Journal Article Boron-doped p-BaSi 2/n-Si solar cells formed on textured n-Si(001) with a pyramid structure consisting of {111} facets

Deng, Tianguo  ,  Gotoh, Kazuhiro  ,  Takabe, Ryota  ,  Xu, Zhihao  ,  Yachi, Suguru  ,  Yamashita, Yudai  ,  Toko, Kaoru  ,  Usami, Noritaka  ,  Suemasu, Takashi

475pp.186 - 191 , 2017-10 , Elsevier
BaSi2 films were fabricated on textured Si(0 0 1) substrates that consisted of {1 1 1} facets using molecular beam epitaxy. The light-trapping effect of these films and their performance when incorporated into solar cells were measured. X-ray diffraction and reflectivity measurements showed that the BaSi2 films were grown epitaxially on the textured Si(0 0 1) substrate and confirmed the light-trapping effect. The critical thickness over which BaSi2 relaxes increased from approximately 50 to 100 nm when comparing the BaSi2 films on a flat Si(1 1 1) substrate and the textured substrate, respectively. p-BaSi2/n-Si solar cells were fabricated with varying BaSi2 layer thickness and with hole concentrations in the range between 2.0 × 1018 and 4.6 × 1018 cm−3. These cells exhibited a maximum energy conversion efficiency of 4.62% with an open-circuit voltage of 0.30 V and a short-circuit current density of 27.6 mA/cm2 when the p-BaSi2 layer was 75 nm-thick. These results indicated that the use of BaSi2 films on textured Si(0 0 1) substrates in solar cells shows great promise.

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