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Internship Projects in 2011
Project 1:
Title: Fabrication of conductive traces by inkjet printing
Short Description/Objectives:
Fabricating printed structures in the microfabrication field is a topic of growing importance along the goal to cut fabrication costs and realize new functions. Especially printing metallic inks on polymer substrates is an important research direction for low cost electrical circuits on plastics for electronic devices interconnection, antennas,… That is why the Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh city (VNU-HCM) is developing a research program on fabricating such circuits by inkjet printing of silver based inks commercially available.
After a first phase where the trainee will learn the technology, he/she will realize deposition on PET films. The different process parameters will be studied: ink jetting parameters (temperature, voltage), substrate surface state, printing speed, in situ and ex situ annealing temperature. These deposited traces will be characterized morphologically as well as electrically by standard techniques (mechanical profilometer, AFM, 4 point resistance probing, electronic microscopy). The final goal of the training is to demonstrate an electrical circuit of printed circuit board type.
The interest for the trainee is to experiment on modern equipment a technology on the way to become a standard in fabricating printed electrical circuits beyond classical printed circuit boards.
Tutors: DANG Thi My Dung, Pr. Dr. Habil. DANG Mau Chien
Duration: 4 to 6 months
Contact Name: DANG Thi My Dung
E-mail address: dtmdung@vnuhcm.edu.vn
Phone: +84.908.99.48.63
Project 2:
Title: Development of an electrodeposition process
Short Description/Objectives:
The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh city (VNU-HCM) is developing a technology for RFID tag fabrication in the frame of its platform dedicated to this technology. The preferred way at the moment for prototyping needs is to deposit a copper thin film on a PET substrate, thereby realizing the antenna pattern and its connection to the RFID chip in the same process. This technology however requires an antenna with a thickness above 10 µm. The chosen process for doing this is electrodeposition of copper in acid bath. A bench already exists and first experiments were performed.
The present training aims at a complete study of the parameters of copper electrodeposition along 2 directions: on already processed antennas, on plane film prior to antenna patterning. After a first study of the experimental setup, the trainee will suggest a plan for experiments in order to explore the process and find the required process window (variation in current-voltage, bath composition study, additives). With the supervision of the tutor, the student will perform experiments in collaboration with the RFID team. He/she will study the obtained films using the standard physico-chemical techniques: 4 point prober, mechanical profilometer, AFM and SEM.
The trainee will acquire an important know-how in microfabrication, this electrodeposition technology being widely used in microelectronics and microsystems fabrication.
Tutors: TRAN Nhan Ai, Pr. Dr. Habil. DANG Mau Chien
Duration: 4 to 6 months
Contact Name: TRAN Nhan Ai
E-mail address: tnai@vnuhcm.edu.vn
Phone: +84.908.77.26.03
Project 3:
Title: High brightness electroluminescent diodes assessment
Short Description/Objectives:
Electroluminescent diodes are everywhere, in all modern electronic products. Since the 90’s development on blue diodes, the technology evolved towards its application to lighting. This evolution was allowed by the development of so called high brightness diodes with high emission yield. The Laboratory for Nanotechnology (LNT) of the Vietnam National University – Ho Chi Minh city (VNU-HCM) has been working on this technology for some years focusing on individual diodes.
The aim of this training is to reach a complete characterization of the performance of these high brightness diodes. The trainee will perform standard measurements of brightness as a function of current and voltage using the available equipments (integration sphere, spectrometer,…). He/she will suggest ideas for improved measurement benchs from ideas existing in the literature in order to study temperature increase effect while continuous or pulsed functioning, lifetime,…
This characterization oriented training will allow the student to get familiar with electroluminescent diodes, which is forecasted to be widely diffusing in lighting thanks to much higher performances than existing technologies.
Tutor: Pr. Dr. Habil. DANG Mau Chien
Duration: 4 to 6 months
Contact Name: DANG Mau Chien
E-mail address: dmchien@vnuhcm.edu.vn , dmchien@yahoo.com
Phone: +84.90.33.55.669
Project 4:
Title: Synthesis of amorphous silicon thin film by using PECVD process
Short Description/Objectives:
Solar energy becomes more and more important in large scale utility power plant since the availability of fossil energy sources decreases year after year. In order to fill the gap between the technical feasibility and the acceptance of the energy market, silicon solar cell thin film processing is well developed during the last two decades. The main aim of this technique is to decrease the price of solar panel for large area application. The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh city (VNU-HCM) is participating in this research activity with advanced multi chamber PECVD equipment and creating some research projects of thin silicon film process.
After obtaining the basic knowledge of cleanroom and technical processes, the trainee will working on the main cluster PECVD machine. Among a big number of adjustable parameters, the trainee has to find out a good combination so as to deposit excellent quality of thin amorphous intrinsic silicon thin film on normal glass. Several optical and electrical characterisations will be carried out by the trainee. The work can be extended to study the deposition process of very thin doped silicon layer on crystalline silicon surface.
The interest for the trainee is to work with very modern and complicated machine which requires much attention and patience not only for how to perform experiments but also for how to arrive to the good result through lowest number of attempts.
Tutors: PhD NGUYEN Tran Thuat
Duration: 4 to 6 months
Contact Name: NGUYEN Tran Thuat
E-mail address: ntthuat@vnuhcm.edu.vn
Phone: +84.122.868.3868
Project 5:
Title: Synthesis of thin ITO film for anti reflection and transparent conductive layer of solar cell by using sputtering process
Short Description/Objectives:
One main research activity of The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh city (VNU-HCM) is solar cell based on thin silicon film process. Since the conductivity of amorphous silicon is quite low, it is difficult to collect free charge carriers created from absorbed light. ITO is usually used to facilitate the later effect; this is the our aim to establish and to well control the sputtering process for depositing good ITO thin layer.
After obtaining the basic knowledge of cleanroom and technical processes, the trainee will working on the sputtering machine. One of the biggest obstacle of depositing ITO thin film is that ITO contain more than one metal oxide (indium oxide and tin oxide). The trainee must adjust the sputtering configuration in a experiment-oriented way in order to establish the good process for making ITO layer. The work can be carried out further by studying the optimization of the layer for the anti reflection top layer of solar cell application.
The interest for the trainee is that he has to demonstrate his ability to get rid of technical challenge. Another plus point is that the trainee will play an essential role in the process flow of making thin film silicon based solar cell.
Tutors: PhD NGUYEN Tran Thuat
Duration: 4 to 6 months
Contact Name: NGUYEN Tran Thuat
E-mail address: ntthuat@vnuhcm.edu.vn
Phone: +84.122.868.3868
Project 6:
Title: Metallization for solar cell by using screen printing process and other techniques
Short Description/Objectives:
The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh city (VNU-HCM) is performing several research project in the field of solar cell processing. Several ways for making the p-n junction are studying in order to optimize the process but metallisation step still plays a crucial role for obtaining good efficiency photovoltaic cell.
The design of front contact pattern was well studied; photolithography lift-off based metallisation process was carried out and good efficiency wafer based solar cell was obtained in our institution. In this internship, after obtaining general knowledge in cleanroom and technical processes, the trainee will be working mainly on the screen printer. The trainee has to establish the complete process from making screen with desired contact pattern to optimizing the front and back contact quality.
The interest for the trainee is to work on and to optimize a technical process that can be applied in industry due to its low cost and good ability for large scale manufacturing application.
Tutors: PhD NGUYEN Tran Thuat
Duration: 4 to 6 months
Contact Name: NGUYEN Tran Thuat
e-mail address: ntthuat@vnuhcm.edu.vn
Phone: +84.122.868.3868
Project 7:
Title: Solar simulator calibration
Short Description/Objectives:
The Laboratory for Nanotechnology (LNT) of the Vietnam National University, Ho Chi Minh City (VNU-HCM) is engaged in the development of photovoltaic cells, especially based on monocrystalline silicon. The characterization of these cells is by means of a device called the solar simulator. Xenon arc lamp of high power is used to simulate a standard light intensity (1 sun AM 1.5) to compare the results in the international level. The solar cell is arranged under the lamp and its electrical parameters (current, voltage, etc.) are measured under various lighting conditions.
The solar simulator has not been well recalibrated at the factory. But the validity of the measurement depends on the assurance that the calibration is good. The internship is to study the assembly of the simulator and to develop a simple calibration method which is reproducible and can be implemented as necessary. For this, the trainee will have all available documentation of the equipment and know-how already acquired by the solar cell group. It will benefit especially from the head coaching internship photovoltaic specialist to understand the need to define a calibration and validation.
This internship offer is specially aimed for students in electrical engineering program. The trainee will have the opportunity to learn about the photovoltaic technology whose importance for the energy mix becomes more and more evident, and of cause he/she will be working in the modern environment of LNT.
Tutor: PhD NGUYEN Tran Thuat
Duration: 4 to 6 months
Contact person: NGUYEN Tran Thuat
Phone: +84 985 516 980
Project 8: Automatisation d’une maquette de démonstration de la technologie RFID
La technologie RFID est devenue ces dernières années le maillon de base de tous les développements des technologies dites sans contact. Pratiquement parlant, une antenne connectée à une puce électronique sert de support d’information fixé à un objet sous forme d’étiquette. Un lecteur (fixe ou mobile) fournit énergie et requête à l’étiquette qui renvoie la réponse souhaitée telle que par exemple le code unique d’identification ou bien le montant restant sur une carte de paiement (Navigeo par exemple),… Le Laboratoire de Nanotechnologies (LNT) de l’Université Nationale du Vietnam à Ho Chi Minh Ville (VNU-HCM) développe les briques de base de cette technologie pour les applications au Vietnam, de la conception d’une étiquette à son test en environnement réel en passant par sa fabrication. Pour réaliser une démonstration grandeur nature de cette technologie souvent invisible pour l’utilisateur, le LNT travaille sur une maquette de parking de motos (véhicule le plus populaire au Vietnam).
L’objectif du stage est d’automatiser la maquette afin que lorsqu’une moto se présente devant la barrière du parking, le système effectue toutes les opérations de reconnaissance nécessaires et ouvre la barrière si l’entrée est autorisée. Pour cela, un lecteur RFID dispose d’un programme pour effectuer les opérations de communication avec l’étiquette placée sur la moto. Un autre automatisme gère la barrière. Le stage consistera à trouver les bons paramètres afin de relier ces 2 systèmes de façon transparente. Le logiciel à créer devra standardiser le format des données en provenance du lecteur RFID afin que celui-ci puisse être interchangé (il existe différents formats de lecteurs RFID présentant différents avantages qui sont en cours de test sur cette maquette). Ce stage fait appel à de la programmation relativement simple mais nécessite un travail de compréhension amont des contraintes de communication entre le lecteur et l’automatisme de la barrière.
L’environnement du LNT de niveau international couplé à un problème technologique d’actualité permettra au stagiaire d’appréhender cette technologie clé tout en découvrant les multiples dimensions de l’environnement vietnamien. C’est une expérience internationale riche.
Encadrants : Pr. Dr. DANG Mau Chien (francophone)
Durée : 3 mois
Project 9: Simulation d’étiquettes RFID
Dans le cadre de ses recherches sur la technologie RFID, le Laboratoire de Nanotechnologies (LNT) de l’Université Nationale du Vietnam à Ho Chi Minh Ville (VNU-HCM) a mis en place une plate-forme de conception-simulation d’étiquettes RFID. Ces objets composés d’une antenne planaire connectée à une puce électronique basse consommation peuvent être fixés sur des objets divers et interrogés à l’aide d’un lecteur RFID. Ces étiquettes doivent être les plus simples possibles pour être économiquement intéressantes. Dans ce contexte, l’adaptation d’impédance entre la puce et l’antenne ne peut reposer que sur la conception de cette dernière.
Afin de poursuivre la montée en puissance de cette plate-forme pour accompagner la fabrication des étiquettes (également réalisée au LNT), le stage proposé vise à caractériser le logiciel de simulation électromagnétique mis en œuvre au LNT. Les résultats de simulation fournis par ce logiciel commercial se sont révélés sensibles à divers paramètres (largeur de bande de l’impulsion d’entrée, finesse du maillage,…) qui limitent actuellement la finesse avec laquelle les étiquettes RFID peuvent être simulées. Le stage débutera par une prise en main de ce logiciel commercial à l’aide des travaux déjà réalisés au LNT. En se basant sur les travaux réalisés par le stagiaire précédent (2010), il sera ensuite possible de réaliser des expériences de simulation en variant les paramètres logiciels et d’étudier leur influence sur les résultats de simulation (position de la résonance, largeur de bande,…). Le résultat attendu est une meilleure compréhension du comportement du logiciel dans la simulation d’étiquettes RFID.
Le stagiaire apprendra l’utilisation d’un des principaux logiciels de simulation électromagnétique actuels. Cet apprentissage est une introduction très utile car la simulation électromagnétique a envahi la conception de tous les sytèmes sans fil, cartes électroniques et les nombreux produits correspondant. Tout cela dans un environnement de recherche moderne.
Encadrants : Dr. DNGUYEN Tran Thuat (francophone)
Durée : 3 mois
Project 10:
Title: Realizing education project for Light-Emitting Diode (LED) lamps
Short Description/Objectives:
The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh City (VNU-HCM) are planning several education projects to promote nanotechnology knowledge and applications in Vietnam. The purposes of these projects include:
- Raising public awareness of nanotechnology and applications in Vietnam.
- Sparking interest of young students in exploring the nano world.
- Training LNT’s students and workforce.
- Enhancing cooperation between LNT and industry & investors.
- Technology transfer.
The products of these educational projects are booklets, manuals, video clips,… of the fabrication and application of products of LNT. These projects evolve from making video clips to train LNT’s employees adopting the educational philosophy of Khan Academy ( www.khanacademy.org). This philosophy is teaching students by video clips in advance at home and using time in classroom for discussion and doing homework and experiments. From this, LNT would like to build an education program for people to learn about nanotechnology and applications. This particular project focuses on LED lamps. Trainee joining the project can participate in all aspects of making education materials. The tasks include performing experiments, making manuals for equipments and software of LNT, screenwriting, directing, filming, playing roles in video clips,… That means bringing everything about the science, fabrication and applications of LED lamps out to inspire public. The project is not limited to beginners of nanotechnology. It also tries to reach experts in science and engineering fields, to companies and investors for further cooperation.
Tutors: Dr.NGUYEN Giao Hoa, Pr. Dr. Habil. DANG Mau Chien
Duration: 3 to 4 months
Contact Name: Dr. NGUYEN Giao Hoa
E-mail address: nghoa@vnuhcm.edu.vn
Phone: +84 0908 255 027
Project 11:
Title: Realizing education project for Radio Frequency Identification (RFID) tags
Short Description/Objectives:
The Laboratory for Nanotechnology (LNT) of the Vietnam National University - Ho Chi Minh City (VNU-HCM) are planning several education projects to promote nanotechnology knowledge and applications in Vietnam. The purposes of these projects include:
- Raising public awareness of nanotechnology and applications in Vietnam.
- Sparking interest of young students in exploring the nano world.
- Training LNT’s students and workforce.
- Enhancing cooperation between LNT and industry & investors.
- Technology transfer.
The product of these educational projects are booklets, manuals, video clips,… of the fabrication and application of products of LNT. These projects evolve from making video clips to train LNT’s employees adopting the educational philosophy of Khan Academy ( www.khanacademy.org). This philosophy is teaching students by video clips in advance at home and using time in classroom for discussion and doing homework and experiments. From this, LNT would like to build an education program for people to learn about nanotechnology and applications. This particular project focuses on RFID tags. Trainee joining the project can participate in all aspects of making education materials. The tasks include performing experiments, making manuals for equipments and software of LNT, screenwriting, directing, filming, playing roles in video clips,… That means bringing everything about the science, fabrication and applications of RFID tags out to inspire public. The project is not limited to beginners of nanotechnology. It also tries to reach to experts in science and engineering fields, to companies and investors for further cooperation.
Tutors: Dr. NGUYEN Giao Hoa, Pr. Dr. Habil. DANG Mau Chien
Duration: 3 to 4 months
Contact Name: Dr. NGUYEN Giao Hoa
E-mail address: nghoa@vnuhcm.edu.vn
Phone: +84 0908 255 027
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028 37 2468 23 /32
