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Heterojunction diodes and solar cells fabricated by sputtering of GaAs on single crystalline Si
Silvestre Bergés, Santiago; Boronat Moreiro, Alfredo
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies
This work reports fabrication details of heterojunction diodes and solar cells obtained by sputter deposition of amorphous GaAs on p-doped single crystalline Si. The effects of two additional process steps were investigated: A hydrofluoric acid (HF) etching treatment of the Si substrate prior to the GaAs sputter deposition and a subsequent annealing treatment of the complete layered system. A transmission electron microscopy (TEM) exploration of the interface reveals the formation of a few nanometer thick SiO2 interface layer and some crystallinity degree of the GaAs layer close to the interface. It was shown that an additional HF etching treatment of the Si substrate improves the short circuit current and degrades the open circuit voltage of the solar cells. Furthermore, an additional thermal annealing step was performed on some selected samples before and after the deposition of an indium tin oxide (ITO) film on top of the a-GaAs layer. It was found that the occurrence of surface related defects is reduced in case of a heat treatment performed after the deposition of the ITO layer, which also results in a reduction of the dark saturation current density and resistive losses.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Dispositius fotoelèctrics
Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica::Cèl·lules solars
Solar cells
Silicon diodes
gallium arsenide
solar cells
Cèl·lules solars
Díodes de silici
Attribution-NonCommercial-NoDerivs 3.0 Spain

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