https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn en-us 2021-03-08 04:15:36 UTC 2021-04-25 15:44:56 UTC hello@padlet.com pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1280258611 “Solar Photovoltaic Cell Basics.” Energy.gov, U.S. Department of Energy, www.energy.gov/eere/solar/solar-photovoltaic-cell-basics.]]> 2021-03-08 04:29:18 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1280258611 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1280259021 - Personal engagement
- Background information
     Source 1. bandgap of PV cells, different types of photovoltaic cells
     Source 2. how PV cells work - converts light into electricity through the photovoltaic effect. Silicon is a giant network covalent solid where one atom forms 4 bonds with surrounding silicon atoms, this structure is non-conductive. In a PV cell, there are two layers of silicon, a N-type silicon and a P-type silicon. The N-type silicon contains phosphorus atoms with 5 valence electrons, thus, there are delocalized electrons that is mobile. The P-type silicon contains boron with 3 valence electrons, indicating that there is 1 electron “hole” for every boron atom. As the layers are stacked on top of each other, a depletion region is created when electrons from N-side moves to the P-side, and there are no delocalized electron in this region. Finally, an electric field is created when the N-side becomes positively charged and the P-side becomes negatively charged.]]> 2021-03-08 04:29:30 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1280259021 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430215138 Wikipedia Contributors. “Solar Cell.” Wikipedia, Wikimedia Foundation, 10 Mar. 2019, en.wikipedia.org/wiki/Solar_cell.]]> 2021-04-18 16:52:54 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430215138 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430217978 Afework, Bethel, et al. “Solar Cell Efficiency.” Energy Education, University of Calgary, 8 June 2015, energyeducation.ca/encyclopedia/Solar_cell_efficiency.]]> 2021-04-18 16:54:32 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430217978 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430218201 Yu, H. A., et al. “The Spectro‐Photovoltaic Characteristics of a Carbonaceous Film/N‐Type Silicon (C/N‐Si) Photovoltaic Cell.” Applied Physics Letters, vol. 69, no. 26, 23 Dec. 1996, pp. 4078–4080, doi.org/10.1063/1.117824, 10.1063/1.117824. Accessed 18 Apr. 2021.]]> 2021-04-18 16:54:41 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430218201 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430221817 Source 3. Hypothesis
     - based on other scientific research
     - depends on the type of cell
     - different wavelengths have different energy
- Variables
     - Independent variable
          - wavelength: controlled by changing the color of lamp and looking at the RGB light percentage
     - Dependent variable
          - current of the PV cell
     - Controlled variables
          - temperature
          - type of PV cell
          - light intensity
          - distance from light source to PV cell
          - conducting the experiment in a dark room
Source 4. 
Band gap energy of silicon is normally 1.12 eV which is less than the energy from visible light and UV. Photons with less energy would not be absorbed and photons with too much energy would be transformed into heat instead of useful energy.]]> 2021-04-18 16:57:01 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1430221817 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433747119 no experimental data yet]]> 2021-04-19 15:47:08 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433747119 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433755877 no experimental data yet]]> 2021-04-19 15:48:46 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433755877 pinnjirachaya https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433867708 no experimental data yet
- % uncertainty, % error
- validity and reliability of data
- comparison to literature value]]> 2021-04-19 16:09:32 UTC https://padlet.com/pinnjirachaya/imsyz0op4ek1idrn/wish/1433867708