Phase formation, morphology evolution and tunable bandgap of Sn 1-xSbxSe nanocrystals

Che Hsu Hu, Ming Hung Chiang, Ming Shiun Hsieh, Wen Tai Lin, Yaw Shyan Fu, Tzung Fang Guo

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

The phase formation, morphology evolution and bandgap of Sn 1-xSbxSe (0 ≤ x ≤ 0.6) nanocrystals synthesized at 230-275 °C for 5-36 h in a one-pot system were studied. Sn2+ is kinetically more reactive than Sb3+ toward Se2-. The SnSe(1) phase (JCPDS 01-075-6133) grew in the Sn1-xSbxSe (0 ≤ x ≤ 0.2) nanocrystals, while the SnSe(2) phase (JCPDS 32-1382) was dominant in the Sn1-xSbxSe (0.3 ≤ x ≤ 0.6) nanocrystals. In the present study, the substitution solubility of Sb in the SnSe lattice is about 10 at%. The introduction of more Sb in the Sn 1-xSbxSe (0.3 ≤ x ≤ 0.6) nanocrystals induced more defects therein and thus caused the phase transformation from SnSe(1) to SnSe(2). The SnSe nanocrystals grew as nanosheets, while the introduction of Sb enhanced the growth of Sn1-xSbxSe nanorods. The direct and indirect bandgaps of the Sn1-xSbxSe (0 ≤ x ≤ 0.2) nanocrystals could be tuned from 1.39 to 1.53 eV and 0.93 to 1.28 eV, respectively, by increasing the Sb concentration (x) from 0 to 0.2. The tunable morphology and bandgap of the Sn1-xSbxSe nanocrystals make them potential candidates as photovoltaic materials.

原文English
頁(從 - 到)1786-1792
頁數7
期刊CrystEngComm
16
發行號9
DOIs
出版狀態Published - 2014 一月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學

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