Excitons in ultrathin organic-inorganic perovskite crystals

被引:283
作者
Yaffe, Omer [1 ,2 ]
Chernikov, Alexey [1 ,2 ]
Norman, Zachariah M. [3 ]
Zhong, Yu [3 ]
Velauthapillai, Ajanthkrishna [1 ,2 ]
van der Zande, Arend [1 ,2 ]
Owen, Jonathan S. [3 ]
Heinz, Tony F. [4 ,5 ]
机构
[1] Columbia Univ, Dept Phys, New York, NY 10027 USA
[2] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA
[3] Columbia Univ, Dept Chem, New York, NY 10027 USA
[4] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[5] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
关键词
SOLAR-CELLS; SEMICONDUCTOR; SPECTROSCOPY; CONFINEMENT; TRANSITIONS; COMPOUND; STATE;
D O I
10.1103/PhysRevB.92.045414
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We demonstrate the formation of large sheets of layered organic-inorganic perovskite (OIPC) crystals, as thin as a single unit cell, prepared by mechanical exfoliation. The resulting two-dimensional OIPC nanosheets of 2.4 nm thickness are direct semiconductors with an optical band gap of 2.4 eV. They exhibit unusually strong light-matter interaction with an optical absorption as high as 25% at the main excitonic resonance, as well as bright photoluminescence. We extract an exciton binding energy of 490 meV from measurement of the series of excited exciton states. The properties of the excitons are shown to be strongly influenced by the changes in the dielectric surroundings. The environmental sensitivity of these ultrathin OIPC sheets is further reflected in the strong suppression of a thermally driven phase transition present in the bulk crystals.
引用
收藏
页数:7
相关论文
共 60 条
[1]  
[Anonymous], PROGR INORGANIC CHEM
[2]   Analytical approach to excitonic properties of MoS2 [J].
Berghaeuser, Gunnar ;
Malic, Ermin .
PHYSICAL REVIEW B, 2014, 89 (12)
[3]   Theory of neutral and charged excitons in monolayer transition metal dichalcogenides [J].
Berkelbach, Timothy C. ;
Hybertsen, Mark S. ;
Reichman, David R. .
PHYSICAL REVIEW B, 2013, 88 (04)
[4]   Making graphene visible [J].
Blake, P. ;
Hill, E. W. ;
Castro Neto, A. H. ;
Novoselov, K. S. ;
Jiang, D. ;
Yang, R. ;
Booth, T. J. ;
Geim, A. K. .
APPLIED PHYSICS LETTERS, 2007, 91 (06)
[5]   Sequential deposition as a route to high-performance perovskite-sensitized solar cells [J].
Burschka, Julian ;
Pellet, Norman ;
Moon, Soo-Jin ;
Humphry-Baker, Robin ;
Gao, Peng ;
Nazeeruddin, Mohammad K. ;
Graetzel, Michael .
NATURE, 2013, 499 (7458) :316-+
[6]   Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene [J].
Butler, Sheneve Z. ;
Hollen, Shawna M. ;
Cao, Linyou ;
Cui, Yi ;
Gupta, Jay A. ;
Gutierrez, Humberto R. ;
Heinz, Tony F. ;
Hong, Seung Sae ;
Huang, Jiaxing ;
Ismach, Ariel F. ;
Johnston-Halperin, Ezekiel ;
Kuno, Masaru ;
Plashnitsa, Vladimir V. ;
Robinson, Richard D. ;
Ruoff, Rodney S. ;
Salahuddin, Sayeef ;
Shan, Jie ;
Shi, Li ;
Spencer, Michael G. ;
Terrones, Mauricio ;
Windl, Wolfgang ;
Goldberger, Joshua E. .
ACS NANO, 2013, 7 (04) :2898-2926
[7]   Quasiparticle band structure calculation of monolayer, bilayer, and bulk MoS2 [J].
Cheiwchanchamnangij, Tawinan ;
Lambrecht, Walter R. L. .
PHYSICAL REVIEW B, 2012, 85 (20)
[8]   Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2 [J].
Chernikov, Alexey ;
Berkelbach, Timothy C. ;
Hill, Heather M. ;
Rigosi, Albert ;
Li, Yilei ;
Aslan, Ozgur Burak ;
Reichman, David R. ;
Hybertsen, Mark S. ;
Heinz, Tony F. .
PHYSICAL REVIEW LETTERS, 2014, 113 (07)
[9]   Dielectric screening in two-dimensional insulators: Implications for excitonic and impurity states in graphane [J].
Cudazzo, Pierluigi ;
Tokatly, Ilya V. ;
Rubio, Angel .
PHYSICAL REVIEW B, 2011, 84 (08)
[10]   Electron-Hole Interaction in Carbon Nanotubes: Novel Screening and Exciton Excitation Spectra [J].
Deslippe, Jack ;
Dipoppa, Mario ;
Prendergast, David ;
Moutinho, Marcus V. O. ;
Capaz, Rodrigo B. ;
Louie, Steven G. .
NANO LETTERS, 2009, 9 (04) :1330-1334