Conducting polymers as electron glasses: surface charge domains and slow relaxation

被引:11
作者
Ortuno, Miguel [1 ]
Escasain, Elisa [1 ]
Lopez-Elvira, Elena [2 ]
Somoza, Andres M. [1 ]
Colchero, Jaime [1 ]
Palacios-Lidon, Elisa [1 ]
机构
[1] Univ Murcia, Dept Fis CIOyN, E-30100 Murcia, Spain
[2] CSIC, Dept Surfaces & Coatings, Inst Ciencia Mat Madrid, Campus Cantoblanco, E-28049 Madrid, Spain
来源
SCIENTIFIC REPORTS | 2016年 / 6卷
关键词
THIN-FILMS; PERSISTENT PHOTOCONDUCTIVITY; CONJUGATED POLYMERS; MORPHOLOGY; DYNAMICS;
D O I
10.1038/srep21647
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
The surface potential of conducting polymers has been studied with scanning Kelvin probe microscopy. The results show that this technique can become an excellent tool to really 'see' interesting surface charge interaction effects at the nanoscale. The electron glass model, which assumes that charges are localized by the disorder and that interactions between them are relevant, is employed to understand the complex behavior of conducting polymers. At equilibrium, we find surface potential domains with a typical lateral size of 50 nm, basically uncorrelated with the topography and strongly fluctuating in time. These fluctuations are about three times larger than thermal energy. The charge dynamics is characterized by an exponentially broad time distribution. When the conducting polymers are excited with light the surface potential relaxes logarithmically with time, as usually observed in electron glasses. In addition, the relaxation for different illumination times can be scaled within the full aging model.
引用
收藏
页数:10
相关论文
共 48 条
[1]  
Amir A., 2015, P NAT ACAD SCI, V109, P1850
[2]   The Mosaic of Surface Charge in Contact Electrification [J].
Baytekin, H. T. ;
Patashinski, A. Z. ;
Branicki, M. ;
Baytekin, B. ;
Soh, S. ;
Grzybowski, B. A. .
SCIENCE, 2011, 333 (6040) :308-312
[3]   Thermal frequency noise in dynamic scanning force microscopy [J].
Colchero, J. ;
Cuenca, M. ;
Gonzalez Martinez, J. F. ;
Abad, J. ;
Perez Garcia, B. ;
Palacios-Lidon, E. ;
Abellan, J. .
JOURNAL OF APPLIED PHYSICS, 2011, 109 (02)
[4]   Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium [J].
Delahaye, J. ;
Grenet, T. ;
Gay, F. .
EUROPEAN PHYSICAL JOURNAL B, 2008, 65 (01) :5-19
[5]   Slow Conductance Relaxation in Insulating Granular Al: Evidence for Screening Effects [J].
Delahaye, J. ;
Honore, J. ;
Grenet, T. .
PHYSICAL REVIEW LETTERS, 2011, 106 (18)
[6]  
Dou LT, 2012, NAT PHOTONICS, V6, P180, DOI [10.1038/NPHOTON.2011.356, 10.1038/nphoton.2011.356]
[7]   Nonexponential relaxation of photoinduced conductance in organic field effect transistors [J].
Dutta, S ;
Narayan, KS .
PHYSICAL REVIEW B, 2003, 68 (12)
[8]   Excited state dynamics of a conformationally disordered conjugated polymer: A comparison of solutions and film [J].
Dykstra, TE ;
Kovalevskij, V ;
Yang, XJ ;
Scholes, GD .
CHEMICAL PHYSICS, 2005, 318 (1-2) :21-32
[9]   COULOMB GAP AND LOW-TEMPERATURE CONDUCTIVITY OF DISORDERED SYSTEMS [J].
EFROS, AL ;
SHKLOVSKII, BI .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1975, 8 (04) :L49-L51
[10]   Nanoscale surface photovoltage of organic semiconductors with two pass Kelvin probe microscopy [J].
Escasain, E. ;
Lopez-Elvira, E. ;
Baro, A. M. ;
Colchero, J. ;
Palacios-Lidon, E. .
NANOTECHNOLOGY, 2011, 22 (37)