Author/Authors :
Veluchamy، نويسنده , , P. and Tsuji، نويسنده , , M. and Nishio، نويسنده , , T. and Aramoto، نويسنده , , T. and Higuchi، نويسنده , , H. and Kumazawa، نويسنده , , S. and Shibutani، نويسنده , , S. and Nakajima، نويسنده , , J. and Arita، نويسنده , , T. and Ohyama، نويسنده , , H. and Hanafusa، نويسنده , , A. and Hibino، نويسنده , , T. and Omura، نويسنده , , K.، نويسنده ,
Abstract :
Highly transparent, low-resistance SnO2:F films suitable as a substrate material for thin-film CdS/CdTe solar cells have been developed on 10×10, 30×60 and 82×71 cm2 glass substrates by an ultrasonic spray pyrolysis (pyrosol) process. Dimethyltin dichloride, NH4F and HF dissolved in water served as the source solution. A fine spray of the source solution has been transported using air as a carrier gas onto hot glass plates in a belt furnace maintained at 500–530°C. A very high growth rate of >15 nm/s and a high throughput of 3 min/glass plate (82×71 cm2 size) have been achieved with films showing greater uniformity, low sheet resistance and high optical transmission. Typical films exhibited a thickness of 500 nm, a sheet resistance of 8.1 Ω/sq., a mobility of 43.8 cm2/V s and a donor concentration of 3.5×1020 cm−3. A thin-film CdS/CdTe solar cell fabricated on a 30×60 cm2 SnO2:F transparent conducting substrate exhibited a solar energy conversion efficiency maximum of 14.95% for 1 cm2 cell and an average efficiency of 14.24% for 178 isolated 1 cm2 cells.
Keywords :
Transparent conducting oxide films , Pyrosol technique , CdS/CdTe solar cell , Dimethyl tin dichloride , SnO2
