NANOSYSTEMS PRINCIPLES (Fall Semester 2012)

Homework #4

Due at the class time on November 20, 2012

Total points: 40

Nanoenergy

1. Define and discuss voltage, capacity, and specific capacity as they relate to a battery. (6) Lecture 19 – Nanoenergy I, slides 5-7, 9-11,

2. Discuss the electrochemistry behind Li-ion battery. (6) Refer to Lecture 19 – Nanoenergy. There are many varieties, any discussion would be fine.

3. Find the specific capacity of Li2O2. (5) Lecture 19 – Nanoenergy I, (also refer to the announcement-oncourse on Nov 19)

4. With the help of a neatly drawn diagram, describe the operation of a PEM fuel cell. (8) Lecture 19-nanoenergy ii, slides 11-12

5. With the help of pn junction and band diagrams explain photovoltaic effect.(5) Lecture 20, Nannoenergy – solar.. slide 24

6. Define the following terminologies as they relate to photovoltaic cells: Short circuit current, open circuit voltage, fill factor, efficiency, single-crystal, poly-crystalline and amorphous silicon, thin film solar cell, homo and hetero-junction solar cells, single and multi-junction solar cells, TCO, window layer. (10) Refer to Lecture 20 – Thin film solar cells overview