Enrique ^{[1
]}

Karakus, Melike ^{[1
]}

Mics, Zoltan ^{[1
]}

Grechko, Maksim ^{[1
]}

Turchinovich, Dmitry ^{[1
]}

Parekh, Sapun H. ^{[1
]}

Bonn, Mischa ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, Dept Mol Spect, Ackermannweg 10, D-55128 Mainz, Germany

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

关键词：

CHARGE-CARRIER DYNAMICS; SOLAR-CELLS; TEMPERATURE-DEPENDENCE; TRIHALIDE PEROVSKITES; HYBRID PEROVSKITES; HIGH-PERFORMANCE; SPECTROSCOPY; SEMICONDUCTORS; INTERPLAY; CH(3)NH(3)PBL(3);

D O I：

10.1038/s41467-017-00807-x

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Methylammonium lead iodide perovskite is an outstanding semiconductor for photovoltaics. One of its intriguing peculiarities is that the band gap of this perovskite increases with increasing lattice temperature. Despite the presence of various thermally accessible phonon modes in this soft material, the understanding of how precisely these phonons affect macroscopic material properties and lead to the peculiar temperature dependence of the band gap has remained elusive. Here, we report a strong coupling of a single phonon mode at the frequency of similar to 1 THz to the optical band gap by monitoring the transient band edge absorption after ultrafast resonant THz phonon excitation. Excitation of the 1 THz phonon causes a blue shift of the band gap over the temperature range of 185 similar to 300 K. Our results uncover the mode-specific coupling between one phonon and the optical properties, which contributes to the temperature dependence of the gap in the tetragonal phase.

引用

页数：9

共 50 条

[1] Cation-Induced Band-Gap Tuning in Organohalide Perovskites: Interplay of Spin-Orbit Coupling and Octahedra Tilting [J].

Amat, Anna ;

Mosconi, Edoardo ;

Ronca, Enrico ;

Quarti, Claudio ;

Umari, Paolo ;

Nazeeruddin, Md. K. ;

Graetzel, Michael ;

De Angelis, Filippo .

NANO LETTERS, 2014, 14 (06) :3608-3616

[2]

[Anonymous], 1999, PRINCIPLES NONLINEAR

[3] BAND NONPARABOLICITIES, BROADENING, AND INTERNAL FIELD DISTRIBUTIONS - SPECTROSCOPY OF FRANZ-KELDYSH OSCILLATIONS [J].

ASPNES, DE .

PHYSICAL REVIEW B, 1974, 10 (10) :4228-4238

[4] 3RD-ORDER OPTICAL NONLINEARITIES IN SEMICONDUCTORS - THE 2-BAND MODEL [J].

AVERSA, C ;

SIPE, JE ;

SHEIKBAHAE, M ;

VANSTRYLAND, EW .

PHYSICAL REVIEW B, 1994, 50 (24) :18073-18082

[5] Synthesis and crystal chemistry of the hybrid perovskite (CH3NH3) PbI3 for solid-state sensitised solar cell applications [J].

Baikie, Tom ;

Fang, Yanan ;

Kadro, Jeannette M. ;

Schreyer, Martin ;

Wei, Fengxia ;

Mhaisalkar, Subodh G. ;

Graetzel, Michael ;

White, Tim J. .

JOURNAL OF MATERIALS CHEMISTRY A, 2013, 1 (18) :5628-5641

[6] Low-temperature processed meso-superstructured to thin-film perovskite solar cells [J].

Ball, James M. ;

Lee, Michael M. ;

Hey, Andrew ;

Snaith, Henry J. .

ENERGY & ENVIRONMENTAL SCIENCE, 2013, 6 (06) :1739-1743

[7]

Boyd RW, 2008, NONLINEAR OPTICS, 3RD EDITION, P1

[8]

Brenner TM, 2016, NAT REV MATER, V1, DOI 10.1038/natrevmats.2015.7

[9] Lattice dynamics and vibrational spectra of the orthorhombic, tetragonal, and cubic phases of methylammonium lead iodide [J].

Brivio, Federico ;

Frost, Jarvist M. ;

Skelton, Jonathan M. ;

Jackson, Adam J. ;

Weber, Oliver J. ;

Weller, Mark T. ;

Goni, Alejandro R. ;

Leguy, Aurelien M. A. ;

Barnes, Piers R. F. ;

Walsh, Aron .

PHYSICAL REVIEW B, 2015, 92 (14)

[10] Relativistic quasiparticle self-consistent electronic structure of hybrid halide perovskite photovoltaic absorbers [J].

Brivio, Federico ;

Butler, Keith T. ;

Walsh, Aron ;

van Schilfgaarde, Mark .

PHYSICAL REVIEW B, 2014, 89 (15)

← 1 2 3 4 5 →