Advances in Evaporated Solid-Phase-Crystallized Poly-Si Thin-Film Solar Cells on Glass (EVA)

Table 6

Parameters that were used to model solar cells (A–C) with PC1D before and after deposition of a white paint back reflector. In the latter case, the back surface reflectance was chosen to be diffuse rather than specular as in the nonpainted case.

		Without paint			With paint
Parameter	Unit	A	B	C	A	B	C
Emitter thickness	(nm)	330	210	230	330	210	230
Emitter doping density	(cm^−3)	5×10^19	5×10^19	5×10^19	5×10^19	5×10^19	5×10^19
Emitter diffusion length	(nm)	146	90	110	146	90	110
Base thickness	(nm)	1900	2000	2000	1900	2000	2000
Base doping density	(cm^−3)	5×10^15	1.6×10^16	3×10^16	5×10^15	1.6×10^16	3×10^16
Base diffusion length	(𝜇m)	4	1.55	1.1	5	1.55	1.25
Base minority carrier lifetime	(ns)	5.2	0.9	0.51	8.1	0.9	0.66
BSF thickness	(nm)	100	100	100	100	100	100
BSF doping density	(cm^−3)	1×10^19	1×10^19	1×10^19	1×10^19	1×10^19	1×10^19
BSF diffusion length	(nm)	50	50	50	50	50	50
Ext. reflectance layer 1: thickness; 𝑛	(nm)	10^6;1	10^6;1	10^6;1	10^6;1	10^6;1	10^6;1
Ext. reflectance layer 2: thickness, 𝑛	(nm)	10^6;1.48	10^6;1.48	10^6;1.48	10^6;1.48	10^6;1.48	10^6;1.48
Ext. reflectance layer 3: thickness, 𝑛	(nm)	71; 1.90	68; 1.95	68; 1.93	71; 1.90	68; 1.95	68; 1.93
Int. front surface reflectance	(%)	5	5	5	15	15	15
Int. back surface reflectance	(%)	28 (spec.)	28 (spec.)	30 (spec.)	70 (diff.)	70 (diff.)	70 (diff.)