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

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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

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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 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 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 (power- saving 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

Give me a wonderful earth~~ A devastating earth we won’t expect… 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 E4.htm 19