AgGaTe2 layers were prepared on Si substrates by a closed space sublimation method using a mixed powder source of Ag2Te and Ga2Te3. Ag2Te buffer layer deposition was introduced to eliminate melt-back etching. The effect of the molar ratio of Ag2Te and Ga2Te3 in the mixed source on the crystallinity of the AgGaTe2 layer was investigated. The composition and the phase of the layer was found to change depending on the molar ratio in the deposits, which could be controlled by the source molar ratio along with the Ag2Te buffer layer thickness. It was confirmed that (112) oriented uniform AgGaTe2 layer with an abrupt interface between AgGaTe2 and Si was formed after those parameters were tuned. The obtained layer exhibited the acceptor concentration of around 2.5 × 1016 cm−3. A solar cell was fabricated using the p-AgGaTe2/n-Si heterojunction, and exhibited a conversion efficiency of 1.15%.
|ジャーナル||Physica Status Solidi (A) Applications and Materials Science|
|出版ステータス||Published - 2017 1 1|
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