Schematic Representation of Dye-Sensitized Solar Cells

1. Dye-Sensitised Solar Cells Energy Level Representation Michael Seery

2. DSSC: Energy Levels Representation LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

3. 1: Incident light results in excited state dye D* D  D* DSSC: Energy Levels Representation 1 LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

4. 1: Incident light results in excited state dye D* D  D* DSSC: Energy Levels Representation 2: Electron transfer from D* to CB D*  D + + e - LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red 2

5. 3,4: Electron passes through circuit e - (WE)  e- (CE) + electricity 4 2: Electron transfer from D* to CB D*  D + + e - 1: Incident light results in excited state dye D* D  D* LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

6. 5: Reductor is regenerated Ox + e -  Red 3,4: Electron passes through circuit e - (WE)  e- (CE) + electricity 2: Electron transfer from D* to CB D*  D + + e - 1: Incident light results in excited state dye D* D  D* LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red 5

7. 6: Dye is regenerated Red + D +  Ox + D RESULT h   electricity 5: Reductor is regenerated Ox + e -  Red 3,4: Electron passes through circuit e - (WE)  e- (CE) + electricity 2: Electron transfer from D* to CB D*  D + + e - 1: Incident light results in excited state dye D* D  D* LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red 6

8. D + h   D* D*  D + + e - e - (WE)  e- (CE) + electricity Ox + e -  Red Red + D +  Ox + D ________________________ h   electricity Summary Think about where there may be sources of inefficiency

9. Efficiency LHE Light Harvesting Efficiency LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

10. Efficiency  inj Electron Injection Efficiency LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

11. Efficiency  c Charge Collection Efficiency LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red

12. Efficiency Incident Photon to Current Efficiency IPCE (  )  LHE (  ) x  inj x  c LOAD Semiconductor Adsorbed Dye Electrolyte Transparent coated electrode Platinized Transparent coated electrode D* D/D + VB CB Ox/Red