Small description of solar energy materials and its basic operating principles.

1. Solar Energy Materials And Its
Operations
By
Anish Das
Roll no. -14MS60R16
MATERIALS SCIENCE CENTRE
Indian Institute of Technology
KHARAGPUR, 721302 - INDIA
JANUARY, 2015
107:30:08 PM

2. Overview
 What is solar energy material
 How energy conversion occurs
 Solar radiation spectrum reaching to the
Earth
 Absorption coefficient and thickness
 Operating principle of solar cell
 I-V characteristics of solar cell 207:30:08 PM

3. What is solar energy material?
Solar energy materials are
those where solar energy is made to
absorb and convert to electrical
energy or current
307:30:08 PM

4. How solar energy is converted
into current
Solar radiation
Material
Electron-hole pairs generation
Electron-hole pairs separation
Voltage created 407:30:08 PM

5. Solar radiation spectrum
reaching to the earth
46% visible and 49% N-IR. So choose a material of such
band gap that will be able to absorb in this region. 507:30:08 PM

6. Absorption coefficient and
thickness of material
607:30:08 PM

7. Continued
707:30:08 PM

8. Examples of some basic solar
cell materials
807:30:08 PM

9. Continued
907:30:08 PM

10. Continued
Some other materials are
CdTe(with n-ZnS),CIGS(with n-ZnS)
CZTS(with n-ZnS). All can be used
as thin film solar cell material.
1007:30:09 PM

11. Operating principle of solar cell
First step : Choose a proper material
considering
Thickness of material
Optimum band gap
Minority carriers life time
1107:30:08 PM

12. Continued
1207:30:08 PM

13. Continued
1307:30:08 PM

14. Continued
Fourth step : when electrons and
holes are separated then driven those
electrons out through metal
electrodes (which remains in ohmic
contact)
1407:30:08 PM

15. I-V characteristics of solar cell
1507:30:08 PM

16. Continued
1607:30:08 PM

17. Expression of current in solar
cell
1707:30:08 PM

18. The EndThe End
1807:30:08 PM

19. Any question ?Any question ?
1907:30:08 PM