Welcome to your class home page!

Instructors can edit this page or give access to teaching assistants.

If you need help using this web site, please send an e-mail to webmaster@soe.ucsc.edu.


3/16 (Mon) We have finished all lectures, and the only assignment is the term paper due at 10 pm, 3/19 (Thu). If you have any questions, please send me an email. -TY

Regarding the term paper, you want to start from the EDL template uploaded below. In the real EDL, you cannot go beyond 3 pages (e.g., "2 pages" is fine so long as you say all you want). Here are some tips.

(1) Choose 3-5 figures. You may want to combine related figures such as Figs. 2(a), 2(b), and 2(c). Now Fig. 2 is counted as one.

(2) Then write figure captions and paragraphs.

(3) Don't forget references.

(4) Write the abstract at the end.

(5) In reality, you submit to a journal and then communicate with reviewers. In this ECE227 assignment, you don't have this process.


3/10 (Tue) NewsTomorrow it seems we can do oral at the usual locations. Please check the course web also. -TY writing at 6:15 pm on 3/10 (Tue)



Webcasting will continue through the last week of instruction


Michael Nardell

5:03 PM (1 hour ago)
We are sending an email to all faculty who are currently using the UCSC webcasting service. The UCSC webcasting service will continue to record your scheduled classes until the end of winter instruction on March 13, and we have received confirmation that webcasting classrooms will be unlocked during this period.  As you know, and per campus instructions,  the expectation is that students will not be present in the classroom.  You will be teaching to an empty classroom - please remember to use the wireless microphone in this situation. This is the current status of a fluid situation, things may change including potential future classroom access restrictions that may affect classroom access. 
If you have any questions related to webcasting please send an email to webcast@ucsc.edu
Michael Nardell

3/10 (Tue) Urgent: It seems the UCSC stops all lecture classes due to corona virus. I will seek for zoom. In the worst case, there is a possibility to drop oral presentation in case zoom doesn't work. In this case, I will evaluate your oral using (1) emailed revised slides and (2) I ask questions via email and you return me your answers. The oral using (3) zoom is contingent depending upon zoom set up being successful. Anyway, please submit revised slides to me by 2 pm tomorrow, 3/11 (Wed). The same due date for the term-paper on 3/19 (Thu), 10 pm.

Please wait for my announcements for zoom and oral schedule (presentation order, time duration, etc.). -TY

If you are new to zoom, please watch a youtube video, such as https://www.youtube.com/watch?v=sJq_OM5VcDY It may take some time depending on your past experiences. I will send an invitation later. -TY

3/9 (Mon) We stidied various new devices and materials. Class note 09 uploaded. -TY

3/5 (Thu) Hints for Midterm question 7. This is for an electron in the magnetic field. You want to show that the Hamiltonian is classically meaningful, or the force is surely consistent with the Lorents force in the magnetic field. In quantum, the standard replacement of a momentum with a differential operator works. You want to write down a Schrodinger equation after this replacement. Of course, you don't have to solve this equation, and up to here, that will be doable. -TY

3/4 (Wed) Class note posted. We have studied energy bands for various devices. -TY

3/2 (Mon) HW5sol and HW6 posted. -TY

2/28 (Fri) Midterm has been sent. Please check your email. -TY

2/28 (Fri) I am preparing Midterm questions now, and plan to distribute the Midterm in the late evening. I received an inquiry for the Final Project. The idea is to let you experience a research presentation cycle. You will present in a conference and then write a paper. In your real research, you will present your own data, but in this ECE227, this is replaced by reviewing an existing work. You can choose your own favorite topic in Semicond Phys. -TY

2/27 (Thu) Here are important days. HWs are due on every Monday as usual.

   2/28 (Fri) Midterm distribution via email

   3/2 (Mon) Abstract deadline 10 pm

   3/6 (Fri) Midterm deadline 10 pm

   3/9 (Mon) Slides deadline 10 pm

   3/11 (Wed) Oral presentation

   3/19 (Thu) Term paper deadline 10 pm

Abstract: You will report a reviewe presentation. In reality, you will pick up a few papers and report about them. I will give you a feedbak towards the oral and term-paper.

Oral: In the oral presentation, you have 8 min talk and 2 min Q & A session. Thus, you want to prepare ~6 slides. You will turn in your slides and I will show everyone’s slides. Thus you need to say “next please” to move to the next page.

Term paper: You will use the 3 printed page template and write your paper, which is the real format for the IEEE EDL (Electronb Device Letters).

Good luck. -TY

2/24 (Mon) HW5 uploaded, due on 3/2 (Mon). Tenplates for abs, slides, and term paper uploaded. I actually used this abstract for MRS (oral) and the paper for the IEEE EDS (published). They are all real. In order to be accepted for conferences or peer reviewed journals, it is critical to cite your previous papers whenever possible. -TY

2/19 (Wed) HW3 sol posted. Class note 06 posted. We have discussed cond e-, valence e-, and hole. Also discussed mobility. -TY

2/18 (Tue) HW4 and hints uploaded, due on 2/24 (Mon). -TY

2/12 (Wed) We have studied the E-k relation for Si, GaAs, and Ge. Class note 05 uploaded. 2/17 is Presidents' day and we have NO class. -TY

2/11 (Tue) HW2 sol posted. An email distributed to everyone for the Midterm and the final. -TY

2/10 (Mon) We have studied Bloch theorem, which is to explain what happens to a wave function if V(x+a) = V(x). HW3 uploaded, due on 2/17 (Mon). -TY

2/5 (Wed) We have stidied "parity" and "operator average" for 1D quantum well and traveling wave exp(ikx). Please review carefully for the traveling wave case since you need to use complex functions explicitly. -TY

2/3 (Mon) 1D quantum well has been further examined. HW2 posted. The deadline is extended to 2/10 ( Mon). -TY

1/30 (Thu) HW1 sol and HW2 due on 2/5 (Wed) uploaded. -TY

1/29 (Wed) We have studied the Schrodinger for a 1D quantum well case. Note 03 uploaded. -TY

1/29 (Wed) HW1 due on today. Please submit via email. -TY

1/27 (Mon) The double slit experiment has been discussed. This is the basis for electrons as waves in quantum. -TY

1/22 (Wed) We have studied zincblende = lattice of fcc, two basis, atom A at (o,o,o) and atom B at (1/4,1/4,1/4). HW1 due on 1/29 (Wed) and note 02 uploaded. -TY

1/17 (Sat) HW1 will be assigned next week. You will have a week before submitting via email (due a week after assignment). -TY

1/15 (Wed) We have examined the concept of lattice and basis. The next Monday1/20 is King's holiday and we will not meet. -TY

1/15 (Wed) Class Note 01 uploaded. -TY

1/15 (Wed) Syllamus 3 added. They are papers for optoelectronic devices using nanoholes, so that slow photons are introduced and photon absorption is enhanced. -TY

1/13 (Mon) We have studied metals, semicond, and insulators. The band gaps are zero, ~1 eV, and several eV, respectively. Only crystals can have energy bands, and this can be understood by quantum.  -TY

1/8 (Wed) We studied classical and quantum capacitances. Inverse permittivity should be a transfer function connecting the input D field and output E field. -TY

1/6 (Mon) We had an introduction today. Attachment can be found at the bottom of this page. You need your cruzID and blue massword. -TY 

   - The course video will be posted at https://webcast.ucsc.edu/.

   - The lecture notes will be posted every two weeks.

   - Quantum and energy bands are emphasized.





Fundamentals of Semiconductor Physics

Welcome to ECE227, Fundamentals of Semicond Physics, Winter 2020. In this course, quantum is emphasized, and how quntum concepts are used in science/engineering is studied in detail. We first want to develop a mental image and then moving into mathematics and compare with experiments. Mental image - mathematics - experiments is a big flow.

The following topics are often discussed in the literature. But in many cases, the connection to traditional Electromagnetism or other fields of Physics is not discussed. 


(1) Dielectric Constant (function) ε

Many books say it increases a capacitance value by ε when a dielectric is inserted. OK. If we have to consider ε for a metal, which value is the most appropriate? Quick answer: minus infinity. Why?

(2) E-field and D-field

If an electric field is applied to a material, it will be polarized, which is E and which is D? Quick answer: the input external field is D and the output field is E. The common sense is the other way around. What is going on?

(3) Quantum Capacitor

As a device, a capacitor has two terminals. Each terminal is connected to an electrode, and a pair of electrodes store positive and negative charges. But the new concept of quantum capacitor applies to a single conductor storing only one kind of charges. What does it mean?

(4) Energy Bands

In some textbooks, it is written, "the bottom of the conduction band is s-like, and the top of the valence band is p-like." Wait a minute. P-orbitals must be higher in energy than s-orbitals. What is going on? Quick answer: this is not a typo and is correct. There is a deep meaning for it. 

If you are like me, you may have spent a lot of time considering these subjects. The course will cover subjects that may be familiar to you, but there are often twists. We will re-examine various fundamentals and clear up annoying paradoxes. New concepts are also covered, such as Coulomb blockade, various tunneling, double layer capacitance, pseudocapacitance, etc.

Rather than concentrating on mathematics, we really want to understand what is going on in semiconductor materials and devices. If you have any questions, just send me an email at tyamada@soe.ucsc.edu.

You may look at T. Yamada, Chapter 7, "Nanoelectronics Applications" in Carbon Nanotubes: Science and Applications edited by M. Meyyappan, (CRC, Boca, Raton, 2004). But it was written ten years ago, and new topics such as quantum capacitor or kinetic inductor are not discussed. They will be surely covered in class. Syllabus is available in "Attached Files (Secure)" in the left column. Please check "Class Guide (Secure)" regularly, since all announcements are made in there.

***Important****Please click Class Guide (Secure) regularly with your BlueCruz ID, since all important communications are posted there. HWs and class notes are posted in Attachments, but again you need yourBlueCruz ID.


Toshishige Yamada, Ph.D. (EE)