Photolithography Experiment - Student

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* 1. Please identify the school at which you performed the Photolithography experiment:

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* 2. In what grade are you currently enrolled?

8th grade or younger

9th

10th

11th

12th

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* 3. After performing this hands-on activity, please rate how well you understand the following concepts:

	Not at all	A little	Mostly	Very
Light is a spectrum having properties that are characterized by its wavelength. With shorter wavelengths, ultraviolet (UV) has sufficiently higher energy to be utilized to modify molecular structures of materials.	Light is a spectrum having properties that are characterized by its wavelength. With shorter wavelengths, ultraviolet (UV) has sufficiently higher energy to be utilized to modify molecular structures of materials. Not at all	Light is a spectrum having properties that are characterized by its wavelength. With shorter wavelengths, ultraviolet (UV) has sufficiently higher energy to be utilized to modify molecular structures of materials. A little	Light is a spectrum having properties that are characterized by its wavelength. With shorter wavelengths, ultraviolet (UV) has sufficiently higher energy to be utilized to modify molecular structures of materials. Mostly	Light is a spectrum having properties that are characterized by its wavelength. With shorter wavelengths, ultraviolet (UV) has sufficiently higher energy to be utilized to modify molecular structures of materials. Very
Materials have significant solubility variation depending on even small molecular bonding differences.	Materials have significant solubility variation depending on even small molecular bonding differences. Not at all	Materials have significant solubility variation depending on even small molecular bonding differences. A little	Materials have significant solubility variation depending on even small molecular bonding differences. Mostly	Materials have significant solubility variation depending on even small molecular bonding differences. Very
Photolithography is a key tool that enables engineers to make billions of transistors on a single 2 cm x 2 cm computer chip.	Photolithography is a key tool that enables engineers to make billions of transistors on a single 2 cm x 2 cm computer chip. Not at all	Photolithography is a key tool that enables engineers to make billions of transistors on a single 2 cm x 2 cm computer chip. A little	Photolithography is a key tool that enables engineers to make billions of transistors on a single 2 cm x 2 cm computer chip. Mostly	Photolithography is a key tool that enables engineers to make billions of transistors on a single 2 cm x 2 cm computer chip. Very

Please offer your explanation to the following four questions:

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* 4. There are a great number of benefits for designing and making products small, such as you did in this experiment: using less material, making more devices per area, yielding new functions, etc. As scientists and engineers, you must also recognize the compromises of fabricating small devices. Name at least two compromises/disadvantages when engineering small stuff:

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* 5. What is the purpose of the hot bath of ferric chloride in this experiment (bonus: name the chemical reaction)?

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* 6. Ultraviolet light (UV) was used to make a portion of the photoresist soluble, so only your designed metal line patterns remain after soaking in the developer. Explain how UV affects photoresist to make it soluble:

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* 7. Old-fashioned (non-digital) photography produces photographs similar to the photolithography process. Photographers go into a “yellow-room” to develop the photoresists on the photograph films, or negatives. Provide a reason why photographers will only use yellow light to see when developing the negatives?

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* 8. Identify any concepts that you might have better understood after performing this activity:

None

Microfabrication

Resistance

Wavelength

Oxidation-Reduction

Other (please specify)

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* 9. On a scale from 1 to 4, where 1 means not at all and 4 means very much, rate the following:

	Not at all	A little	Some	Very Much
Did you find the science you learned in this activity interesting?	Did you find the science you learned in this activity interesting? Not at all	Did you find the science you learned in this activity interesting? A little	Did you find the science you learned in this activity interesting? Some	Did you find the science you learned in this activity interesting? Very Much
Do you want to learn more about how to modify material properties?	Do you want to learn more about how to modify material properties? Not at all	Do you want to learn more about how to modify material properties? A little	Do you want to learn more about how to modify material properties? Some	Do you want to learn more about how to modify material properties? Very Much
How well can you explain the process of fabricating small “stuff” using light to someone who doesn’t know (perhaps a younger sibling)?	How well can you explain the process of fabricating small “stuff” using light to someone who doesn’t know (perhaps a younger sibling)? Not at all	How well can you explain the process of fabricating small “stuff” using light to someone who doesn’t know (perhaps a younger sibling)? A little	How well can you explain the process of fabricating small “stuff” using light to someone who doesn’t know (perhaps a younger sibling)? Some	How well can you explain the process of fabricating small “stuff” using light to someone who doesn’t know (perhaps a younger sibling)? Very Much