Simple Low-Cost Technology of Silicon Solar Cells and PV Modules Fabrication

摘要

Solar cells (SC) fabricated on the basis of semiconductor-insulator-semiconductor (SIS) structures are obtained by spraying deposition of ITO layers on a Si surface. Films with conductivity 4.7·10~3Ohm~(-1)cm~(-1) and the transmission coefficient of 87% in the visible range of the spectrum were obtained from solutions containing 90% lnCl_3 and 10% SnCl_4 at the substrate temperature ～ 450 ℃. For SIS structures fabrication nSi wafers oriented in the (100) plane with the concentration ～10~(15)cm~(-3)-10~(16)cm~(-3) were used as substrate. A back surface field (BSF) region has been fabricated at the rear contact. The efficiency of 10.11% was obtained for solar cells with active area of 24cm~2 in AM 1.5 conditions.rnThese structures containing only isotype junctions are very promising, as it is not necessary to obtain a p-n junction. Their advantages are the following: the frontal junction is obtained with a simple spray technique at low temperatures; the double diffusion process is not necessary; the frontal ITO layer is both the collecting electrode and antireflection coating.