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: : 498L0028 498L0039 498L0041 498L0042 498L0098

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Foreword Introduction of solar watch Encounter problems Conclusion

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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

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Foreword Introduction of solar watch Encounter problems Conclusion

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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

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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

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Schematic of a transparent solar cell. Cross section of the cell 6

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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

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Photogenerated power by a Si solar cell 10

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Illuminance change on a watch 11

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Foreword Introduction of solar watch Encounter problems Conclusion

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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

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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

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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

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Foreword Introduction of solar watch Encounter problems Conclusion

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Environmental protection 15

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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

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Mercury pollution in China 17

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Give me a wonderful earth~~ A devastating earth we wont expect We want live longer~~!!!! 18

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1 Eco-Drive-Watch CITIZEN Watch corporation Rights 2 - http://www2.nsysu.edu.tw/physdemo/E4/ E4.htm 19

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