Search or add a thesis

Advanced Search (Beta)
Home > Organic Dye Based Opto-Electronic Devices and Sensors

Organic Dye Based Opto-Electronic Devices and Sensors

Thesis Info

Access Option

External Link

Author

Fatima, Noshin

Program

PhD

Institute

Capital University of Science & Technology

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Microelectronics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12915/1/Noshin_Fatima_Integrated_Circuits_%26_Devices_HSR_2018_CUST_29.08.2018.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726827183

Similar


Organic semiconductors have been the subject of intense scientific investigation for the past 50 years. Applications of these materials include chemical, physical and biological sensors, electronic, and photonic devices. Low cost production of these devices is possible by using thermal evaporation, centrifugation, spin coating and drop casting technologies. This thesis describes fabrication and characterization of organic semiconductor sensors for temperature, humidity and light measurements using novel organic materials. Different types of commercially available organic dyes have been used as active materials to fabricate sensors. In the first part of the thesis, humidity sensors have been fabricated using CuPc/NiPc thin films deposited by drop casting and centrifugation. Another type of humidity sensor based on VOPcPhO, Alq3 and their composites have also been fabricated by spin coating technique, wherein organic films have been grown over a substrate having pre-fabricated aluminum electrodes. Optimum ratio of VOPcPhO and Alq3 has been identified to achieve best capacitive and resistive response of the sensor. In the second part, optical sensors from composite films of NiPc:CoPc (1:1) have been fabricated by drop casting and centrifugation on a ceramic alumina substrate having surface-type interdigitated Ag electrodes. Variation in impedance and capacitance w.r.t. illumination have been measured. Another type of optical sensors based on organic photodiodes (OPDs), using composite ZnPc:PC71BM dye, have been fabricated and characterized. The optimum ratio of ZnPc:PC71BM (1:0.8) has been determined by detecting photocurrent density with respect to varied illumination levels of impinging light at different reverse biased conditions of the optical sensors. Moreover, the light to dark current density ratio (Jph/Jd) of the devices has been evaluated along with the transient photo-current density response to assess their sensitivity. In the third part, organic field effect transistors (OFETs) functioning as temperature/humidity senors (referred to as multi-functional sensors) have been fabricated xi using orange dye (OD) and its composite OD:sugar at positive (+1 g) and negative (-1 g) gravities by drop casting. It has been observed that in drop casting method, properties of OFET sensors are dependent upon gravity as well as solution composition employed for OFETs channel definition. Additionally, OFETs have been fabricated by depositing NiPc of varying thickness (100-300 nm) and semi-transparent thin films of aluminum in sequence by vacuum evaporation on a glass substrate having silver source and drain electrodes. It has been observed that the drain current of OFETs increases with increase in radiation intensity, and the OFETs having 200 nm thick NiPc film, exhibited better performance compared to 100 nm and 300 nm thick films. For temperature evaluation, it has been noticed that the reduction in the impedance is higher when thickness of the film is decreased. It has also been demonstrated that for improved performance, as a temperature sensor, the OFET channel film should be ∼100 nm.
Loading...

Similar Thesis

Showing 1 to 20 of 100 entries
TitleAuthorSupervisorDegreeInstitute
PhD
Capital University of Science & Technology, Islamabad, Pakistan
PhD
University of the Punjab, Lahore, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
RPH
COMSATS University Islamabad, Islamabad, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Swabi, Pakistan
PhD
University of Peshawar, Peshawar, Pakistan
Mphil
Quaid-i-Azam University, Islamabad, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Swabi, Pakistan
PhD
Government College University, Lahore, Pakistan
University of Engineering and Technology, Rawalpindi, Pakistan
PhD
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan
PhD
Hazara University, Mansehra, Pakistan
MS
University of Management and Technology, Lahore, Pakistan
PPH
COMSATS University Islamabad, Islamabad, Pakistan
PhD
COMSATS University Islamabad, Islamabad, Pakistan
BS
International Islamic University, Islamabad, Pakistan
TitleAuthorSupervisorDegreeInstitute
Showing 1 to 20 of 100 entries

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...