Yang, Silicon Materials Used For Solar Cells

Silicon Materials Materials Used Used for for Silicon Solar Cells Cells Solar Deren Yang State Key Laboratory of Silicon Materials Zhejiang University, China Erice, Sept.18, 2007

Deren Yang

Outline Outline State key lab of silicon PV and Silicon industry Research of silicon

Erice, Sept.18, 2007

Deren Yang

State key key lab lab of of silicon silicon State Hangzhou

Beijing Beijing

Shanghai Shanghai

Hangzhou Hangzhou

Erice, Sept.18, 2007

Deren Yang

Hangzhou Capital of Zhejiang Province Human-being: 7000 year City: 2000 years Capital city: 800 years 3,000,000 population West Lake

Erice, Sept.18, 2007

Deren Yang

Zhejiang University Built in 1897 (one of oldest) One of top 5 university Five campus 22 colleges, 60 departments Nearly 40,000 students

Erice, Sept.18, 2007

Deren Yang

State key lab of Silicon Materials Zhejiang University    

1954

Cz silicon used for IC, specially nitrogen-doped CZ silicon Silicon used for solar cells Nanowire silicon Silicon based opto-electronic materials

Erice, Sept.18, 2007

Deren Yang

Erice, Sept.18, 2007

Deren Yang

Sol ar Cel l s( MW)

PV and and Si Si in in China China PV 1000 900 800 700 600 500 400 300 200 100 0 1998



2000

2002

2004

2006

Year

In 2001, 4 MW solar cells and about 1% share of world.

 In 2008, ~2580 MW solar cells, ~4000 MW capability

~32% share of the world Erice, Sept.18, 2007

Deren Yang

Polycrystalline silicon 4000 3500 Ton（t ）

3000 2500 2000 1500 1000 500 0 1996

1998

2000

2002

2004

2006

2008

Year

 In 2002, 75 tons  In 2008, ~4500 tons Erice, Sept.18, 2007

Deren Yang

Polycrystalline Si Si Polycrystalline

Line In building Planning

 Capbility: ~ 100,000 t Erice, Sept.18, 2007

Deren Yang

Yield of Silicon for PV 2008, ~24,000

6000

Si l i con（t ）

5000

 CZ-Si: ~12,000  mc-Si: ～ 12,000

4000 3000 2000 1000 0 1996

1998

2000

2002

2004

2006

Year

Erice, Sept.18, 2007

Deren Yang

Silicon Research Research Silicon  

Crystal growth (CZ and multicrystalle-Si) Defect and impurity (dislocation, grain boundary,oxygen, carbon, metals…)



Defect and impurity engineering (nitrogen-doping, germanium doping)



materials issues during solar cell process (gettering,passivation…)

 Up-grade metallurgical silicon  …. Erice, Sept.18, 2007

Deren Yang

Oxygen and carbon in mc-Si

Solar Energy Material and Solar Cells, Vol.62, 37 Solid State Phenomena, Vol. 82, 2002, P.707-712 Solar Energy Materials and Solar Cells, Vol.72, 541 Erice, Sept.18, 2007

Solar Energy Materials and Solar Cells, Vol.72, 133

Deren Yang

Aluminum in mc-Si

with Al layer

without Al layer

Eur. Phys. J. Appl. Phys.27, . 119-122

Erice, Sept.18, 2007

Deren Yang

New complex in mc-Si

Physica B 344, 1-4

Erice, Sept.18, 2007

Deren Yang

Metal precipitation in mc-Si

Applied physics Letters, Vol.83,No.15, .3048-3050 Physica B 344.407-412 Semicond . Sci.Technol.19 ,299-305 Erice, Sept.18, 2007

Deren Yang

Texturization in mc-Si

Renevable Energy 29 ,2101-2107 Solar Energy Materials&Solar Cells 77, 255-263 Semicond. Sci.Technol.19, 485-48

Erice, Sept.18, 2007

Deren Yang

Grain boundary in mc-Si

J. Phys.: Condens. Matter 16 , S211S216. J. Appl. Phys. 96 , 5490-5495. J. Appl. Phys. 97 , 033701.

Erice, Sept.18, 2007

Deren Yang

Summary Summary 

PV and silicon industry is developing very fast in China.



Czochralski, multicrystalline and up-grade metallurgical silicon have been investigated.



Growth, defect and impuries during crsyal growth and solar cell process has been focused.

Erice, Sept.18, 2007

Deren Yang

Thank you! Erice, Sept.18, 2007

Deren Yang