High-Resolution ac Measurements of the Hall Effect in Organic Field-Effect Transistors

被引:55
作者
Chen, Y. [1 ,3 ]
Yi, H. T. [1 ]
Podzorov, V. [1 ,2 ]
机构
[1] Rutgers State Univ, Dept Phys, Piscataway, NJ 08854 USA
[2] Rutgers State Univ, IAMDN, Piscataway, NJ 08854 USA
[3] South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
来源
PHYSICAL REVIEW APPLIED | 2016年 / 5卷 / 03期
基金
美国国家科学基金会;
关键词
CHARGE-TRANSPORT; CRYSTAL; SEMICONDUCTORS;
D O I
10.1103/PhysRevApplied.5.034008
中图分类号
O59 [应用物理学];
学科分类号
摘要
We describe a high resolving power technique for Hall-effect measurements, efficient in determining Hall mobility and carrier density in organic field-effect transistors and other low-mobility systems. We utilize a small low-frequency ac magnetic field (B-rms < 0.25 T) and a phase-sensitive (lock-in) detection of Hall voltage, with the necessary corrections for Faraday induction. This method significantly enhances the signal-to-noise ratio and eliminates the necessity of using high magnetic fields in Hall-effect studies. With the help of this method, we are able to obtain the Hall mobility and carrier density in organic transistors with a mobility as low as mu similar to 0.3 cm(2) V-1 s(-1) by using a compact desktop apparatus and low magnetic fields. We find a good agreement between Hall-effect and electric-field-effect measurements, indicating that, contrary to the common belief, certain organic semiconductors with mobilities below 1 cm(2) V-1 s(-1) can still exhibit a fully developed, band-semiconductor-like Hall effect, with the Hall mobility and carrier density matching those obtained in longitudinal transistor measurements. This suggests that, even when mu < 1 cm(2) V-1 s(-1), charges in organic semiconductors can still behave as delocalized coherent carriers. This technique paves the way to ubiquitous Hall-effect studies in a wide range of low-mobility materials and devices, where it is typically very difficult to resolve the Hall effect even in very high dc magnetic fields.
引用
收藏
页数:9
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