Current matching part 1 PVMD Arno Smets Delft University of Technology
Learning objectives • The what, how and why of current matching • Influence of material properties • The versatility of silicon oxide
Micromorph solar cell 16 Bottom 14 Glass Top Tandem cell 12 J (mA/cm 2 ) 10 TCO 8 11.6 6 250 nm a-Si:H [mA·cm -2 ] max 4 2 4 μ m 15.8 0 μc -Si:H 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 max [mA·cm -2 ] Voltage (V) 2 n n 1 2 R 0 n n 1 2
Micromorph solar cell 16 Bottom 14 Top Tandem cell Glass 12 J (mA/cm 2 ) 10 TCO 8 11.6 6 250 nm a-Si:H [mA·cm -2 ] max 4 Metal 2 4 μ m 15.8 0 μc -Si:H 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 max [mA·cm -2 ] Voltage (V) 2 n n 1 2 R 0 n n 1 2
IRL refractive index 1.0 1.0 1.0 1.0 1.0 No IRL n=2.05 n=1.95 n=1.75 Top cell 0.9 0.9 0.9 0.9 0.9 11.6 12.8 13.1 13.6 Bottom cell Current 0.8 0.8 0.8 0.8 0.8 [mA·cm -2 ] No IRL 15.8 14.3 13.9 13.2 0.7 0.7 0.7 0.7 0.7 n=2.05 0.6 0.6 0.6 0.6 0.6 EQE 0.5 0.5 0.5 0.5 0.5 0.4 0.4 0.4 0.4 0.4 n=1.95 0.3 0.3 0.3 0.3 0.3 n=1.75 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 400 500 600 700 800 900 1000 1100 350 350 350 350 450 450 450 450 550 550 550 550 650 650 650 650 750 750 750 750 850 850 850 850 950 950 950 950 1050 1050 1050 1050 Wavelength [nm] M. Boccard et al, IEEE Journal of Photovoltaics, Vol. 4, No. 6, 1368-1373, (2014) EPFL
IRL thickness 1.0 1.0 1.0 1.0 1.0 No IRL 40 nm 62 nm 95 nm 0.9 0.9 0.9 0.9 0.9 Top cell 11.1 11.5 11.8 12.1 Current 0.8 0.8 0.8 0.8 0.8 [mA·cm -2 ] Bottom cell No IRL 13.7 13.0 12.5 12.2 0.7 0.7 0.7 0.7 0.7 40 nm 0.6 0.6 0.6 0.6 0.6 EQE 0.5 0.5 0.5 0.5 0.5 0.4 0.4 0.4 0.4 0.4 62 nm 0.3 0.3 0.3 0.3 0.3 95 nm 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 400 500 600 700 800 900 1000 1100 300 300 300 300 400 400 400 400 500 500 500 500 600 600 600 600 700 700 700 700 800 800 800 800 900 900 900 900 1000 1000 1000 1000 1100 1100 1100 1100 Wavelength [nm] P. Buehlmann et al, APL 91, 143505 (2007) University of Neuchatel
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