University:
Swansea University
Course:
EGA109 | Introductory Organic Chemistry
Academic year:

2023
Views:

33

Pages:

2
Author:

Sanjeev K

Efficiency levels relatively low (14~257) compared to efficiency levels of other reneivable energy systems. PEC Cells Photocurrent generated device made up of an electrolyte cy a photoactive semiconductor clectrode Device in which a photoactive semic. material is in contact with electrolyte. • Irradiation of SE/ electrolyte function cwith laight of energy ergy 7 7 Eg, Eg, band gap of SC, prodivus e-hole pairs. e-hole pairs ane spatially seperated Caue to ict-pitential) to drive oxidation Cy reduction reactions in the system. Types 1. Liquid Jet Sc n-SC/Electrolyte/Metal 4. tree is in sc absorb the high energy radiation ay chen the excited és will move from the valence band is conduction band of SC. As a result, holes are created. Used to convert solar dectrical. 2. PES solare to chemicalt in form of fuels Advantages of PEC over pv. Gaby jct formation (enene dipping of sc electrode in electrolyte). In-situ suater electrolysis possible. • Efficiencies of poly crystalline bulky thin film electrodes are comparable lithox of single crystal electrodes. 4 Novel ren products are posible cy catalytic effects (photo catalysis) can be induced on sc surfaces Particulate systems can be used. Conditions for Efficient Solar Energy Conversion-Electrodes 1. Band gap (Eg) should be optimum. 2. Doping level should be optimum, so that there will be a good spatial seperation of the phrotieng. generated carriers and hence, high quantine off. 3. Should have large values this of absorption coefficient (2). is usually found for dired band gap 4. Applied bias (external benergy source) makes the ap se's. efficent