Photosensitive polymer thin-film FETs based on poly(3-octylthiophene)

被引:39
作者
Deen, MJ [1 ]
Kazemeini, MH [1 ]
机构
[1] McMaster Univ, Dept Elect & Comp Engn, Hamilton, ON L8S 4K1, Canada
关键词
conjugated polymer transistors; contact resistance; photodetector; phototransistor; poly(3-octylthiophene) (P3OT) phototransistor; poly(3-octylthiophene) (P3OT) transistor; polymer FET; polymer thin-film transistor (TFT); space-charge limited conduction; trap-limited conduction;
D O I
10.1109/JPROC.2005.850300
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The effects of white light on the electrical performance of polymer thin-film transistors (PTFTs) based on regioregular poly(3-octylthiophene) (P3OT) are investigated. Upon illumination, a significant increase in the PFET's drain current is observed with a maximum photosensitivity of 104 in the subthreshold operation and a broad-band responsivity with a maximum value of 160 mA/W at irradiance of 1.7 mW/cm(2) and at low gate biases. The photosensitivity decreases with the increase in the absolute gate bias. The simultaneous control of the device with both the gate voltage and illumi- nation is possible at low irradiances of < 0.7m mW/cm(2). It is found that the illumination effectively decreases the threshold voltage of the device, but it does not change the field-effect mobility. Using a trap model, it is shown that the narrow layers close to the drain and source contacts with high concentratiops of defects are two possible regions for photogeneration of excitons and separation of charges. Using the theory of space-charge limited conduction, the extracted band mobility for P3OT is 0.08 cm(2)/V. S, while a mobility of 8 x 10(-5) cm(2) / V(.)s is found for the regions next to the source and drain contacts. The PTFT's high photosensitivity at zero gate voltage suggests a simple design of low-voltage, high-sensitivily rwo-terminal photodetectors for applications in large-area flexible optoelectronis.
引用
收藏
页码:1312 / 1320
页数:9
相关论文
共 35 条
[21]   Low-frequency noise in polymer thin-film transistors [J].
Marinov, O ;
Deen, MJ ;
Yu, J ;
Vamvounis, G ;
Holdcroft, S ;
Woods, W .
IEE PROCEEDINGS-CIRCUITS DEVICES AND SYSTEMS, 2004, 151 (05) :466-472
[22]   Variable current transport in polymer thin film transistors [J].
Marinov, O ;
Deen, MJ ;
Yu, JF ;
Vamvounis, G ;
Holdcroft, S ;
Woods, W .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 2004, 22 (03) :755-759
[23]  
MARINOV O, IN PRESS IEE P CIRCU
[24]   Light responsive polymer field-effect transistor [J].
Narayan, KS ;
Kumar, N .
APPLIED PHYSICS LETTERS, 2001, 79 (12) :1891-1893
[25]   FIELD-EFFECT CONDUCTION IN POLYALKYLTHIOPHENES [J].
PALOHEIMO, J ;
STUBB, H ;
YLILAHTI, P ;
KUIVALAINEN, P .
SYNTHETIC METALS, 1991, 41 (1-2) :563-566
[26]   Electrical characteristics of poly (3-hexylthiophene) thin film transistors printed and spin-coated on plastic substrates [J].
Park, SK ;
Kim, YH ;
Han, JI ;
Moon, DG ;
Kim, WK ;
Kwak, MG .
SYNTHETIC METALS, 2003, 139 (02) :377-384
[27]   Subthreshold characteristics of field effect transistors based on poly(3-dodecylthiophene) and an organic insulator [J].
Scheinert, S ;
Paasch, G ;
Schrödner, M ;
Roth, HK ;
Sensfuss, S ;
Doll, T .
JOURNAL OF APPLIED PHYSICS, 2002, 92 (01) :330-337
[28]   Integrated optoelectronic devices based on conjugated polymers [J].
Sirringhaus, H ;
Tessler, N ;
Friend, RH .
SCIENCE, 1998, 280 (5370) :1741-1744
[29]   Microstructure-mobility correlation in self-organised, conjugated polymer field-effect transistors [J].
Sirringhaus, H ;
Brown, PJ ;
Friend, RH ;
Nielsen, MM ;
Bechgaard, K ;
Langeveld-Voss, BMW ;
Spiering, AJH ;
Janssen, RAJ ;
Meijer, EW .
SYNTHETIC METALS, 2000, 111 :129-132
[30]   Hole transport in polycrystalline pentacene transistors [J].
Street, RA ;
Knipp, D ;
Völkel, AR .
APPLIED PHYSICS LETTERS, 2002, 80 (09) :1658-1660