指導老師:余英松 老師
組員:蔡範錡 498L0028
陳雁卿 498L0039
吳建霆 498L0041
潘藝勻 498L0042
蔡伯聰 498L0098
Foreword
Introduction
of solar watch
Encounter problems
Conclusion
Solar energy is a major green energy industry
of this generation. Sunlight is everywhere. If
we can applied solar in all daily needs
effectively, this will bring great impact for the
Earth's environment.
Time is money. The watch has become the
general accessory of the modern people. And
what we want to introduce is the first analog
watch of a solar-powered.
1
Foreword
Introduction
of solar watch
Encounter problems
Conclusion

The solar watch converts light energy into
electrical energy and then the excess energy
stores in the secondary battery, replace
mercury batteries, so we do not have to
exchange batteries frequently.
Good!!!
Bad…
2
1.Light breaks silicon substrate
and separates electrons and
holes.
2. positive charges diffuse to
P-type；negative charge
diffuse to N-type.
3.It will make a Built-in
field when attaching extra
load.
3
4
Cross sectional diagram of a new energy watch of solar cell
5
Schematic of a ”transparent” solar cell. Cross section of the cell
6
The configuration example of improving the color and appearance
7
8
Advantage ： high absorption Optical、low cost、
thinner thickness
Shortcomings：making defect easily
9
Photogenerated power by a－Si solar cell
10
Illuminance change on a watch
11
Foreword
Introduction
of solar watch
Encounter problems
Conclusion
In 1970-
Single-crystalline silicon solar cells can make watch operation,
but battery life of only five years. So after using amorphous
silicon solar cells with electric double layer capacitor, not only
increase accuracy, but also battery life improve.
12
In 1986-
Combination of lithium ion secondary battery with silicon solar
panels. So that the whole system as well as the battery life to the
highest state. Charge up to run for 600 hours
13

Now-
Fully charged after four years of continuous operation (powersaving mode), 10 atmospheric pressure waterproof.
※ The wave form a built-in an extremely precise wave receiver
(antenna). It can receive the radio from Japan station everyday,
and correct time and calendar Automatically. 10 million years only
one second error.
14
Foreword
Introduction
of solar watch
Encounter problems
Conclusion
Environmental protection
15
According to statistics, the worldwide production of about 1.5
billions watches every year, 90% of which use mercury batteries
quartz watch. A watch maker in Japan for three years, consuming a
total of 7.2 millions mercury batteries, If it stack up…
16
Mercury pollution in China
17
A devastating
we won’t
expect…
Give me aearth
wonderful
earth~~
We want live longer~~!!!!
18
【1】 Eco-Drive-Watch；CITIZEN Watch
corporation Rights
【2 】中山大學物理所-太陽能實驗
http://www2.nsysu.edu.tw/physdemo/E4/
E4.htm
19